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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.schema;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.lang.invoke.MethodHandles;
import org.apache.commons.io.IOUtils;
import org.apache.solr.cloud.ZkController;
import org.apache.solr.cloud.ZkSolrResourceLoader;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.SolrException.ErrorCode;
import org.apache.solr.common.cloud.SolrZkClient;
import org.apache.solr.common.cloud.ZkCmdExecutor;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.common.util.NamedList;
import org.apache.solr.core.SolrConfig;
import org.apache.solr.core.SolrCore;
import org.apache.solr.core.SolrResourceLoader;
import org.apache.solr.util.SystemIdResolver;
import org.apache.solr.util.plugin.SolrCoreAware;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.data.Stat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.InputSource;
/** Factory for ManagedIndexSchema */
public class ManagedIndexSchemaFactory extends IndexSchemaFactory implements SolrCoreAware {
private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
private static final String UPGRADED_SCHEMA_EXTENSION = ".bak";
private static final String SCHEMA_DOT_XML = "schema.xml";
public static final String DEFAULT_MANAGED_SCHEMA_RESOURCE_NAME = "managed-schema";
public static final String MANAGED_SCHEMA_RESOURCE_NAME = "managedSchemaResourceName";
private boolean isMutable = true;
private String managedSchemaResourceName = DEFAULT_MANAGED_SCHEMA_RESOURCE_NAME;
public String getManagedSchemaResourceName() { return managedSchemaResourceName; }
private SolrConfig config;
private SolrResourceLoader loader;
public SolrResourceLoader getResourceLoader() { return loader; }
private String resourceName;
private ManagedIndexSchema schema;
private SolrCore core;
private ZkIndexSchemaReader zkIndexSchemaReader;
private String loadedResource;
private boolean shouldUpgrade = false;
@Override
public void init(NamedList args) {
SolrParams params = args.toSolrParams();
isMutable = params.getBool("mutable", true);
args.remove("mutable");
managedSchemaResourceName = params.get(MANAGED_SCHEMA_RESOURCE_NAME, DEFAULT_MANAGED_SCHEMA_RESOURCE_NAME);
args.remove(MANAGED_SCHEMA_RESOURCE_NAME);
if (SCHEMA_DOT_XML.equals(managedSchemaResourceName)) {
String msg = MANAGED_SCHEMA_RESOURCE_NAME + " can't be '" + SCHEMA_DOT_XML + "'";
log.error(msg);
throw new SolrException(ErrorCode.SERVER_ERROR, msg);
}
if (args.size() > 0) {
String msg = "Unexpected arg(s): " + args;
log.error(msg);
throw new SolrException(ErrorCode.SERVER_ERROR, msg);
}
}
/**
* First, try to locate the managed schema file named in the managedSchemaResourceName
* param. If the managed schema file exists and is accessible, it is used to instantiate
* an IndexSchema.
*
* If the managed schema file can't be found, the resource named by the resourceName
* parameter is used to instantiate an IndexSchema.
*
* Once the IndexSchema is instantiated, if the managed schema file does not exist,
* the instantiated IndexSchema is persisted to the managed schema file named in the
* managedSchemaResourceName param, in the directory given by
* {@link org.apache.solr.core.SolrResourceLoader#getConfigDir()}, or if configs are
* in ZooKeeper, under {@link org.apache.solr.cloud.ZkSolrResourceLoader#getConfigSetZkPath()}.
*
* After the managed schema file is persisted, the original schema file is
* renamed by appending the extension named in {@link #UPGRADED_SCHEMA_EXTENSION}.
*/
@Override
public ManagedIndexSchema create(String resourceName, SolrConfig config) {
this.resourceName = resourceName;
this.config = config;
this.loader = config.getResourceLoader();
InputStream schemaInputStream = null;
if (null == resourceName) {
resourceName = IndexSchema.DEFAULT_SCHEMA_FILE;
}
int schemaZkVersion = -1;
if ( ! (loader instanceof ZkSolrResourceLoader)) {
schemaInputStream = readSchemaLocally();
} else { // ZooKeeper
final ZkSolrResourceLoader zkLoader = (ZkSolrResourceLoader)loader;
final SolrZkClient zkClient = zkLoader.getZkController().getZkClient();
final String managedSchemaPath = zkLoader.getConfigSetZkPath() + "/" + managedSchemaResourceName;
Stat stat = new Stat();
try {
// Attempt to load the managed schema
byte[] data = zkClient.getData(managedSchemaPath, null, stat, true);
schemaZkVersion = stat.getVersion();
schemaInputStream = new ByteArrayInputStream(data);
loadedResource = managedSchemaResourceName;
warnIfNonManagedSchemaExists();
} catch (InterruptedException e) {
// Restore the interrupted status
Thread.currentThread().interrupt();
log.warn("", e);
} catch (KeeperException.NoNodeException e) {
log.info("The schema is configured as managed, but managed schema resource " + managedSchemaResourceName
+ " not found - loading non-managed schema " + resourceName + " instead");
} catch (KeeperException e) {
String msg = "Error attempting to access " + managedSchemaPath;
log.error(msg, e);
throw new SolrException(ErrorCode.SERVER_ERROR, msg, e);
}
if (null == schemaInputStream) {
// The managed schema file could not be found - load the non-managed schema
try {
schemaInputStream = loader.openSchema(resourceName);
loadedResource = resourceName;
shouldUpgrade = true;
} catch (Exception e) {
try {
// Retry to load the managed schema, in case it was created since the first attempt
byte[] data = zkClient.getData(managedSchemaPath, null, stat, true);
schemaZkVersion = stat.getVersion();
schemaInputStream = new ByteArrayInputStream(data);
loadedResource = managedSchemaPath;
warnIfNonManagedSchemaExists();
} catch (Exception e1) {
if (e1 instanceof InterruptedException) {
Thread.currentThread().interrupt(); // Restore the interrupted status
}
final String msg = "Error loading both non-managed schema '" + resourceName + "' and managed schema '"
+ managedSchemaResourceName + "'";
log.error(msg, e);
throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, msg, e);
}
}
}
}
InputSource inputSource = new InputSource(schemaInputStream);
inputSource.setSystemId(SystemIdResolver.createSystemIdFromResourceName(loadedResource));
schema = new ManagedIndexSchema(config, loadedResource, inputSource, isMutable,
managedSchemaResourceName, schemaZkVersion, getSchemaUpdateLock());
if (shouldUpgrade) {
// Persist the managed schema if it doesn't already exist
synchronized (schema.getSchemaUpdateLock()) {
upgradeToManagedSchema();
}
}
return schema;
}
private InputStream readSchemaLocally() {
InputStream schemaInputStream = null;
try {
// Attempt to load the managed schema
schemaInputStream = loader.openSchema(managedSchemaResourceName);
loadedResource = managedSchemaResourceName;
warnIfNonManagedSchemaExists();
} catch (IOException e) {
log.info("The schema is configured as managed, but managed schema resource " + managedSchemaResourceName
+ " not found - loading non-managed schema " + resourceName + " instead");
}
if (null == schemaInputStream) {
// The managed schema file could not be found - load the non-managed schema
try {
schemaInputStream = loader.openSchema(resourceName);
loadedResource = resourceName;
shouldUpgrade = true;
} catch (Exception e) {
final String msg = "Error loading both non-managed schema '" + resourceName + "' and managed schema '"
+ managedSchemaResourceName + "'";
log.error(msg, e);
throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, msg, e);
}
}
return schemaInputStream;
}
/**
* Return whether a non-managed schema exists, either in local storage or on ZooKeeper.
*/
private void warnIfNonManagedSchemaExists() {
if ( ! resourceName.equals(managedSchemaResourceName)) {
boolean exists = false;
SolrResourceLoader loader = config.getResourceLoader();
if (loader instanceof ZkSolrResourceLoader) {
ZkSolrResourceLoader zkLoader = (ZkSolrResourceLoader)loader;
String nonManagedSchemaPath = zkLoader.getConfigSetZkPath() + "/" + resourceName;
try {
exists = zkLoader.getZkController().pathExists(nonManagedSchemaPath);
} catch (InterruptedException e) {
Thread.currentThread().interrupt(); // Restore the interrupted status
log.warn("", e); // Log as warning and suppress the exception
} catch (KeeperException e) {
// log as warning and suppress the exception
log.warn("Error checking for the existence of the non-managed schema " + resourceName, e);
}
} else { // Config is not in ZooKeeper
InputStream nonManagedSchemaInputStream = null;
try {
nonManagedSchemaInputStream = loader.openSchema(resourceName);
if (null != nonManagedSchemaInputStream) {
exists = true;
}
} catch (IOException e) {
// This is expected when the non-managed schema does not exist
} finally {
IOUtils.closeQuietly(nonManagedSchemaInputStream);
}
}
if (exists) {
log.warn("The schema has been upgraded to managed, but the non-managed schema " + resourceName
+ " is still loadable. PLEASE REMOVE THIS FILE.");
}
}
}
/**
* Persist the managed schema and rename the non-managed schema
* by appending {@link #UPGRADED_SCHEMA_EXTENSION}.
*
* Failure to rename the non-managed schema will be logged as a warning,
* and no exception will be thrown.
*/
private void upgradeToManagedSchema() {
SolrResourceLoader loader = config.getResourceLoader();
if (loader instanceof ZkSolrResourceLoader) {
zkUgradeToManagedSchema();
} else {
// Configs are not on ZooKeeper
schema.persistManagedSchema(true); // Only create it - don't update it if it already exists
// After successfully persisting the managed schema, rename the non-managed
// schema file by appending UPGRADED_SCHEMA_EXTENSION to its name.
if (resourceName.equals(managedSchemaResourceName)) {
log.info("On upgrading to managed schema, did not rename non-managed schema '"
+ resourceName + "' because it's the same as the managed schema's name.");
} else {
final File nonManagedSchemaFile = locateConfigFile(resourceName);
if (null == nonManagedSchemaFile) {
// Don't throw an exception for failure to rename the non-managed schema
log.warn("On upgrading to managed schema, did not rename non-managed schema "
+ resourceName + " because it's neither an absolute file "
+ "nor under SolrConfig.getConfigDir() or the current directory."
+ " PLEASE REMOVE THIS FILE.");
} else {
File upgradedSchemaFile = new File(nonManagedSchemaFile + UPGRADED_SCHEMA_EXTENSION);
if (nonManagedSchemaFile.renameTo(upgradedSchemaFile)) {
// Set the resource name to the managed schema so that the CoreAdminHandler returns a findable filename
schema.setResourceName(managedSchemaResourceName);
log.info("After upgrading to managed schema, renamed the non-managed schema "
+ nonManagedSchemaFile + " to " + upgradedSchemaFile);
} else {
// Don't throw an exception for failure to rename the non-managed schema
log.warn("Can't rename " + nonManagedSchemaFile.toString() + " to "
+ upgradedSchemaFile.toString() + " - PLEASE REMOVE THIS FILE.");
}
}
}
}
}
/**
* Finds any resource by its name on the filesystem. The classpath is not consulted.
*
* If the resource is not absolute, the resource is sought in $configDir and then in the current directory.
*
*@return the File for the named resource, or null if it can't be found
*/
private File locateConfigFile(String resource) {
String location = config.getResourceLoader().resourceLocation(resource);
if (location.equals(resource) || location.startsWith("classpath:"))
return null;
return new File(location);
}
/**
* Persist the managed schema to ZooKeeper and rename the non-managed schema
* by appending {@link #UPGRADED_SCHEMA_EXTENSION}.
*
* Failure to rename the non-managed schema will be logged as a warning,
* and no exception will be thrown.
*/
private void zkUgradeToManagedSchema() {
schema.persistManagedSchemaToZooKeeper(true); // Only create, don't update it if it already exists
// After successfully persisting the managed schema, rename the non-managed
// schema znode by appending UPGRADED_SCHEMA_EXTENSION to its name.
if (resourceName.equals(managedSchemaResourceName)) {
log.info("On upgrading to managed schema, did not rename non-managed schema "
+ resourceName + " because it's the same as the managed schema's name.");
} else {
// Rename the non-managed schema znode in ZooKeeper
ZkSolrResourceLoader zkLoader = (ZkSolrResourceLoader)loader;
final String nonManagedSchemaPath = zkLoader.getConfigSetZkPath() + "/" + resourceName;
try {
ZkController zkController = zkLoader.getZkController();
ZkCmdExecutor zkCmdExecutor = new ZkCmdExecutor(zkController.getClientTimeout());
if (zkController.pathExists(nonManagedSchemaPath)) {
// First, copy the non-managed schema znode content to the upgraded schema znode
byte[] bytes = zkController.getZkClient().getData(nonManagedSchemaPath, null, null, true);
final String upgradedSchemaPath = nonManagedSchemaPath + UPGRADED_SCHEMA_EXTENSION;
zkCmdExecutor.ensureExists(upgradedSchemaPath, zkController.getZkClient());
zkController.getZkClient().setData(upgradedSchemaPath, bytes, true);
// Then delete the non-managed schema znode
if (zkController.getZkClient().exists(nonManagedSchemaPath, true)) {
try {
zkController.getZkClient().delete(nonManagedSchemaPath, -1, true);
} catch (KeeperException.NoNodeException ex) {
// ignore - someone beat us to it
}
}
// Set the resource name to the managed schema so that the CoreAdminHandler returns a findable filename
schema.setResourceName(managedSchemaResourceName);
log.info("After upgrading to managed schema in ZooKeeper, renamed the non-managed schema "
+ nonManagedSchemaPath + " to " + upgradedSchemaPath);
} else {
log.info("After upgrading to managed schema in ZooKeeper, the non-managed schema "
+ nonManagedSchemaPath + " no longer exists.");
}
} catch (Exception e) {
if (e instanceof InterruptedException) {
Thread.currentThread().interrupt(); // Restore the interrupted status
}
final String msg = "Error persisting managed schema resource " + managedSchemaResourceName;
log.warn(msg, e); // Log as warning and suppress the exception
}
}
}
private Object schemaUpdateLock = new Object();
public Object getSchemaUpdateLock() { return schemaUpdateLock; }
@Override
public void inform(SolrCore core) {
this.core = core;
if (loader instanceof ZkSolrResourceLoader) {
this.zkIndexSchemaReader = new ZkIndexSchemaReader(this, core);
ZkSolrResourceLoader zkLoader = (ZkSolrResourceLoader)loader;
zkLoader.setZkIndexSchemaReader(this.zkIndexSchemaReader);
try {
zkIndexSchemaReader.refreshSchemaFromZk(-1); // update immediately if newer is available
core.setLatestSchema(getSchema());
} catch (KeeperException e) {
String msg = "Error attempting to access " + zkLoader.getConfigSetZkPath() + "/" + managedSchemaResourceName;
log.error(msg, e);
throw new SolrException(ErrorCode.SERVER_ERROR, msg, e);
} catch (InterruptedException e) {
// Restore the interrupted status
Thread.currentThread().interrupt();
log.warn("", e);
}
} else {
this.zkIndexSchemaReader = null;
}
}
public ManagedIndexSchema getSchema() {
return schema;
}
public void setSchema(ManagedIndexSchema schema) {
this.schema = schema;
core.setLatestSchema(schema);
}
public boolean isMutable() {
return isMutable;
}
public SolrConfig getConfig() {
return config;
}
}