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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.index.shard;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.index.VersionType;
import org.elasticsearch.index.engine.Engine;
import org.elasticsearch.index.engine.IgnoreOnRecoveryEngineException;
import org.elasticsearch.index.mapper.DocumentMapperForType;
import org.elasticsearch.index.mapper.MapperException;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.Mapping;
import org.elasticsearch.index.mapper.Uid;
import org.elasticsearch.index.seqno.SequenceNumbersService;
import org.elasticsearch.index.translog.Translog;
import org.elasticsearch.rest.RestStatus;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import static org.elasticsearch.index.mapper.SourceToParse.source;
/**
* The TranslogRecoveryPerformer encapsulates all the logic needed to transform a translog entry into an
* indexing operation including source parsing and field creation from the source.
*/
public class TranslogRecoveryPerformer {
private final MapperService mapperService;
private final Logger logger;
private final Map<String, Mapping> recoveredTypes = new HashMap<>();
private final ShardId shardId;
protected TranslogRecoveryPerformer(ShardId shardId, MapperService mapperService, Logger logger) {
this.shardId = shardId;
this.mapperService = mapperService;
this.logger = logger;
}
protected DocumentMapperForType docMapper(String type) {
return mapperService.documentMapperWithAutoCreate(type); // protected for testing
}
/**
* Applies all operations in the iterable to the current engine and returns the number of operations applied.
* This operation will stop applying operations once an operation failed to apply.
*
* Throws a {@link MapperException} to be thrown if a mapping update is encountered.
*/
int performBatchRecovery(Engine engine, Iterable<Translog.Operation> operations) {
int numOps = 0;
try {
for (Translog.Operation operation : operations) {
performRecoveryOperation(engine, operation, false, Engine.Operation.Origin.PEER_RECOVERY);
numOps++;
}
engine.getTranslog().sync();
} catch (Exception e) {
throw new BatchOperationException(shardId, "failed to apply batch translog operation", numOps, e);
}
return numOps;
}
public int recoveryFromSnapshot(Engine engine, Translog.Snapshot snapshot) throws IOException {
Translog.Operation operation;
int opsRecovered = 0;
while ((operation = snapshot.next()) != null) {
try {
performRecoveryOperation(engine, operation, true, Engine.Operation.Origin.LOCAL_TRANSLOG_RECOVERY);
opsRecovered++;
} catch (ElasticsearchException e) {
if (e.status() == RestStatus.BAD_REQUEST) {
// mainly for MapperParsingException and Failure to detect xcontent
logger.info("ignoring recovery of a corrupt translog entry", e);
} else {
throw e;
}
}
}
return opsRecovered;
}
public static class BatchOperationException extends ElasticsearchException {
private final int completedOperations;
public BatchOperationException(ShardId shardId, String msg, int completedOperations, Throwable cause) {
super(msg, cause);
setShard(shardId);
this.completedOperations = completedOperations;
}
public BatchOperationException(StreamInput in) throws IOException{
super(in);
completedOperations = in.readInt();
}
@Override
public void writeTo(StreamOutput out) throws IOException {
super.writeTo(out);
out.writeInt(completedOperations);
}
/** the number of succesful operations performed before the exception was thrown */
public int completedOperations() {
return completedOperations;
}
}
private void maybeAddMappingUpdate(String type, Mapping update, String docId, boolean allowMappingUpdates) {
if (update == null) {
return;
}
if (allowMappingUpdates == false) {
throw new MapperException("mapping updates are not allowed (type: [" + type + "], id: [" + docId + "])");
}
Mapping currentUpdate = recoveredTypes.get(type);
if (currentUpdate == null) {
recoveredTypes.put(type, update);
} else {
currentUpdate = currentUpdate.merge(update, false);
}
}
/**
* Performs a single recovery operation.
*
* @param allowMappingUpdates true if mapping update should be accepted (but collected). Setting it to false will
* cause a {@link MapperException} to be thrown if an update
* is encountered.
*/
private void performRecoveryOperation(Engine engine, Translog.Operation operation, boolean allowMappingUpdates, Engine.Operation.Origin origin) throws IOException {
try {
switch (operation.opType()) {
case INDEX:
Translog.Index index = (Translog.Index) operation;
// we set canHaveDuplicates to true all the time such that we de-optimze the translog case and ensure that all
// autoGeneratedID docs that are coming from the primary are updated correctly.
Engine.Index engineIndex = IndexShard.prepareIndex(docMapper(index.type()),
source(shardId.getIndexName(), index.type(), index.id(), index.source(), XContentFactory.xContentType(index.source()))
.routing(index.routing()).parent(index.parent()), index.seqNo(), index.primaryTerm(),
index.version(), index.versionType().versionTypeForReplicationAndRecovery(), origin, index.getAutoGeneratedIdTimestamp(), true);
maybeAddMappingUpdate(engineIndex.type(), engineIndex.parsedDoc().dynamicMappingsUpdate(), engineIndex.id(), allowMappingUpdates);
logger.trace("[translog] recover [index] op [({}, {})] of [{}][{}]", index.seqNo(), index.primaryTerm(), index.type(), index.id());
index(engine, engineIndex);
break;
case DELETE:
Translog.Delete delete = (Translog.Delete) operation;
Uid uid = Uid.createUid(delete.uid().text());
logger.trace("[translog] recover [delete] op [({}, {})] of [{}][{}]", delete.seqNo(), delete.primaryTerm(), uid.type(), uid.id());
final Engine.Delete engineDelete = new Engine.Delete(uid.type(), uid.id(), delete.uid(), delete.seqNo(),
delete.primaryTerm(), delete.version(), delete.versionType().versionTypeForReplicationAndRecovery(),
origin, System.nanoTime());
delete(engine, engineDelete);
break;
case NO_OP:
final Translog.NoOp noOp = (Translog.NoOp) operation;
final long seqNo = noOp.seqNo();
final long primaryTerm = noOp.primaryTerm();
final String reason = noOp.reason();
logger.trace("[translog] recover [no_op] op [({}, {})] of [{}]", seqNo, primaryTerm, reason);
final Engine.NoOp engineNoOp =
new Engine.NoOp(null, seqNo, primaryTerm, 0, VersionType.INTERNAL, origin, System.nanoTime(), reason);
noOp(engine, engineNoOp);
break;
default:
throw new IllegalStateException("No operation defined for [" + operation + "]");
}
} catch (ElasticsearchException e) {
boolean hasIgnoreOnRecoveryException = false;
ElasticsearchException current = e;
while (true) {
if (current instanceof IgnoreOnRecoveryEngineException) {
hasIgnoreOnRecoveryException = true;
break;
}
if (current.getCause() instanceof ElasticsearchException) {
current = (ElasticsearchException) current.getCause();
} else {
break;
}
}
if (!hasIgnoreOnRecoveryException) {
throw e;
}
}
operationProcessed();
}
protected void index(Engine engine, Engine.Index engineIndex) throws IOException {
engine.index(engineIndex);
}
protected void delete(Engine engine, Engine.Delete engineDelete) throws IOException {
engine.delete(engineDelete);
}
protected void noOp(Engine engine, Engine.NoOp engineNoOp) {
engine.noOp(engineNoOp);
}
/**
* Called once for every processed operation by this recovery performer.
* This can be used to get progress information on the translog execution.
*/
protected void operationProcessed() {
// noop
}
/**
* Returns the recovered types modifying the mapping during the recovery
*/
public Map<String, Mapping> getRecoveredTypes() {
return recoveredTypes;
}
}
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