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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.hadoop.hbase.wal;
import static org.apache.hadoop.hbase.wal.WALSplitUtil.getCompletedRecoveredEditsFilePath;
import static org.apache.hadoop.hbase.wal.WALSplitUtil.getRegionSplitEditsPath;
import java.io.EOFException;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletionService;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.log.HBaseMarkers;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.FSUtils;
import org.apache.hadoop.hbase.util.Threads;
import org.apache.hadoop.io.MultipleIOException;
import org.apache.hadoop.ipc.RemoteException;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;
import org.apache.hbase.thirdparty.com.google.common.collect.Lists;
import org.apache.hbase.thirdparty.org.apache.commons.collections4.CollectionUtils;
import org.apache.hbase.thirdparty.org.apache.commons.collections4.MapUtils;
/**
* Class that manages the output streams from the log splitting process.
*/
@InterfaceAudience.Private
public class LogRecoveredEditsOutputSink extends OutputSink {
private static final Logger LOG = LoggerFactory.getLogger(LogRecoveredEditsOutputSink.class);
private WALSplitter walSplitter;
private FileSystem walFS;
private Configuration conf;
public LogRecoveredEditsOutputSink(WALSplitter walSplitter,
WALSplitter.PipelineController controller, EntryBuffers entryBuffers, int numWriters) {
// More threads could potentially write faster at the expense
// of causing more disk seeks as the logs are split.
// 3. After a certain setting (probably around 3) the
// process will be bound on the reader in the current
// implementation anyway.
super(controller, entryBuffers, numWriters);
this.walSplitter = walSplitter;
this.walFS = walSplitter.walFS;
this.conf = walSplitter.conf;
}
/**
* @return null if failed to report progress
*/
@Override
public List finishWritingAndClose() throws IOException {
boolean isSuccessful = false;
List result = null;
try {
isSuccessful = finishWriting(false);
} finally {
result = close();
List thrown = closeLogWriters(null);
if (CollectionUtils.isNotEmpty(thrown)) {
throw MultipleIOException.createIOException(thrown);
}
}
if (isSuccessful) {
splits = result;
}
return splits;
}
// delete the one with fewer wal entries
private void deleteOneWithFewerEntries(WALSplitter.WriterAndPath wap, Path dst)
throws IOException {
long dstMinLogSeqNum = -1L;
try (WAL.Reader reader = walSplitter.getWalFactory().createReader(walSplitter.walFS, dst)) {
WAL.Entry entry = reader.next();
if (entry != null) {
dstMinLogSeqNum = entry.getKey().getSequenceId();
}
} catch (EOFException e) {
LOG.debug("Got EOF when reading first WAL entry from {}, an empty or broken WAL file?", dst,
e);
}
if (wap.minLogSeqNum < dstMinLogSeqNum) {
final String errorMsg =
"Found existing old edits file. It could be the result of a previous failed"
+ " split attempt or we have duplicated wal entries. Deleting " + dst + ", length="
+ walFS.getFileStatus(dst).getLen();
LOG.warn(errorMsg);
updateStatusWithMsg(errorMsg);
if (!walFS.delete(dst, false)) {
final String msg = "Failed deleting of old " + dst;
LOG.warn(msg);
updateStatusWithMsg(msg);
throw new IOException("Failed deleting of old " + dst);
}
} else {
final String errorMsg =
"Found existing old edits file and we have less entries. Deleting " + wap.path
+ ", length=" + walFS.getFileStatus(wap.path).getLen();
LOG.warn(errorMsg);
updateStatusWithMsg(errorMsg);
if (!walFS.delete(wap.path, false)) {
final String msg = "Failed deleting of " + wap.path;
LOG.warn(msg);
updateStatusWithMsg(msg);
throw new IOException(msg);
}
}
}
/**
* Close all of the output streams.
* @return the list of paths written.
*/
List close() throws IOException {
Preconditions.checkState(!closeAndCleanCompleted);
final List paths = new ArrayList<>();
final List thrown = Lists.newArrayList();
ThreadPoolExecutor closeThreadPool =
Threads.getBoundedCachedThreadPool(numThreads, 30L, TimeUnit.SECONDS, new ThreadFactory() {
private int count = 1;
@Override
public Thread newThread(Runnable r) {
Thread t = new Thread(r, "split-log-closeStream-" + count++);
return t;
}
});
CompletionService completionService = new ExecutorCompletionService<>(closeThreadPool);
boolean progress_failed;
try {
progress_failed = executeCloseTask(completionService, thrown, paths);
} catch (InterruptedException e) {
IOException iie = new InterruptedIOException();
iie.initCause(e);
throw iie;
} catch (ExecutionException e) {
throw new IOException(e.getCause());
} finally {
closeThreadPool.shutdownNow();
}
if (!thrown.isEmpty()) {
throw MultipleIOException.createIOException(thrown);
}
writersClosed = true;
closeAndCleanCompleted = true;
if (progress_failed) {
return null;
}
return paths;
}
/**
* @param completionService threadPool to execute the closing tasks
* @param thrown store the exceptions
* @param paths arrayList to store the paths written
* @return if close tasks executed successful
*/
boolean executeCloseTask(CompletionService completionService, List thrown,
List paths) throws InterruptedException, ExecutionException {
for (final Map.Entry writersEntry : writers.entrySet()) {
if (LOG.isTraceEnabled()) {
LOG.trace(
"Submitting close of " + ((WALSplitter.WriterAndPath) writersEntry.getValue()).path);
}
completionService.submit(new Callable() {
@Override
public Void call() throws Exception {
WALSplitter.WriterAndPath wap = (WALSplitter.WriterAndPath) writersEntry.getValue();
Path dst = closeWriter(writersEntry.getKey(), wap, thrown);
paths.add(dst);
return null;
}
});
}
boolean progress_failed = false;
for (int i = 0, n = this.writers.size(); i < n; i++) {
Future future = completionService.take();
future.get();
if (!progress_failed && reporter != null && !reporter.progress()) {
progress_failed = true;
}
}
return progress_failed;
}
Path closeWriter(String encodedRegionName, WALSplitter.WriterAndPath wap,
List thrown) throws IOException {
LOG.trace("Closing {}", wap.path);
try {
wap.writer.close();
} catch (IOException ioe) {
final String errorMsg = "Could not close log at " + wap.path;
LOG.error(errorMsg, ioe);
updateStatusWithMsg(errorMsg);
thrown.add(ioe);
return null;
}
final String updateLog =
"Closed wap " + wap.path + " (wrote " + wap.editsWritten + " edits, skipped "
+ wap.editsSkipped + " edits in " + (wap.nanosSpent / 1000 / 1000) + "ms";
if (LOG.isDebugEnabled()) {
LOG.debug(updateLog);
}
updateStatusWithMsg(updateLog);
if (wap.editsWritten == 0) {
// just remove the empty recovered.edits file
if (walFS.exists(wap.path) && !walFS.delete(wap.path, false)) {
final String errorMsg = "Failed deleting empty " + wap.path;
LOG.warn(errorMsg);
updateStatusWithMsg(errorMsg);
throw new IOException(errorMsg);
}
return null;
}
Path dst = getCompletedRecoveredEditsFilePath(wap.path,
regionMaximumEditLogSeqNum.get(encodedRegionName));
try {
if (!dst.equals(wap.path) && walFS.exists(dst)) {
deleteOneWithFewerEntries(wap, dst);
}
// Skip the unit tests which create a splitter that reads and
// writes the data without touching disk.
// TestHLogSplit#testThreading is an example.
if (walFS.exists(wap.path)) {
if (!walFS.rename(wap.path, dst)) {
final String errorMsg = "Failed renaming " + wap.path + " to " + dst;
updateStatusWithMsg(errorMsg);
throw new IOException(errorMsg);
}
final String msg = "Rename " + wap.path + " to " + dst;
LOG.info(msg);
updateStatusWithMsg(msg);
}
} catch (IOException ioe) {
LOG.error("Could not rename {} to {}", wap.path, dst, ioe);
thrown.add(ioe);
return null;
}
return dst;
}
private List closeLogWriters(List thrown) throws IOException {
if (writersClosed) {
return thrown;
}
if (thrown == null) {
thrown = Lists.newArrayList();
}
try {
for (WriterThread writerThread : writerThreads) {
while (writerThread.isAlive()) {
writerThread.setShouldStop(true);
writerThread.interrupt();
try {
writerThread.join(10);
} catch (InterruptedException e) {
IOException iie = new InterruptedIOException();
iie.initCause(e);
throw iie;
}
}
}
} finally {
WALSplitter.WriterAndPath wap = null;
for (WALSplitter.SinkWriter tmpWAP : writers.values()) {
try {
wap = (WALSplitter.WriterAndPath) tmpWAP;
wap.writer.close();
} catch (IOException ioe) {
final String errorMsg = "Couldn't close log at " + wap.path;
LOG.error(errorMsg, ioe);
updateStatusWithMsg(errorMsg);
thrown.add(ioe);
continue;
}
final String msg = "Closed log " + wap.path + " (wrote " + wap.editsWritten + " edits in "
+ (wap.nanosSpent / 1000 / 1000) + "ms)";
LOG.info(msg);
updateStatusWithMsg(msg);
}
writersClosed = true;
}
return thrown;
}
/**
* Get a writer and path for a log starting at the given entry. This function is threadsafe so
* long as multiple threads are always acting on different regions.
* @return null if this region shouldn't output any logs
*/
WALSplitter.WriterAndPath getWriterAndPath(WAL.Entry entry, boolean reusable) throws IOException {
byte[] region = entry.getKey().getEncodedRegionName();
String regionName = Bytes.toString(region);
WALSplitter.WriterAndPath ret = (WALSplitter.WriterAndPath) writers.get(regionName);
if (ret != null) {
return ret;
}
// If we already decided that this region doesn't get any output
// we don't need to check again.
if (blacklistedRegions.contains(region)) {
return null;
}
ret = createWAP(region, entry);
if (ret == null) {
blacklistedRegions.add(region);
return null;
}
if (reusable) {
writers.put(regionName, ret);
}
return ret;
}
/**
* @return a path with a write for that path. caller should close.
*/
WALSplitter.WriterAndPath createWAP(byte[] region, WAL.Entry entry) throws IOException {
String tmpDirName = walSplitter.conf.get(HConstants.TEMPORARY_FS_DIRECTORY_KEY,
HConstants.DEFAULT_TEMPORARY_HDFS_DIRECTORY);
Path regionedits = getRegionSplitEditsPath(entry,
walSplitter.getFileBeingSplit().getPath().getName(), tmpDirName, conf);
if (regionedits == null) {
return null;
}
FileSystem walFs = FSUtils.getWALFileSystem(conf);
if (walFs.exists(regionedits)) {
final String errorMsg = "Found old edits file. It could be the "
+ "result of a previous failed split attempt. Deleting " + regionedits + ", length="
+ walFs.getFileStatus(regionedits).getLen();
LOG.warn(errorMsg);
updateStatusWithMsg(errorMsg);
if (!walFs.delete(regionedits, false)) {
final String failureMsg = "Failed delete of old " + regionedits;
LOG.warn(failureMsg);
updateStatusWithMsg(failureMsg);
}
}
WALProvider.Writer w = walSplitter.createWriter(regionedits);
final String msg = "Creating writer path=" + regionedits;
LOG.debug(msg);
updateStatusWithMsg(msg);
return new WALSplitter.WriterAndPath(regionedits, w, entry.getKey().getSequenceId());
}
void filterCellByStore(WAL.Entry logEntry) {
Map maxSeqIdInStores = walSplitter.getRegionMaxSeqIdInStores()
.get(Bytes.toString(logEntry.getKey().getEncodedRegionName()));
if (MapUtils.isEmpty(maxSeqIdInStores)) {
return;
}
// Create the array list for the cells that aren't filtered.
// We make the assumption that most cells will be kept.
ArrayList keptCells = new ArrayList<>(logEntry.getEdit().getCells().size());
for (Cell cell : logEntry.getEdit().getCells()) {
if (WALEdit.isMetaEditFamily(cell)) {
keptCells.add(cell);
} else {
byte[] family = CellUtil.cloneFamily(cell);
Long maxSeqId = maxSeqIdInStores.get(family);
// Do not skip cell even if maxSeqId is null. Maybe we are in a rolling upgrade,
// or the master was crashed before and we can not get the information.
if (maxSeqId == null || maxSeqId.longValue() < logEntry.getKey().getSequenceId()) {
keptCells.add(cell);
}
}
}
// Anything in the keptCells array list is still live.
// So rather than removing the cells from the array list
// which would be an O(n^2) operation, we just replace the list
logEntry.getEdit().setCells(keptCells);
}
@Override
public void append(WALSplitter.RegionEntryBuffer buffer) throws IOException {
appendBuffer(buffer, true);
}
WALSplitter.WriterAndPath appendBuffer(WALSplitter.RegionEntryBuffer buffer, boolean reusable)
throws IOException {
List entries = buffer.entryBuffer;
if (entries.isEmpty()) {
LOG.warn("got an empty buffer, skipping");
return null;
}
WALSplitter.WriterAndPath wap = null;
long startTime = System.nanoTime();
int editsCount = 0;
for (WAL.Entry logEntry : entries) {
try {
if (wap == null) {
wap = getWriterAndPath(logEntry, reusable);
if (wap == null) {
// This log spews the full edit. Can be massive in the log. Enable only debugging
// WAL lost edit issues.
LOG.trace("getWriterAndPath decided we don't need to write edits for {}", logEntry);
return null;
}
}
filterCellByStore(logEntry);
if (!logEntry.getEdit().isEmpty()) {
wap.writer.append(logEntry);
this.updateRegionMaximumEditLogSeqNum(logEntry);
editsCount++;
} else {
wap.incrementSkippedEdits(1);
}
} catch (IOException e) {
return logAndThrowWriterAppendFailure(logEntry, e);
}
}
// Pass along summary statistics
wap.incrementEdits(editsCount);
wap.incrementNanoTime(System.nanoTime() - startTime);
return wap;
}
private WALSplitter.WriterAndPath logAndThrowWriterAppendFailure(WAL.Entry logEntry,
IOException e) throws IOException {
e = e instanceof RemoteException ? ((RemoteException) e).unwrapRemoteException() : e;
final String errorMsg = "Failed to write log entry " + logEntry.toString() + " to log";
LOG.error(HBaseMarkers.FATAL, errorMsg, e);
updateStatusWithMsg(errorMsg);
throw e;
}
@Override
public boolean keepRegionEvent(WAL.Entry entry) {
ArrayList cells = entry.getEdit().getCells();
for (Cell cell : cells) {
if (WALEdit.isCompactionMarker(cell)) {
return true;
}
}
return false;
}
/**
* @return a map from encoded region ID to the number of edits written out for that region.
*/
@Override
public Map getOutputCounts() {
TreeMap ret = new TreeMap<>(Bytes.BYTES_COMPARATOR);
for (Map.Entry entry : writers.entrySet()) {
ret.put(Bytes.toBytes(entry.getKey()), entry.getValue().editsWritten);
}
return ret;
}
@Override
public int getNumberOfRecoveredRegions() {
return writers.size();
}
}
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