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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.solr.handler;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.lang.invoke.MethodHandles;
import java.net.URI;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.StandardCharsets;
import java.nio.file.NoSuchFileException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Properties;
import java.util.Random;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.locks.ReentrantLock;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.zip.Adler32;
import java.util.zip.Checksum;
import java.util.zip.DeflaterOutputStream;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.output.CloseShieldOutputStream;
import org.apache.lucene.codecs.CodecUtil;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexCommit;
import org.apache.lucene.index.IndexDeletionPolicy;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.SegmentCommitInfo;
import org.apache.lucene.index.SegmentInfos;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.IOContext;
import org.apache.lucene.store.IndexInput;
import org.apache.lucene.store.RateLimiter;
import org.apache.lucene.util.Version;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.SolrException.ErrorCode;
import org.apache.solr.common.params.CommonParams;
import org.apache.solr.common.params.CoreAdminParams;
import org.apache.solr.common.params.ModifiableSolrParams;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.common.util.ExecutorUtil;
import org.apache.solr.common.util.FastOutputStream;
import org.apache.solr.common.util.NamedList;
import org.apache.solr.common.util.SimpleOrderedMap;
import org.apache.solr.common.util.StrUtils;
import org.apache.solr.common.util.SuppressForbidden;
import org.apache.solr.core.CloseHook;
import org.apache.solr.core.CoreContainer;
import org.apache.solr.core.DirectoryFactory.DirContext;
import org.apache.solr.core.IndexDeletionPolicyWrapper;
import org.apache.solr.core.SolrCore;
import org.apache.solr.core.SolrDeletionPolicy;
import org.apache.solr.core.SolrEventListener;
import org.apache.solr.core.backup.repository.BackupRepository;
import org.apache.solr.core.backup.repository.LocalFileSystemRepository;
import org.apache.solr.handler.IndexFetcher.IndexFetchResult;
import org.apache.solr.metrics.MetricsMap;
import org.apache.solr.metrics.SolrMetricsContext;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.response.SolrQueryResponse;
import org.apache.solr.search.SolrIndexSearcher;
import org.apache.solr.update.CdcrUpdateLog;
import org.apache.solr.update.SolrIndexWriter;
import org.apache.solr.update.VersionInfo;
import org.apache.solr.util.DefaultSolrThreadFactory;
import org.apache.solr.util.NumberUtils;
import org.apache.solr.util.PropertiesInputStream;
import org.apache.solr.util.RefCounted;
import org.apache.solr.util.plugin.SolrCoreAware;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.MDC;
import static org.apache.solr.common.params.CommonParams.NAME;
import static org.apache.solr.core.XmlConfigFile.assertWarnOrFail;
/**
* A Handler which provides a REST API for replication and serves replication requests from Slaves.
* When running on the master, it provides the following commands
Get the current replicable index version
* (command=indexversion) Get the list of files for a given index version
* (command=filelist&indexversion=<VERSION>) Get full or a part (chunk) of a given index or a config
* file (command=filecontent&file=<FILE_NAME>) You can optionally specify an offset and length to get that
* chunk of the file. You can request a configuration file by using "cf" parameter instead of the "file" parameter.
* Get status/statistics (command=details) When running on the slave, it provides the following
* commands
Perform an index fetch now (command=snappull) Get status/statistics (command=details)
* Abort an index fetch (command=abort) Enable/Disable polling the master for new versions (command=enablepoll
* or command=disablepoll)
*
*
* @since solr 1.4
*/
public class ReplicationHandler extends RequestHandlerBase implements SolrCoreAware {
public static final String PATH = "/replication";
private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
SolrCore core;
private volatile boolean closed = false;
private static final class CommitVersionInfo {
public final long version;
public final long generation;
private CommitVersionInfo(long g, long v) {
generation = g;
version = v;
}
/**
* builds a CommitVersionInfo data for the specified IndexCommit.
* Will never be null, ut version and generation may be zero if
* there are problems extracting them from the commit data
*/
public static CommitVersionInfo build(IndexCommit commit) {
long generation = commit.getGeneration();
long version = 0;
try {
final Map commitData = commit.getUserData();
String commitTime = commitData.get(SolrIndexWriter.COMMIT_TIME_MSEC_KEY);
if (commitTime != null) {
try {
version = Long.parseLong(commitTime);
} catch (NumberFormatException e) {
log.warn("Version in commitData was not formatted correctly: " + commitTime, e);
}
}
} catch (IOException e) {
log.warn("Unable to get version from commitData, commit: " + commit, e);
}
return new CommitVersionInfo(generation, version);
}
public String toString() {
return "generation=" + generation + ",version=" + version;
}
}
private IndexFetcher pollingIndexFetcher;
private ReentrantLock indexFetchLock = new ReentrantLock();
private ExecutorService restoreExecutor = ExecutorUtil.newMDCAwareSingleThreadExecutor(
new DefaultSolrThreadFactory("restoreExecutor"));
private volatile Future restoreFuture;
private volatile String currentRestoreName;
private String includeConfFiles;
private NamedList confFileNameAlias = new NamedList<>();
private boolean isMaster = false;
private boolean isSlave = false;
private boolean replicateOnOptimize = false;
private boolean replicateOnCommit = false;
private boolean replicateOnStart = false;
private volatile ScheduledExecutorService executorService;
private volatile long executorStartTime;
private int numberBackupsToKeep = 0; //zero: do not delete old backups
private int numTimesReplicated = 0;
private final Map confFileInfoCache = new HashMap<>();
private Long reserveCommitDuration = readIntervalMs("00:00:10");
volatile IndexCommit indexCommitPoint;
volatile NamedList snapShootDetails;
private AtomicBoolean replicationEnabled = new AtomicBoolean(true);
private Long pollIntervalNs;
private String pollIntervalStr;
private PollListener pollListener;
public interface PollListener {
void onComplete(SolrCore solrCore, IndexFetchResult fetchResult) throws IOException;
}
/**
* Disable the timer task for polling
*/
private AtomicBoolean pollDisabled = new AtomicBoolean(false);
String getPollInterval() {
return pollIntervalStr;
}
public void setPollListener(PollListener pollListener) {
this.pollListener = pollListener;
}
@Override
public void handleRequestBody(SolrQueryRequest req, SolrQueryResponse rsp) throws Exception {
rsp.setHttpCaching(false);
final SolrParams solrParams = req.getParams();
String command = solrParams.required().get(COMMAND);
// This command does not give the current index version of the master
// It gives the current 'replicateable' index version
if (command.equals(CMD_INDEX_VERSION)) {
IndexCommit commitPoint = indexCommitPoint; // make a copy so it won't change
if (commitPoint == null) {
// if this handler is 'lazy', we may not have tracked the last commit
// because our commit listener is registered on inform
commitPoint = core.getDeletionPolicy().getLatestCommit();
}
if (commitPoint != null && replicationEnabled.get()) {
//
// There is a race condition here. The commit point may be changed / deleted by the time
// we get around to reserving it. This is a very small window though, and should not result
// in a catastrophic failure, but will result in the client getting an empty file list for
// the CMD_GET_FILE_LIST command.
//
core.getDeletionPolicy().setReserveDuration(commitPoint.getGeneration(), reserveCommitDuration);
rsp.add(CMD_INDEX_VERSION, IndexDeletionPolicyWrapper.getCommitTimestamp(commitPoint));
rsp.add(GENERATION, commitPoint.getGeneration());
rsp.add(STATUS, OK_STATUS);
} else {
// This happens when replication is not configured to happen after startup and no commit/optimize
// has happened yet.
rsp.add(CMD_INDEX_VERSION, 0L);
rsp.add(GENERATION, 0L);
rsp.add(STATUS, OK_STATUS);
}
} else if (command.equals(CMD_GET_FILE)) {
getFileStream(solrParams, rsp);
} else if (command.equals(CMD_GET_FILE_LIST)) {
getFileList(solrParams, rsp);
} else if (command.equalsIgnoreCase(CMD_BACKUP)) {
doSnapShoot(new ModifiableSolrParams(solrParams), rsp, req);
} else if (command.equalsIgnoreCase(CMD_RESTORE)) {
restore(new ModifiableSolrParams(solrParams), rsp, req);
} else if (command.equalsIgnoreCase(CMD_RESTORE_STATUS)) {
populateRestoreStatus(rsp);
} else if (command.equalsIgnoreCase(CMD_DELETE_BACKUP)) {
deleteSnapshot(new ModifiableSolrParams(solrParams), rsp);
} else if (command.equalsIgnoreCase(CMD_FETCH_INDEX)) {
fetchIndex(solrParams, rsp);
} else if (command.equalsIgnoreCase(CMD_DISABLE_POLL)) {
disablePoll(rsp);
} else if (command.equalsIgnoreCase(CMD_ENABLE_POLL)) {
enablePoll(rsp);
} else if (command.equalsIgnoreCase(CMD_ABORT_FETCH)) {
if (abortFetch()) {
rsp.add(STATUS, OK_STATUS);
} else {
reportErrorOnResponse(rsp, "No slave configured", null);
}
} else if (command.equals(CMD_SHOW_COMMITS)) {
populateCommitInfo(rsp);
} else if (command.equals(CMD_DETAILS)) {
getReplicationDetails(rsp, solrParams.getBool("slave", true));
} else if (CMD_ENABLE_REPL.equalsIgnoreCase(command)) {
replicationEnabled.set(true);
rsp.add(STATUS, OK_STATUS);
} else if (CMD_DISABLE_REPL.equalsIgnoreCase(command)) {
replicationEnabled.set(false);
rsp.add(STATUS, OK_STATUS);
}
}
private void reportErrorOnResponse(SolrQueryResponse response, String message, Exception e) {
response.add(STATUS, ERR_STATUS);
response.add(MESSAGE, message);
if (e != null) {
response.add(EXCEPTION, e);
}
}
public boolean abortFetch() {
IndexFetcher fetcher = currentIndexFetcher;
if (fetcher != null){
fetcher.abortFetch();
return true;
} else {
return false;
}
}
private void deleteSnapshot(ModifiableSolrParams params, SolrQueryResponse rsp) {
String name = params.required().get(NAME);
SnapShooter snapShooter = new SnapShooter(core, params.get(CoreAdminParams.BACKUP_LOCATION), params.get(NAME));
snapShooter.validateDeleteSnapshot();
snapShooter.deleteSnapAsync(this);
rsp.add(STATUS, OK_STATUS);
}
private void fetchIndex(SolrParams solrParams, SolrQueryResponse rsp) throws InterruptedException {
String masterUrl = solrParams.get(MASTER_URL);
if (!isSlave && masterUrl == null) {
reportErrorOnResponse(rsp, "No slave configured or no 'masterUrl' specified", null);
return;
}
final SolrParams paramsCopy = new ModifiableSolrParams(solrParams);
final IndexFetchResult[] results = new IndexFetchResult[1];
Thread fetchThread = new Thread(() -> {
IndexFetchResult result = doFetch(paramsCopy, false);
results[0] = result;
}, "explicit-fetchindex-cmd") ;
fetchThread.setDaemon(false);
fetchThread.start();
if (solrParams.getBool(WAIT, false)) {
fetchThread.join();
if (results[0] == null) {
reportErrorOnResponse(rsp, "Unable to determine result of synchronous index fetch", null);
} else if (results[0].getSuccessful()) {
rsp.add(STATUS, OK_STATUS);
} else {
reportErrorOnResponse(rsp, results[0].getMessage(), null);
}
} else {
rsp.add(STATUS, OK_STATUS);
}
}
private List> getCommits() {
Map commits = core.getDeletionPolicy().getCommits();
List> l = new ArrayList<>();
for (IndexCommit c : commits.values()) {
try {
NamedList nl = new NamedList<>();
nl.add("indexVersion", IndexDeletionPolicyWrapper.getCommitTimestamp(c));
nl.add(GENERATION, c.getGeneration());
List commitList = new ArrayList<>(c.getFileNames().size());
commitList.addAll(c.getFileNames());
Collections.sort(commitList);
nl.add(CMD_GET_FILE_LIST, commitList);
l.add(nl);
} catch (IOException e) {
log.warn("Exception while reading files for commit " + c, e);
}
}
return l;
}
static Long getCheckSum(Checksum checksum, File f) {
FileInputStream fis = null;
checksum.reset();
byte[] buffer = new byte[1024 * 1024];
int bytesRead;
try {
fis = new FileInputStream(f);
while ((bytesRead = fis.read(buffer)) >= 0)
checksum.update(buffer, 0, bytesRead);
return checksum.getValue();
} catch (Exception e) {
log.warn("Exception in finding checksum of " + f, e);
} finally {
IOUtils.closeQuietly(fis);
}
return null;
}
private volatile IndexFetcher currentIndexFetcher;
public IndexFetchResult doFetch(SolrParams solrParams, boolean forceReplication) {
String masterUrl = solrParams == null ? null : solrParams.get(MASTER_URL);
if (!indexFetchLock.tryLock())
return IndexFetchResult.LOCK_OBTAIN_FAILED;
if (core.getCoreContainer().isShutDown()) {
log.warn("I was asked to replicate but CoreContainer is shutting down");
return IndexFetchResult.CONTAINER_IS_SHUTTING_DOWN;
}
try {
if (masterUrl != null) {
if (currentIndexFetcher != null && currentIndexFetcher != pollingIndexFetcher) {
currentIndexFetcher.destroy();
}
currentIndexFetcher = new IndexFetcher(solrParams.toNamedList(), this, core);
} else {
currentIndexFetcher = pollingIndexFetcher;
}
return currentIndexFetcher.fetchLatestIndex(forceReplication);
} catch (Exception e) {
SolrException.log(log, "Index fetch failed ", e);
if (currentIndexFetcher != pollingIndexFetcher) {
currentIndexFetcher.destroy();
}
return new IndexFetchResult(IndexFetchResult.FAILED_BY_EXCEPTION_MESSAGE, false, e);
} finally {
if (pollingIndexFetcher != null) {
if( currentIndexFetcher != pollingIndexFetcher) {
currentIndexFetcher.destroy();
}
currentIndexFetcher = pollingIndexFetcher;
}
indexFetchLock.unlock();
}
}
boolean isReplicating() {
return indexFetchLock.isLocked();
}
private void restore(SolrParams params, SolrQueryResponse rsp, SolrQueryRequest req) throws IOException {
if (restoreFuture != null && !restoreFuture.isDone()) {
throw new SolrException(ErrorCode.BAD_REQUEST, "Restore in progress. Cannot run multiple restore operations" +
"for the same core");
}
String name = params.get(NAME);
String location = params.get(CoreAdminParams.BACKUP_LOCATION);
String repoName = params.get(CoreAdminParams.BACKUP_REPOSITORY);
CoreContainer cc = core.getCoreContainer();
BackupRepository repo = null;
if (repoName != null) {
repo = cc.newBackupRepository(Optional.of(repoName));
location = repo.getBackupLocation(location);
if (location == null) {
throw new IllegalArgumentException("location is required");
}
} else {
repo = new LocalFileSystemRepository();
}
//If location is not provided then assume that the restore index is present inside the data directory.
if (location == null) {
location = core.getDataDir();
}
URI locationUri = repo.createURI(location);
//If name is not provided then look for the last unnamed( the ones with the snapshot.timestamp format)
//snapshot folder since we allow snapshots to be taken without providing a name. Pick the latest timestamp.
if (name == null) {
String[] filePaths = repo.listAll(locationUri);
List dirs = new ArrayList<>();
for (String f : filePaths) {
OldBackupDirectory obd = new OldBackupDirectory(locationUri, f);
if (obd.getTimestamp().isPresent()) {
dirs.add(obd);
}
}
Collections.sort(dirs);
if (dirs.size() == 0) {
throw new SolrException(ErrorCode.BAD_REQUEST, "No backup name specified and none found in " + core.getDataDir());
}
name = dirs.get(0).getDirName();
} else {
//"snapshot." is prefixed by snapshooter
name = "snapshot." + name;
}
RestoreCore restoreCore = new RestoreCore(repo, core, locationUri, name);
try {
MDC.put("RestoreCore.core", core.getName());
MDC.put("RestoreCore.backupLocation", location);
MDC.put("RestoreCore.backupName", name);
restoreFuture = restoreExecutor.submit(restoreCore);
currentRestoreName = name;
rsp.add(STATUS, OK_STATUS);
} finally {
MDC.remove("RestoreCore.core");
MDC.remove("RestoreCore.backupLocation");
MDC.remove("RestoreCore.backupName");
}
}
private void populateRestoreStatus(SolrQueryResponse rsp) {
NamedList restoreStatus = new SimpleOrderedMap<>();
if (restoreFuture == null) {
restoreStatus.add(STATUS, "No restore actions in progress");
rsp.add(CMD_RESTORE_STATUS, restoreStatus);
rsp.add(STATUS, OK_STATUS);
return;
}
restoreStatus.add("snapshotName", currentRestoreName);
if (restoreFuture.isDone()) {
try {
boolean success = restoreFuture.get();
if (success) {
restoreStatus.add(STATUS, SUCCESS);
} else {
restoreStatus.add(STATUS, FAILED);
}
} catch (Exception e) {
restoreStatus.add(STATUS, FAILED);
restoreStatus.add(EXCEPTION, e.getMessage());
rsp.add(CMD_RESTORE_STATUS, restoreStatus);
reportErrorOnResponse(rsp, "Unable to read restorestatus", e);
return;
}
} else {
restoreStatus.add(STATUS, "In Progress");
}
rsp.add(CMD_RESTORE_STATUS, restoreStatus);
rsp.add(STATUS, OK_STATUS);
}
private void populateCommitInfo(SolrQueryResponse rsp) {
rsp.add(CMD_SHOW_COMMITS, getCommits());
rsp.add(STATUS, OK_STATUS);
}
private void doSnapShoot(SolrParams params, SolrQueryResponse rsp, SolrQueryRequest req) {
try {
int numberToKeep = params.getInt(NUMBER_BACKUPS_TO_KEEP_REQUEST_PARAM, 0);
if (numberToKeep > 0 && numberBackupsToKeep > 0) {
throw new SolrException(ErrorCode.BAD_REQUEST, "Cannot use " + NUMBER_BACKUPS_TO_KEEP_REQUEST_PARAM +
" if " + NUMBER_BACKUPS_TO_KEEP_INIT_PARAM + " was specified in the configuration.");
}
numberToKeep = Math.max(numberToKeep, numberBackupsToKeep);
if (numberToKeep < 1) {
numberToKeep = Integer.MAX_VALUE;
}
String location = params.get(CoreAdminParams.BACKUP_LOCATION);
String repoName = params.get(CoreAdminParams.BACKUP_REPOSITORY);
CoreContainer cc = core.getCoreContainer();
BackupRepository repo = null;
if (repoName != null) {
repo = cc.newBackupRepository(Optional.of(repoName));
location = repo.getBackupLocation(location);
if (location == null) {
throw new IllegalArgumentException("location is required");
}
} else {
repo = new LocalFileSystemRepository();
if (location == null) {
location = core.getDataDir();
} else {
location = core.getCoreDescriptor().getInstanceDir().resolve(location).normalize().toString();
}
}
// small race here before the commit point is saved
URI locationUri = repo.createURI(location);
String commitName = params.get(CoreAdminParams.COMMIT_NAME);
SnapShooter snapShooter = new SnapShooter(repo, core, locationUri, params.get(NAME), commitName);
snapShooter.validateCreateSnapshot();
snapShooter.createSnapAsync(numberToKeep, (nl) -> snapShootDetails = nl);
rsp.add(STATUS, OK_STATUS);
} catch (SolrException e) {
throw e;
} catch (Exception e) {
log.error("Exception while creating a snapshot", e);
reportErrorOnResponse(rsp, "Error encountered while creating a snapshot: " + e.getMessage(), e);
}
}
/**
* This method adds an Object of FileStream to the response . The FileStream implements a custom protocol which is
* understood by IndexFetcher.FileFetcher
*
* @see IndexFetcher.LocalFsFileFetcher
* @see IndexFetcher.DirectoryFileFetcher
*/
private void getFileStream(SolrParams solrParams, SolrQueryResponse rsp) {
ModifiableSolrParams rawParams = new ModifiableSolrParams(solrParams);
rawParams.set(CommonParams.WT, FILE_STREAM);
String cfileName = solrParams.get(CONF_FILE_SHORT);
String tlogFileName = solrParams.get(TLOG_FILE);
if (cfileName != null) {
rsp.add(FILE_STREAM, new LocalFsConfFileStream(solrParams));
} else if (tlogFileName != null) {
rsp.add(FILE_STREAM, new LocalFsTlogFileStream(solrParams));
} else {
rsp.add(FILE_STREAM, new DirectoryFileStream(solrParams));
}
rsp.add(STATUS, OK_STATUS);
}
@SuppressWarnings("unchecked")
private void getFileList(SolrParams solrParams, SolrQueryResponse rsp) {
final IndexDeletionPolicyWrapper delPol = core.getDeletionPolicy();
final long gen = Long.parseLong(solrParams.required().get(GENERATION));
IndexCommit commit = null;
try {
if (gen == -1) {
commit = delPol.getAndSaveLatestCommit();
if (null == commit) {
rsp.add(CMD_GET_FILE_LIST, Collections.EMPTY_LIST);
return;
}
} else {
try {
commit = delPol.getAndSaveCommitPoint(gen);
} catch (IllegalStateException ignored) {
/* handle this below the same way we handle a return value of null... */
}
if (null == commit) {
// The gen they asked for either doesn't exist or has already been deleted
reportErrorOnResponse(rsp, "invalid index generation", null);
return;
}
}
assert null != commit;
List> result = new ArrayList<>();
Directory dir = null;
try {
dir = core.getDirectoryFactory().get(core.getNewIndexDir(), DirContext.DEFAULT, core.getSolrConfig().indexConfig.lockType);
SegmentInfos infos = SegmentInfos.readCommit(dir, commit.getSegmentsFileName());
for (SegmentCommitInfo commitInfo : infos) {
for (String file : commitInfo.files()) {
Map fileMeta = new HashMap<>();
fileMeta.put(NAME, file);
fileMeta.put(SIZE, dir.fileLength(file));
try (final IndexInput in = dir.openInput(file, IOContext.READONCE)) {
try {
long checksum = CodecUtil.retrieveChecksum(in);
fileMeta.put(CHECKSUM, checksum);
} catch (Exception e) {
//TODO Should this trigger a larger error?
log.warn("Could not read checksum from index file: " + file, e);
}
}
result.add(fileMeta);
}
}
// add the segments_N file
Map fileMeta = new HashMap<>();
fileMeta.put(NAME, infos.getSegmentsFileName());
fileMeta.put(SIZE, dir.fileLength(infos.getSegmentsFileName()));
if (infos.getId() != null) {
try (final IndexInput in = dir.openInput(infos.getSegmentsFileName(), IOContext.READONCE)) {
try {
fileMeta.put(CHECKSUM, CodecUtil.retrieveChecksum(in));
} catch (Exception e) {
//TODO Should this trigger a larger error?
log.warn("Could not read checksum from index file: " + infos.getSegmentsFileName(), e);
}
}
}
result.add(fileMeta);
} catch (IOException e) {
log.error("Unable to get file names for indexCommit generation: " + commit.getGeneration(), e);
reportErrorOnResponse(rsp, "unable to get file names for given index generation", e);
return;
} finally {
if (dir != null) {
try {
core.getDirectoryFactory().release(dir);
} catch (IOException e) {
SolrException.log(log, "Could not release directory after fetching file list", e);
}
}
}
rsp.add(CMD_GET_FILE_LIST, result);
if (solrParams.getBool(TLOG_FILES, false)) {
try {
List> tlogfiles = getTlogFileList(commit);
log.info("Adding tlog files to list: " + tlogfiles);
rsp.add(TLOG_FILES, tlogfiles);
}
catch (IOException e) {
log.error("Unable to get tlog file names for indexCommit generation: " + commit.getGeneration(), e);
reportErrorOnResponse(rsp, "unable to get tlog file names for given index generation", e);
return;
}
}
if (confFileNameAlias.size() < 1 || core.getCoreContainer().isZooKeeperAware())
return;
log.debug("Adding config files to list: " + includeConfFiles);
//if configuration files need to be included get their details
rsp.add(CONF_FILES, getConfFileInfoFromCache(confFileNameAlias, confFileInfoCache));
rsp.add(STATUS, OK_STATUS);
} finally {
if (null != commit) {
// before releasing the save on our commit point, set a short reserve duration since
// the main reason remote nodes will ask for the file list is because they are preparing to
// replicate from us...
delPol.setReserveDuration(commit.getGeneration(), reserveCommitDuration);
delPol.releaseCommitPoint(commit);
}
}
}
/**
* Retrieves the list of tlog files associated to a commit point.
* NOTE: The commit MUST be reserved before calling this method
*/
List> getTlogFileList(IndexCommit commit) throws IOException {
long maxVersion = this.getMaxVersion(commit);
CdcrUpdateLog ulog = (CdcrUpdateLog) core.getUpdateHandler().getUpdateLog();
String[] logList = ulog.getLogList(new File(ulog.getLogDir()));
List> tlogFiles = new ArrayList<>();
for (String fileName : logList) {
// filter out tlogs that are older than the current index commit generation, so that the list of tlog files is
// in synch with the latest index commit point
long startVersion = Math.abs(Long.parseLong(fileName.substring(fileName.lastIndexOf('.') + 1)));
if (startVersion < maxVersion) {
Map fileMeta = new HashMap<>();
fileMeta.put(NAME, fileName);
fileMeta.put(SIZE, new File(ulog.getLogDir(), fileName).length());
tlogFiles.add(fileMeta);
}
}
return tlogFiles;
}
/**
* Retrieves the maximum version number from an index commit.
* NOTE: The commit MUST be reserved before calling this method
*/
private long getMaxVersion(IndexCommit commit) throws IOException {
try (DirectoryReader reader = DirectoryReader.open(commit)) {
IndexSearcher searcher = new IndexSearcher(reader);
VersionInfo vinfo = core.getUpdateHandler().getUpdateLog().getVersionInfo();
return Math.abs(vinfo.getMaxVersionFromIndex(searcher));
}
}
/**
* For configuration files, checksum of the file is included because, unlike index files, they may have same content
* but different timestamps.
*
* The local conf files information is cached so that everytime it does not have to compute the checksum. The cache is
* refreshed only if the lastModified of the file changes
*/
List> getConfFileInfoFromCache(NamedList nameAndAlias,
final Map confFileInfoCache) {
List> confFiles = new ArrayList<>();
synchronized (confFileInfoCache) {
File confDir = new File(core.getResourceLoader().getConfigDir());
Checksum checksum = null;
for (int i = 0; i < nameAndAlias.size(); i++) {
String cf = nameAndAlias.getName(i);
File f = new File(confDir, cf);
if (!f.exists() || f.isDirectory()) continue; //must not happen
FileInfo info = confFileInfoCache.get(cf);
if (info == null || info.lastmodified != f.lastModified() || info.size != f.length()) {
if (checksum == null) checksum = new Adler32();
info = new FileInfo(f.lastModified(), cf, f.length(), getCheckSum(checksum, f));
confFileInfoCache.put(cf, info);
}
Map m = info.getAsMap();
if (nameAndAlias.getVal(i) != null) m.put(ALIAS, nameAndAlias.getVal(i));
confFiles.add(m);
}
}
return confFiles;
}
static class FileInfo {
long lastmodified;
String name;
long size;
long checksum;
public FileInfo(long lasmodified, String name, long size, long checksum) {
this.lastmodified = lasmodified;
this.name = name;
this.size = size;
this.checksum = checksum;
}
Map getAsMap() {
Map map = new HashMap<>();
map.put(NAME, name);
map.put(SIZE, size);
map.put(CHECKSUM, checksum);
return map;
}
}
private void disablePoll(SolrQueryResponse rsp) {
if (pollingIndexFetcher != null){
pollDisabled.set(true);
log.info("inside disable poll, value of pollDisabled = " + pollDisabled);
rsp.add(STATUS, OK_STATUS);
} else {
reportErrorOnResponse(rsp, "No slave configured", null);
}
}
private void enablePoll(SolrQueryResponse rsp) {
if (pollingIndexFetcher != null){
pollDisabled.set(false);
log.info("inside enable poll, value of pollDisabled = " + pollDisabled);
rsp.add(STATUS, OK_STATUS);
} else {
reportErrorOnResponse(rsp, "No slave configured", null);
}
}
boolean isPollingDisabled() {
return pollDisabled.get();
}
@SuppressForbidden(reason = "Need currentTimeMillis, to output next execution time in replication details")
private void markScheduledExecutionStart() {
executorStartTime = System.currentTimeMillis();
}
private Date getNextScheduledExecTime() {
Date nextTime = null;
if (executorStartTime > 0)
nextTime = new Date(executorStartTime + TimeUnit.MILLISECONDS.convert(pollIntervalNs, TimeUnit.NANOSECONDS));
return nextTime;
}
int getTimesReplicatedSinceStartup() {
return numTimesReplicated;
}
void setTimesReplicatedSinceStartup() {
numTimesReplicated++;
}
@Override
public Category getCategory() {
return Category.REPLICATION;
}
@Override
public String getDescription() {
return "ReplicationHandler provides replication of index and configuration files from Master to Slaves";
}
/**
* returns the CommitVersionInfo for the current searcher, or null on error.
*/
private CommitVersionInfo getIndexVersion() {
try {
return core.withSearcher(searcher -> CommitVersionInfo.build(searcher.getIndexReader().getIndexCommit()));
} catch (IOException e) {
log.warn("Unable to get index commit: ", e);
return null;
}
}
@Override
public void initializeMetrics(SolrMetricsContext parentContext, String scope) {
super.initializeMetrics(parentContext, scope);
solrMetricsContext.gauge(this, () -> (core != null && !core.isClosed() ? NumberUtils.readableSize(core.getIndexSize()) : ""),
true, "indexSize", getCategory().toString(), scope);
solrMetricsContext.gauge(this, () -> (core != null && !core.isClosed() ? getIndexVersion().toString() : ""),
true, "indexVersion", getCategory().toString(), scope);
solrMetricsContext.gauge(this, () -> (core != null && !core.isClosed() ? getIndexVersion().generation : 0),
true, GENERATION, getCategory().toString(), scope);
solrMetricsContext.gauge(this, () -> (core != null && !core.isClosed() ? core.getIndexDir() : ""),
true, "indexPath", getCategory().toString(), scope);
solrMetricsContext.gauge(this, () -> isMaster,
true, "isMaster", getCategory().toString(), scope);
solrMetricsContext.gauge(this, () -> isSlave,
true, "isSlave", getCategory().toString(), scope);
final MetricsMap fetcherMap = new MetricsMap((detailed, map) -> {
IndexFetcher fetcher = currentIndexFetcher;
if (fetcher != null) {
map.put(MASTER_URL, fetcher.getMasterUrl());
if (getPollInterval() != null) {
map.put(POLL_INTERVAL, getPollInterval());
}
map.put("isPollingDisabled", isPollingDisabled());
map.put("isReplicating", isReplicating());
long elapsed = fetcher.getReplicationTimeElapsed();
long val = fetcher.getTotalBytesDownloaded();
if (elapsed > 0) {
map.put("timeElapsed", elapsed);
map.put("bytesDownloaded", val);
map.put("downloadSpeed", val / elapsed);
}
Properties props = loadReplicationProperties();
addVal(map, IndexFetcher.PREVIOUS_CYCLE_TIME_TAKEN, props, Long.class);
addVal(map, IndexFetcher.INDEX_REPLICATED_AT, props, Date.class);
addVal(map, IndexFetcher.CONF_FILES_REPLICATED_AT, props, Date.class);
addVal(map, IndexFetcher.REPLICATION_FAILED_AT, props, Date.class);
addVal(map, IndexFetcher.TIMES_FAILED, props, Integer.class);
addVal(map, IndexFetcher.TIMES_INDEX_REPLICATED, props, Integer.class);
addVal(map, IndexFetcher.LAST_CYCLE_BYTES_DOWNLOADED, props, Long.class);
addVal(map, IndexFetcher.TIMES_CONFIG_REPLICATED, props, Integer.class);
addVal(map, IndexFetcher.CONF_FILES_REPLICATED, props, String.class);
}
});
solrMetricsContext.gauge(this , fetcherMap, true, "fetcher", getCategory().toString(), scope);
solrMetricsContext.gauge(this, () -> isMaster && includeConfFiles != null ? includeConfFiles : "",
true, "confFilesToReplicate", getCategory().toString(), scope);
solrMetricsContext.gauge(this, () -> isMaster ? getReplicateAfterStrings() : Collections.emptyList(),
true, REPLICATE_AFTER, getCategory().toString(), scope);
solrMetricsContext.gauge(this, () -> isMaster && replicationEnabled.get(),
true, "replicationEnabled", getCategory().toString(), scope);
}
//TODO Should a failure retrieving any piece of info mark the overall request as a failure? Is there a core set of values that are required to make a response here useful?
/**
* Used for showing statistics and progress information.
*/
private NamedList getReplicationDetails(SolrQueryResponse rsp, boolean showSlaveDetails) {
NamedList details = new SimpleOrderedMap<>();
NamedList master = new SimpleOrderedMap<>();
NamedList slave = new SimpleOrderedMap<>();
details.add("indexSize", NumberUtils.readableSize(core.getIndexSize()));
details.add("indexPath", core.getIndexDir());
details.add(CMD_SHOW_COMMITS, getCommits());
details.add("isMaster", String.valueOf(isMaster));
details.add("isSlave", String.valueOf(isSlave));
CommitVersionInfo vInfo = getIndexVersion();
details.add("indexVersion", null == vInfo ? 0 : vInfo.version);
details.add(GENERATION, null == vInfo ? 0 : vInfo.generation);
IndexCommit commit = indexCommitPoint; // make a copy so it won't change
if (isMaster) {
if (includeConfFiles != null) master.add(CONF_FILES, includeConfFiles);
master.add(REPLICATE_AFTER, getReplicateAfterStrings());
master.add("replicationEnabled", String.valueOf(replicationEnabled.get()));
}
if (isMaster && commit != null) {
CommitVersionInfo repCommitInfo = CommitVersionInfo.build(commit);
master.add("replicableVersion", repCommitInfo.version);
master.add("replicableGeneration", repCommitInfo.generation);
}
IndexFetcher fetcher = currentIndexFetcher;
if (fetcher != null) {
Properties props = loadReplicationProperties();
if (showSlaveDetails) {
try {
NamedList nl = fetcher.getDetails();
slave.add("masterDetails", nl.get(CMD_DETAILS));
} catch (Exception e) {
log.warn(
"Exception while invoking 'details' method for replication on master ",
e);
slave.add(ERR_STATUS, "invalid_master");
}
}
slave.add(MASTER_URL, fetcher.getMasterUrl());
if (getPollInterval() != null) {
slave.add(POLL_INTERVAL, getPollInterval());
}
Date nextScheduled = getNextScheduledExecTime();
if (nextScheduled != null && !isPollingDisabled()) {
slave.add(NEXT_EXECUTION_AT, nextScheduled.toString());
} else if (isPollingDisabled()) {
slave.add(NEXT_EXECUTION_AT, "Polling disabled");
}
addVal(slave, IndexFetcher.INDEX_REPLICATED_AT, props, Date.class);
addVal(slave, IndexFetcher.INDEX_REPLICATED_AT_LIST, props, List.class);
addVal(slave, IndexFetcher.REPLICATION_FAILED_AT_LIST, props, List.class);
addVal(slave, IndexFetcher.TIMES_INDEX_REPLICATED, props, Integer.class);
addVal(slave, IndexFetcher.CONF_FILES_REPLICATED, props, Integer.class);
addVal(slave, IndexFetcher.TIMES_CONFIG_REPLICATED, props, Integer.class);
addVal(slave, IndexFetcher.CONF_FILES_REPLICATED_AT, props, Integer.class);
addVal(slave, IndexFetcher.LAST_CYCLE_BYTES_DOWNLOADED, props, Long.class);
addVal(slave, IndexFetcher.TIMES_FAILED, props, Integer.class);
addVal(slave, IndexFetcher.REPLICATION_FAILED_AT, props, Date.class);
addVal(slave, IndexFetcher.PREVIOUS_CYCLE_TIME_TAKEN, props, Long.class);
addVal(slave, IndexFetcher.CLEARED_LOCAL_IDX, props, Long.class);
slave.add("currentDate", new Date().toString());
slave.add("isPollingDisabled", String.valueOf(isPollingDisabled()));
boolean isReplicating = isReplicating();
slave.add("isReplicating", String.valueOf(isReplicating));
if (isReplicating) {
try {
long bytesToDownload = 0;
List filesToDownload = new ArrayList<>();
for (Map file : fetcher.getFilesToDownload()) {
filesToDownload.add((String) file.get(NAME));
bytesToDownload += (Long) file.get(SIZE);
}
//get list of conf files to download
for (Map file : fetcher.getConfFilesToDownload()) {
filesToDownload.add((String) file.get(NAME));
bytesToDownload += (Long) file.get(SIZE);
}
slave.add("filesToDownload", filesToDownload);
slave.add("numFilesToDownload", String.valueOf(filesToDownload.size()));
slave.add("bytesToDownload", NumberUtils.readableSize(bytesToDownload));
long bytesDownloaded = 0;
List filesDownloaded = new ArrayList<>();
for (Map file : fetcher.getFilesDownloaded()) {
filesDownloaded.add((String) file.get(NAME));
bytesDownloaded += (Long) file.get(SIZE);
}
//get list of conf files downloaded
for (Map file : fetcher.getConfFilesDownloaded()) {
filesDownloaded.add((String) file.get(NAME));
bytesDownloaded += (Long) file.get(SIZE);
}
Map currentFile = fetcher.getCurrentFile();
String currFile = null;
long currFileSize = 0, currFileSizeDownloaded = 0;
float percentDownloaded = 0;
if (currentFile != null) {
currFile = (String) currentFile.get(NAME);
currFileSize = (Long) currentFile.get(SIZE);
if (currentFile.containsKey("bytesDownloaded")) {
currFileSizeDownloaded = (Long) currentFile.get("bytesDownloaded");
bytesDownloaded += currFileSizeDownloaded;
if (currFileSize > 0)
percentDownloaded = (currFileSizeDownloaded * 100) / currFileSize;
}
}
slave.add("filesDownloaded", filesDownloaded);
slave.add("numFilesDownloaded", String.valueOf(filesDownloaded.size()));
long estimatedTimeRemaining = 0;
Date replicationStartTimeStamp = fetcher.getReplicationStartTimeStamp();
if (replicationStartTimeStamp != null) {
slave.add("replicationStartTime", replicationStartTimeStamp.toString());
}
long elapsed = fetcher.getReplicationTimeElapsed();
slave.add("timeElapsed", String.valueOf(elapsed) + "s");
if (bytesDownloaded > 0)
estimatedTimeRemaining = ((bytesToDownload - bytesDownloaded) * elapsed) / bytesDownloaded;
float totalPercent = 0;
long downloadSpeed = 0;
if (bytesToDownload > 0)
totalPercent = (bytesDownloaded * 100) / bytesToDownload;
if (elapsed > 0)
downloadSpeed = (bytesDownloaded / elapsed);
if (currFile != null)
slave.add("currentFile", currFile);
slave.add("currentFileSize", NumberUtils.readableSize(currFileSize));
slave.add("currentFileSizeDownloaded", NumberUtils.readableSize(currFileSizeDownloaded));
slave.add("currentFileSizePercent", String.valueOf(percentDownloaded));
slave.add("bytesDownloaded", NumberUtils.readableSize(bytesDownloaded));
slave.add("totalPercent", String.valueOf(totalPercent));
slave.add("timeRemaining", String.valueOf(estimatedTimeRemaining) + "s");
slave.add("downloadSpeed", NumberUtils.readableSize(downloadSpeed));
} catch (Exception e) {
log.error("Exception while writing replication details: ", e);
}
}
}
if (isMaster)
details.add("master", master);
if (slave.size() > 0)
details.add("slave", slave);
NamedList snapshotStats = snapShootDetails;
if (snapshotStats != null)
details.add(CMD_BACKUP, snapshotStats);
if (rsp.getValues().get(STATUS) == null) {
rsp.add(STATUS, OK_STATUS);
}
rsp.add(CMD_DETAILS, details);
return details;
}
private void addVal(NamedList nl, String key, Properties props, Class clzz) {
Object val = formatVal(key, props, clzz);
if (val != null) {
nl.add(key, val);
}
}
private void addVal(Map map, String key, Properties props, Class clzz) {
Object val = formatVal(key, props, clzz);
if (val != null) {
map.put(key, val);
}
}
private Object formatVal(String key, Properties props, Class clzz) {
String s = props.getProperty(key);
if (s == null || s.trim().length() == 0) return null;
if (clzz == Date.class) {
try {
Long l = Long.parseLong(s);
return new Date(l).toString();
} catch (NumberFormatException e) {
return null;
}
} else if (clzz == List.class) {
String ss[] = s.split(",");
List l = new ArrayList<>();
for (String s1 : ss) {
l.add(new Date(Long.parseLong(s1)).toString());
}
return l;
} else {
return s;
}
}
private List getReplicateAfterStrings() {
List replicateAfter = new ArrayList<>();
if (replicateOnCommit)
replicateAfter.add("commit");
if (replicateOnOptimize)
replicateAfter.add("optimize");
if (replicateOnStart)
replicateAfter.add("startup");
return replicateAfter;
}
Properties loadReplicationProperties() {
Directory dir = null;
try {
try {
dir = core.getDirectoryFactory().get(core.getDataDir(),
DirContext.META_DATA, core.getSolrConfig().indexConfig.lockType);
IndexInput input;
try {
input = dir.openInput(
IndexFetcher.REPLICATION_PROPERTIES, IOContext.DEFAULT);
} catch (FileNotFoundException | NoSuchFileException e) {
return new Properties();
}
try {
final InputStream is = new PropertiesInputStream(input);
Properties props = new Properties();
props.load(new InputStreamReader(is, StandardCharsets.UTF_8));
return props;
} finally {
input.close();
}
} finally {
if (dir != null) {
core.getDirectoryFactory().release(dir);
}
}
} catch (IOException e) {
throw new SolrException(ErrorCode.SERVER_ERROR, e);
}
}
// void refreshCommitpoint() {
// IndexCommit commitPoint = core.getDeletionPolicy().getLatestCommit();
// if(replicateOnCommit || (replicateOnOptimize && commitPoint.getSegmentCount() == 1)) {
// indexCommitPoint = commitPoint;
// }
// }
private void setupPolling(String intervalStr) {
pollIntervalStr = intervalStr;
pollIntervalNs = readIntervalNs(pollIntervalStr);
if (pollIntervalNs == null || pollIntervalNs <= 0) {
log.info(" No value set for 'pollInterval'. Timer Task not started.");
return;
}
Runnable task = () -> {
if (pollDisabled.get()) {
log.info("Poll disabled");
return;
}
try {
log.debug("Polling for index modifications");
markScheduledExecutionStart();
IndexFetchResult fetchResult = doFetch(null, false);
if (pollListener != null) pollListener.onComplete(core, fetchResult);
} catch (Exception e) {
log.error("Exception in fetching index", e);
}
};
executorService = Executors.newSingleThreadScheduledExecutor(
new DefaultSolrThreadFactory("indexFetcher"));
// Randomize initial delay, with a minimum of 1ms
long initialDelayNs = new Random().nextLong() % pollIntervalNs
+ TimeUnit.NANOSECONDS.convert(1, TimeUnit.MILLISECONDS);
executorService.scheduleAtFixedRate(task, initialDelayNs, pollIntervalNs, TimeUnit.NANOSECONDS);
log.info("Poll scheduled at an interval of {}ms",
TimeUnit.MILLISECONDS.convert(pollIntervalNs, TimeUnit.NANOSECONDS));
}
@Override
@SuppressWarnings({"unchecked", "resource"})
public void inform(SolrCore core) {
this.core = core;
registerCloseHook();
Long deprecatedReserveCommitDuration = null;
Object nbtk = initArgs.get(NUMBER_BACKUPS_TO_KEEP_INIT_PARAM);
if(nbtk!=null) {
numberBackupsToKeep = Integer.parseInt(nbtk.toString());
} else {
numberBackupsToKeep = 0;
}
NamedList slave = (NamedList) initArgs.get("slave");
boolean enableSlave = isEnabled( slave );
if (enableSlave) {
currentIndexFetcher = pollingIndexFetcher = new IndexFetcher(slave, this, core);
setupPolling((String) slave.get(POLL_INTERVAL));
isSlave = true;
}
NamedList master = (NamedList) initArgs.get("master");
boolean enableMaster = isEnabled( master );
if (enableMaster || (enableSlave && !currentIndexFetcher.fetchFromLeader)) {
if (core.getCoreContainer().getZkController() != null) {
log.warn("SolrCloud is enabled for core " + core.getName() + " but so is old-style replication. Make sure you" +
" intend this behavior, it usually indicates a mis-configuration. Master setting is " +
Boolean.toString(enableMaster) + " and slave setting is " + Boolean.toString(enableSlave));
}
}
if (!enableSlave && !enableMaster) {
enableMaster = true;
master = new NamedList<>();
}
if (enableMaster) {
includeConfFiles = (String) master.get(CONF_FILES);
if (includeConfFiles != null && includeConfFiles.trim().length() > 0) {
List files = Arrays.asList(includeConfFiles.split(","));
for (String file : files) {
if (file.trim().length() == 0) continue;
String[] strs = file.trim().split(":");
// if there is an alias add it or it is null
confFileNameAlias.add(strs[0], strs.length > 1 ? strs[1] : null);
}
log.info("Replication enabled for following config files: " + includeConfFiles);
}
List backup = master.getAll("backupAfter");
boolean backupOnCommit = backup.contains("commit");
boolean backupOnOptimize = !backupOnCommit && backup.contains("optimize");
List replicateAfter = master.getAll(REPLICATE_AFTER);
replicateOnCommit = replicateAfter.contains("commit");
replicateOnOptimize = !replicateOnCommit && replicateAfter.contains("optimize");
if (!replicateOnCommit && ! replicateOnOptimize) {
replicateOnCommit = true;
}
// if we only want to replicate on optimize, we need the deletion policy to
// save the last optimized commit point.
if (replicateOnOptimize) {
IndexDeletionPolicyWrapper wrapper = core.getDeletionPolicy();
IndexDeletionPolicy policy = wrapper == null ? null : wrapper.getWrappedDeletionPolicy();
if (policy instanceof SolrDeletionPolicy) {
SolrDeletionPolicy solrPolicy = (SolrDeletionPolicy)policy;
if (solrPolicy.getMaxOptimizedCommitsToKeep() < 1) {
solrPolicy.setMaxOptimizedCommitsToKeep(1);
}
} else {
log.warn("Replication can't call setMaxOptimizedCommitsToKeep on " + policy);
}
}
if (replicateOnOptimize || backupOnOptimize) {
core.getUpdateHandler().registerOptimizeCallback(getEventListener(backupOnOptimize, replicateOnOptimize));
}
if (replicateOnCommit || backupOnCommit) {
replicateOnCommit = true;
core.getUpdateHandler().registerCommitCallback(getEventListener(backupOnCommit, replicateOnCommit));
}
if (replicateAfter.contains("startup")) {
replicateOnStart = true;
RefCounted s = core.getNewestSearcher(false);
try {
DirectoryReader reader = (s == null) ? null : s.get().getIndexReader();
if (reader!=null && reader.getIndexCommit() != null && reader.getIndexCommit().getGeneration() != 1L) {
try {
if(replicateOnOptimize){
Collection commits = DirectoryReader.listCommits(reader.directory());
for (IndexCommit ic : commits) {
if(ic.getSegmentCount() == 1){
if(indexCommitPoint == null || indexCommitPoint.getGeneration() < ic.getGeneration()) indexCommitPoint = ic;
}
}
} else{
indexCommitPoint = reader.getIndexCommit();
}
} finally {
// We don't need to save commit points for replication, the SolrDeletionPolicy
// always saves the last commit point (and the last optimized commit point, if needed)
/***
if(indexCommitPoint != null){
core.getDeletionPolicy().saveCommitPoint(indexCommitPoint.getGeneration());
}
***/
}
}
// ensure the writer is init'd so that we have a list of commit points
RefCounted iw = core.getUpdateHandler().getSolrCoreState().getIndexWriter(core);
iw.decref();
} catch (IOException e) {
log.warn("Unable to get IndexCommit on startup", e);
} finally {
if (s!=null) s.decref();
}
}
String reserve = (String) master.get(RESERVE);
if (reserve != null && !reserve.trim().equals("")) {
reserveCommitDuration = readIntervalMs(reserve);
deprecatedReserveCommitDuration = reserveCommitDuration;
// remove this error check & backcompat logic when Version.LUCENE_7_1_0 is removed
assertWarnOrFail(
"Beginning with Solr 7.1, master."+RESERVE + " is deprecated and should now be configured directly on the ReplicationHandler.",
(null == reserve),
core.getSolrConfig().luceneMatchVersion.onOrAfter(Version.LUCENE_7_1_0));
}
isMaster = true;
}
{
final String reserve = (String) initArgs.get(RESERVE);
if (reserve != null && !reserve.trim().equals("")) {
reserveCommitDuration = readIntervalMs(reserve);
if (deprecatedReserveCommitDuration != null) {
throw new IllegalArgumentException("'master."+RESERVE+"' and '"+RESERVE+"' are mutually exclusive.");
}
}
}
log.info("Commits will be reserved for " + reserveCommitDuration + "ms.");
}
// check master or slave is enabled
private boolean isEnabled( NamedList params ){
if( params == null ) return false;
Object enable = params.get( "enable" );
if( enable == null ) return true;
if( enable instanceof String )
return StrUtils.parseBool( (String)enable );
return Boolean.TRUE.equals( enable );
}
/**
* register a closehook
*/
private void registerCloseHook() {
core.addCloseHook(new CloseHook() {
@Override
public void preClose(SolrCore core) {
if (executorService != null) executorService.shutdown(); // we don't wait for shutdown - this can deadlock core reload
}
@Override
public void postClose(SolrCore core) {
if (pollingIndexFetcher != null) {
pollingIndexFetcher.destroy();
}
if (currentIndexFetcher != null && currentIndexFetcher != pollingIndexFetcher) {
currentIndexFetcher.destroy();
}
}
});
core.addCloseHook(new CloseHook() {
@Override
public void preClose(SolrCore core) {
ExecutorUtil.shutdownAndAwaitTermination(restoreExecutor);
if (restoreFuture != null) {
restoreFuture.cancel(false);
}
}
@Override
public void postClose(SolrCore core) {}
});
}
public void shutdown() {
if (executorService != null) executorService.shutdown();
if (pollingIndexFetcher != null) {
pollingIndexFetcher.destroy();
}
if (currentIndexFetcher != null && currentIndexFetcher != pollingIndexFetcher) {
currentIndexFetcher.destroy();
}
ExecutorUtil.shutdownAndAwaitTermination(restoreExecutor);
if (restoreFuture != null) {
restoreFuture.cancel(false);
}
ExecutorUtil.shutdownAndAwaitTermination(executorService);
}
/**
* Register a listener for postcommit/optimize
*
* @param snapshoot do a snapshoot
* @param getCommit get a commitpoint also
*
* @return an instance of the eventlistener
*/
private SolrEventListener getEventListener(final boolean snapshoot, final boolean getCommit) {
return new SolrEventListener() {
@Override
public void init(NamedList args) {/*no op*/ }
/**
* This refreshes the latest replicateable index commit and optionally can create Snapshots as well
*/
@Override
public void postCommit() {
IndexCommit currentCommitPoint = core.getDeletionPolicy().getLatestCommit();
if (getCommit) {
// IndexCommit oldCommitPoint = indexCommitPoint;
indexCommitPoint = currentCommitPoint;
// We don't need to save commit points for replication, the SolrDeletionPolicy
// always saves the last commit point (and the last optimized commit point, if needed)
/***
if (indexCommitPoint != null) {
core.getDeletionPolicy().saveCommitPoint(indexCommitPoint.getGeneration());
}
if(oldCommitPoint != null){
core.getDeletionPolicy().releaseCommitPointAndExtendReserve(oldCommitPoint.getGeneration());
}
***/
}
if (snapshoot) {
try {
int numberToKeep = numberBackupsToKeep;
if (numberToKeep < 1) {
numberToKeep = Integer.MAX_VALUE;
}
SnapShooter snapShooter = new SnapShooter(core, null, null);
snapShooter.validateCreateSnapshot();
snapShooter.createSnapAsync(numberToKeep, (nl) -> snapShootDetails = nl);
} catch (Exception e) {
log.error("Exception while snapshooting", e);
}
}
}
@Override
public void newSearcher(SolrIndexSearcher newSearcher, SolrIndexSearcher currentSearcher) { /*no op*/}
@Override
public void postSoftCommit() {
}
};
}
/**This class is used to read and send files in the lucene index
*
*/
private class DirectoryFileStream implements SolrCore.RawWriter {
protected SolrParams params;
protected FastOutputStream fos;
protected Long indexGen;
protected IndexDeletionPolicyWrapper delPolicy;
protected String fileName;
protected String cfileName;
protected String tlogFileName;
protected String sOffset;
protected String sLen;
protected String compress;
protected boolean useChecksum;
protected long offset = -1;
protected int len = -1;
protected Checksum checksum;
private RateLimiter rateLimiter;
byte[] buf;
public DirectoryFileStream(SolrParams solrParams) {
params = solrParams;
delPolicy = core.getDeletionPolicy();
fileName = validateFilenameOrError(params.get(FILE));
cfileName = validateFilenameOrError(params.get(CONF_FILE_SHORT));
tlogFileName = validateFilenameOrError(params.get(TLOG_FILE));
sOffset = params.get(OFFSET);
sLen = params.get(LEN);
compress = params.get(COMPRESSION);
useChecksum = params.getBool(CHECKSUM, false);
indexGen = params.getLong(GENERATION);
if (useChecksum) {
checksum = new Adler32();
}
//No throttle if MAX_WRITE_PER_SECOND is not specified
double maxWriteMBPerSec = params.getDouble(MAX_WRITE_PER_SECOND, Double.MAX_VALUE);
rateLimiter = new RateLimiter.SimpleRateLimiter(maxWriteMBPerSec);
}
// Throw exception on directory traversal attempts
protected String validateFilenameOrError(String filename) {
if (filename != null) {
Path filePath = Paths.get(filename);
filePath.forEach(subpath -> {
if ("..".equals(subpath.toString())) {
throw new SolrException(ErrorCode.FORBIDDEN, "File name cannot contain ..");
}
});
if (filePath.isAbsolute()) {
throw new SolrException(ErrorCode.FORBIDDEN, "File name must be relative");
}
return filename;
} else return null;
}
protected void initWrite() throws IOException {
if (sOffset != null) offset = Long.parseLong(sOffset);
if (sLen != null) len = Integer.parseInt(sLen);
if (fileName == null && cfileName == null && tlogFileName == null) {
// no filename do nothing
writeNothingAndFlush();
}
buf = new byte[(len == -1 || len > PACKET_SZ) ? PACKET_SZ : len];
//reserve commit point till write is complete
if(indexGen != null) {
delPolicy.saveCommitPoint(indexGen);
}
}
protected void createOutputStream(OutputStream out) {
out = new CloseShieldOutputStream(out); // DeflaterOutputStream requires a close call, but don't close the request outputstream
if (Boolean.parseBoolean(compress)) {
fos = new FastOutputStream(new DeflaterOutputStream(out));
} else {
fos = new FastOutputStream(out);
}
}
protected void extendReserveAndReleaseCommitPoint() {
if(indexGen != null) {
//Reserve the commit point for another 10s for the next file to be to fetched.
//We need to keep extending the commit reservation between requests so that the replica can fetch
//all the files correctly.
delPolicy.setReserveDuration(indexGen, reserveCommitDuration);
//release the commit point as the write is complete
delPolicy.releaseCommitPoint(indexGen);
}
}
public void write(OutputStream out) throws IOException {
createOutputStream(out);
IndexInput in = null;
try {
initWrite();
Directory dir = core.withSearcher(searcher -> searcher.getIndexReader().directory());
in = dir.openInput(fileName, IOContext.READONCE);
// if offset is mentioned move the pointer to that point
if (offset != -1) in.seek(offset);
long filelen = dir.fileLength(fileName);
long maxBytesBeforePause = 0;
while (true) {
offset = offset == -1 ? 0 : offset;
int read = (int) Math.min(buf.length, filelen - offset);
in.readBytes(buf, 0, read);
fos.writeInt(read);
if (useChecksum) {
checksum.reset();
checksum.update(buf, 0, read);
fos.writeLong(checksum.getValue());
}
fos.write(buf, 0, read);
fos.flush();
log.debug("Wrote {} bytes for file {}", offset + read, fileName);
//Pause if necessary
maxBytesBeforePause += read;
if (maxBytesBeforePause >= rateLimiter.getMinPauseCheckBytes()) {
rateLimiter.pause(maxBytesBeforePause);
maxBytesBeforePause = 0;
}
if (read != buf.length) {
writeNothingAndFlush();
fos.close(); // we close because DeflaterOutputStream requires a close call, but but the request outputstream is protected
break;
}
offset += read;
in.seek(offset);
}
} catch (IOException e) {
log.warn("Exception while writing response for params: " + params, e);
} finally {
if (in != null) {
in.close();
}
extendReserveAndReleaseCommitPoint();
}
}
/**
* Used to write a marker for EOF
*/
protected void writeNothingAndFlush() throws IOException {
fos.writeInt(0);
fos.flush();
}
}
/**This is used to write files in the conf directory.
*/
private abstract class LocalFsFileStream extends DirectoryFileStream {
private File file;
public LocalFsFileStream(SolrParams solrParams) {
super(solrParams);
this.file = this.initFile();
}
protected abstract File initFile();
@Override
public void write(OutputStream out) throws IOException {
createOutputStream(out);
FileInputStream inputStream = null;
try {
initWrite();
if (file.exists() && file.canRead()) {
inputStream = new FileInputStream(file);
FileChannel channel = inputStream.getChannel();
//if offset is mentioned move the pointer to that point
if (offset != -1)
channel.position(offset);
ByteBuffer bb = ByteBuffer.wrap(buf);
while (true) {
bb.clear();
long bytesRead = channel.read(bb);
if (bytesRead <= 0) {
writeNothingAndFlush();
fos.close(); // we close because DeflaterOutputStream requires a close call, but but the request outputstream is protected
break;
}
fos.writeInt((int) bytesRead);
if (useChecksum) {
checksum.reset();
checksum.update(buf, 0, (int) bytesRead);
fos.writeLong(checksum.getValue());
}
fos.write(buf, 0, (int) bytesRead);
fos.flush();
}
} else {
writeNothingAndFlush();
}
} catch (IOException e) {
log.warn("Exception while writing response for params: " + params, e);
} finally {
IOUtils.closeQuietly(inputStream);
extendReserveAndReleaseCommitPoint();
}
}
}
private class LocalFsTlogFileStream extends LocalFsFileStream {
public LocalFsTlogFileStream(SolrParams solrParams) {
super(solrParams);
}
protected File initFile() {
//if it is a tlog file read from tlog directory
return new File(core.getUpdateHandler().getUpdateLog().getLogDir(), tlogFileName);
}
}
private class LocalFsConfFileStream extends LocalFsFileStream {
public LocalFsConfFileStream(SolrParams solrParams) {
super(solrParams);
}
protected File initFile() {
//if it is a conf file read from config directory
return new File(core.getResourceLoader().getConfigDir(), cfileName);
}
}
private static Long readIntervalMs(String interval) {
return TimeUnit.MILLISECONDS.convert(readIntervalNs(interval), TimeUnit.NANOSECONDS);
}
private static Long readIntervalNs(String interval) {
if (interval == null)
return null;
int result = 0;
Matcher m = INTERVAL_PATTERN.matcher(interval.trim());
if (m.find()) {
String hr = m.group(1);
String min = m.group(2);
String sec = m.group(3);
result = 0;
try {
if (sec != null && sec.length() > 0)
result += Integer.parseInt(sec);
if (min != null && min.length() > 0)
result += (60 * Integer.parseInt(min));
if (hr != null && hr.length() > 0)
result += (60 * 60 * Integer.parseInt(hr));
return TimeUnit.NANOSECONDS.convert(result, TimeUnit.SECONDS);
} catch (NumberFormatException e) {
throw new SolrException(ErrorCode.SERVER_ERROR, INTERVAL_ERR_MSG);
}
} else {
throw new SolrException(ErrorCode.SERVER_ERROR, INTERVAL_ERR_MSG);
}
}
private static final String SUCCESS = "success";
private static final String FAILED = "failed";
private static final String EXCEPTION = "exception";
public static final String MASTER_URL = "masterUrl";
public static final String FETCH_FROM_LEADER = "fetchFromLeader";
// in case of TLOG replica, if masterVersion = zero, don't do commit
// otherwise updates from current tlog won't copied over properly to the new tlog, leading to data loss
public static final String SKIP_COMMIT_ON_MASTER_VERSION_ZERO = "skipCommitOnMasterVersionZero";
public static final String STATUS = "status";
public static final String MESSAGE = "message";
public static final String COMMAND = "command";
public static final String CMD_DETAILS = "details";
public static final String CMD_BACKUP = "backup";
public static final String CMD_RESTORE = "restore";
public static final String CMD_RESTORE_STATUS = "restorestatus";
public static final String CMD_FETCH_INDEX = "fetchindex";
public static final String CMD_ABORT_FETCH = "abortfetch";
public static final String CMD_GET_FILE_LIST = "filelist";
public static final String CMD_GET_FILE = "filecontent";
public static final String CMD_DISABLE_POLL = "disablepoll";
public static final String CMD_DISABLE_REPL = "disablereplication";
public static final String CMD_ENABLE_REPL = "enablereplication";
public static final String CMD_ENABLE_POLL = "enablepoll";
public static final String CMD_INDEX_VERSION = "indexversion";
public static final String CMD_SHOW_COMMITS = "commits";
public static final String CMD_DELETE_BACKUP = "deletebackup";
public static final String GENERATION = "generation";
public static final String OFFSET = "offset";
public static final String LEN = "len";
public static final String FILE = "file";
public static final String SIZE = "size";
public static final String MAX_WRITE_PER_SECOND = "maxWriteMBPerSec";
public static final String CONF_FILE_SHORT = "cf";
public static final String TLOG_FILE = "tlogFile";
public static final String CHECKSUM = "checksum";
public static final String ALIAS = "alias";
public static final String CONF_CHECKSUM = "confchecksum";
public static final String CONF_FILES = "confFiles";
public static final String TLOG_FILES = "tlogFiles";
public static final String REPLICATE_AFTER = "replicateAfter";
public static final String FILE_STREAM = "filestream";
public static final String POLL_INTERVAL = "pollInterval";
public static final String INTERVAL_ERR_MSG = "The " + POLL_INTERVAL + " must be in this format 'HH:mm:ss'";
private static final Pattern INTERVAL_PATTERN = Pattern.compile("(\\d*?):(\\d*?):(\\d*)");
public static final int PACKET_SZ = 1024 * 1024; // 1MB
public static final String RESERVE = "commitReserveDuration";
public static final String COMPRESSION = "compression";
public static final String EXTERNAL = "external";
public static final String INTERNAL = "internal";
public static final String ERR_STATUS = "ERROR";
public static final String OK_STATUS = "OK";
public static final String NEXT_EXECUTION_AT = "nextExecutionAt";
public static final String NUMBER_BACKUPS_TO_KEEP_REQUEST_PARAM = "numberToKeep";
public static final String NUMBER_BACKUPS_TO_KEEP_INIT_PARAM = "maxNumberOfBackups";
/**
* Boolean param for tests that can be specified when using
* {@link #CMD_FETCH_INDEX} to force the current request to block until
* the fetch is complete. NOTE: This param is not advised for
* non-test code, since the the duration of the fetch for non-trivial
* indexes will likeley cause the request to time out.
*
* @lucene.internal
*/
public static final String WAIT = "wait";
}
