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/*
* Licensed to ElasticSearch and Shay Banon 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.action.support.replication;
import org.elasticsearch.ElasticSearchException;
import org.elasticsearch.ElasticSearchIllegalStateException;
import org.elasticsearch.ExceptionsHelper;
import org.elasticsearch.action.*;
import org.elasticsearch.action.support.TransportAction;
import org.elasticsearch.cluster.ClusterChangedEvent;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.TimeoutClusterStateListener;
import org.elasticsearch.cluster.action.shard.ShardStateAction;
import org.elasticsearch.cluster.block.ClusterBlockException;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.routing.ShardIterator;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Streamable;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.IndexShardMissingException;
import org.elasticsearch.index.engine.DocumentAlreadyExistsException;
import org.elasticsearch.index.engine.VersionConflictEngineException;
import org.elasticsearch.index.shard.IllegalIndexShardStateException;
import org.elasticsearch.indices.IndexMissingException;
import org.elasticsearch.indices.IndicesService;
import org.elasticsearch.node.NodeClosedException;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.*;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import static org.elasticsearch.ExceptionsHelper.detailedMessage;
/**
*/
public abstract class TransportShardReplicationOperationAction extends TransportAction {
protected final TransportService transportService;
protected final ClusterService clusterService;
protected final IndicesService indicesService;
protected final ShardStateAction shardStateAction;
protected final ReplicationType defaultReplicationType;
protected final WriteConsistencyLevel defaultWriteConsistencyLevel;
protected final TransportRequestOptions transportOptions;
final String transportAction;
final String transportReplicaAction;
final String executor;
final boolean checkWriteConsistency;
protected TransportShardReplicationOperationAction(Settings settings, TransportService transportService,
ClusterService clusterService, IndicesService indicesService,
ThreadPool threadPool, ShardStateAction shardStateAction) {
super(settings, threadPool);
this.transportService = transportService;
this.clusterService = clusterService;
this.indicesService = indicesService;
this.shardStateAction = shardStateAction;
this.transportAction = transportAction();
this.transportReplicaAction = transportReplicaAction();
this.executor = executor();
this.checkWriteConsistency = checkWriteConsistency();
transportService.registerHandler(transportAction, new OperationTransportHandler());
transportService.registerHandler(transportReplicaAction, new ReplicaOperationTransportHandler());
this.transportOptions = transportOptions();
this.defaultReplicationType = ReplicationType.fromString(settings.get("action.replication_type", "sync"));
this.defaultWriteConsistencyLevel = WriteConsistencyLevel.fromString(settings.get("action.write_consistency", "quorum"));
}
@Override
protected void doExecute(Request request, ActionListener listener) {
new AsyncShardOperationAction(request, listener).start();
}
protected abstract Request newRequestInstance();
protected abstract ReplicaRequest newReplicaRequestInstance();
protected abstract Response newResponseInstance();
protected abstract String transportAction();
protected abstract String executor();
protected abstract PrimaryResponse shardOperationOnPrimary(ClusterState clusterState, PrimaryOperationRequest shardRequest);
protected abstract void shardOperationOnReplica(ReplicaOperationRequest shardRequest);
/**
* Called once replica operations have been dispatched on the
*/
protected void postPrimaryOperation(Request request, PrimaryResponse response) {
}
protected abstract ShardIterator shards(ClusterState clusterState, Request request) throws ElasticSearchException;
protected abstract boolean checkWriteConsistency();
protected abstract ClusterBlockException checkGlobalBlock(ClusterState state, Request request);
protected abstract ClusterBlockException checkRequestBlock(ClusterState state, Request request);
/**
* Resolves the request, by default, simply setting the concrete index (if its aliased one). If the resolve
* means a different execution, then return false here to indicate not to continue and execute this request.
*/
protected boolean resolveRequest(ClusterState state, Request request, ActionListener listener) {
request.index(state.metaData().concreteIndex(request.index()));
return true;
}
protected TransportRequestOptions transportOptions() {
return TransportRequestOptions.EMPTY;
}
/**
* Should the operations be performed on the replicas as well. Defaults to false meaning operations
* will be executed on the replica.
*/
protected boolean ignoreReplicas() {
return false;
}
private String transportReplicaAction() {
return transportAction() + "/replica";
}
protected boolean retryPrimaryException(Throwable e) {
Throwable cause = ExceptionsHelper.unwrapCause(e);
return cause instanceof IndexShardMissingException ||
cause instanceof IllegalIndexShardStateException ||
cause instanceof IndexMissingException;
}
/**
* Should an exception be ignored when the operation is performed on the replica.
*/
boolean ignoreReplicaException(Throwable e) {
Throwable cause = ExceptionsHelper.unwrapCause(e);
if (cause instanceof IllegalIndexShardStateException) {
return true;
}
if (cause instanceof IndexMissingException) {
return true;
}
if (cause instanceof IndexShardMissingException) {
return true;
}
if (cause instanceof ConnectTransportException) {
return true;
}
// on version conflict or document missing, it means
// that a news change has crept into the replica, and its fine
if (cause instanceof VersionConflictEngineException) {
return true;
}
// same here
if (cause instanceof DocumentAlreadyExistsException) {
return true;
}
return false;
}
class OperationTransportHandler extends BaseTransportRequestHandler {
@Override
public Request newInstance() {
return newRequestInstance();
}
@Override
public String executor() {
return ThreadPool.Names.SAME;
}
@Override
public void messageReceived(final Request request, final TransportChannel channel) throws Exception {
// no need to have a threaded listener since we just send back a response
request.listenerThreaded(false);
// if we have a local operation, execute it on a thread since we don't spawn
request.operationThreaded(true);
execute(request, new ActionListener() {
@Override
public void onResponse(Response result) {
try {
channel.sendResponse(result);
} catch (Throwable e) {
onFailure(e);
}
}
@Override
public void onFailure(Throwable e) {
try {
channel.sendResponse(e);
} catch (Exception e1) {
logger.warn("Failed to send response for " + transportAction, e1);
}
}
});
}
}
class ReplicaOperationTransportHandler extends BaseTransportRequestHandler {
@Override
public ReplicaOperationRequest newInstance() {
return new ReplicaOperationRequest();
}
@Override
public String executor() {
return executor;
}
@Override
public void messageReceived(final ReplicaOperationRequest request, final TransportChannel channel) throws Exception {
shardOperationOnReplica(request);
channel.sendResponse(TransportResponse.Empty.INSTANCE);
}
}
protected class PrimaryOperationRequest implements Streamable {
public int shardId;
public Request request;
public PrimaryOperationRequest() {
}
public PrimaryOperationRequest(int shardId, Request request) {
this.shardId = shardId;
this.request = request;
}
@Override
public void readFrom(StreamInput in) throws IOException {
shardId = in.readVInt();
request = newRequestInstance();
request.readFrom(in);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeVInt(shardId);
request.writeTo(out);
}
}
protected class ReplicaOperationRequest extends TransportRequest {
public int shardId;
public ReplicaRequest request;
public ReplicaOperationRequest() {
}
public ReplicaOperationRequest(int shardId, ReplicaRequest request) {
super(request);
this.shardId = shardId;
this.request = request;
}
@Override
public void readFrom(StreamInput in) throws IOException {
super.readFrom(in);
shardId = in.readVInt();
request = newReplicaRequestInstance();
request.readFrom(in);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
super.writeTo(out);
out.writeVInt(shardId);
request.writeTo(out);
}
}
protected class AsyncShardOperationAction {
private final ActionListener listener;
private final Request request;
private ClusterState clusterState;
private ShardIterator shardIt;
private final AtomicBoolean primaryOperationStarted = new AtomicBoolean();
private final ReplicationType replicationType;
AsyncShardOperationAction(Request request, ActionListener listener) {
this.request = request;
this.listener = listener;
if (request.replicationType() != ReplicationType.DEFAULT) {
replicationType = request.replicationType();
} else {
replicationType = defaultReplicationType;
}
}
public void start() {
start(false);
}
/**
* Returns true if the action starting to be performed on the primary (or is done).
*/
public boolean start(final boolean fromClusterEvent) throws ElasticSearchException {
this.clusterState = clusterService.state();
try {
ClusterBlockException blockException = checkGlobalBlock(clusterState, request);
if (blockException != null) {
if (blockException.retryable()) {
retry(fromClusterEvent, blockException);
return false;
} else {
throw blockException;
}
}
// check if we need to execute, and if not, return
if (!resolveRequest(clusterState, request, listener)) {
return true;
}
blockException = checkRequestBlock(clusterState, request);
if (blockException != null) {
if (blockException.retryable()) {
retry(fromClusterEvent, blockException);
return false;
} else {
throw blockException;
}
}
shardIt = shards(clusterState, request);
} catch (Throwable e) {
listener.onFailure(e);
return true;
}
// no shardIt, might be in the case between index gateway recovery and shardIt initialization
if (shardIt.size() == 0) {
retry(fromClusterEvent, null);
return false;
}
boolean foundPrimary = false;
ShardRouting shardX;
while ((shardX = shardIt.nextOrNull()) != null) {
final ShardRouting shard = shardX;
// we only deal with primary shardIt here...
if (!shard.primary()) {
continue;
}
if (!shard.active() || !clusterState.nodes().nodeExists(shard.currentNodeId())) {
retry(fromClusterEvent, null);
return false;
}
// check here for consistency
if (checkWriteConsistency) {
WriteConsistencyLevel consistencyLevel = defaultWriteConsistencyLevel;
if (request.consistencyLevel() != WriteConsistencyLevel.DEFAULT) {
consistencyLevel = request.consistencyLevel();
}
int requiredNumber = 1;
if (consistencyLevel == WriteConsistencyLevel.QUORUM && shardIt.size() > 2) {
// only for more than 2 in the number of shardIt it makes sense, otherwise its 1 shard with 1 replica, quorum is 1 (which is what it is initialized to)
requiredNumber = (shardIt.size() / 2) + 1;
} else if (consistencyLevel == WriteConsistencyLevel.ALL) {
requiredNumber = shardIt.size();
}
if (shardIt.sizeActive() < requiredNumber) {
retry(fromClusterEvent, null);
return false;
}
}
if (!primaryOperationStarted.compareAndSet(false, true)) {
return true;
}
foundPrimary = true;
if (shard.currentNodeId().equals(clusterState.nodes().localNodeId())) {
if (request.operationThreaded()) {
request.beforeLocalFork();
threadPool.executor(executor).execute(new Runnable() {
@Override
public void run() {
performOnPrimary(shard.id(), fromClusterEvent, shard, clusterState);
}
});
} else {
performOnPrimary(shard.id(), fromClusterEvent, shard, clusterState);
}
} else {
DiscoveryNode node = clusterState.nodes().get(shard.currentNodeId());
transportService.sendRequest(node, transportAction, request, transportOptions, new BaseTransportResponseHandler() {
@Override
public Response newInstance() {
return newResponseInstance();
}
@Override
public String executor() {
return ThreadPool.Names.SAME;
}
@Override
public void handleResponse(Response response) {
listener.onResponse(response);
}
@Override
public void handleException(TransportException exp) {
// if we got disconnected from the node, or the node / shard is not in the right state (being closed)
if (exp.unwrapCause() instanceof ConnectTransportException || exp.unwrapCause() instanceof NodeClosedException ||
retryPrimaryException(exp)) {
primaryOperationStarted.set(false);
// we already marked it as started when we executed it (removed the listener) so pass false
// to re-add to the cluster listener
retry(false, null);
} else {
listener.onFailure(exp);
}
}
});
}
break;
}
// we won't find a primary if there are no shards in the shard iterator, retry...
if (!foundPrimary) {
retry(fromClusterEvent, null);
return false;
}
return true;
}
void retry(boolean fromClusterEvent, @Nullable final Throwable failure) {
if (!fromClusterEvent) {
// make it threaded operation so we fork on the discovery listener thread
request.beforeLocalFork();
request.operationThreaded(true);
clusterService.add(request.timeout(), new TimeoutClusterStateListener() {
@Override
public void postAdded() {
if (start(true)) {
// if we managed to start and perform the operation on the primary, we can remove this listener
clusterService.remove(this);
}
}
@Override
public void onClose() {
clusterService.remove(this);
listener.onFailure(new NodeClosedException(clusterState.nodes().localNode()));
}
@Override
public void clusterChanged(ClusterChangedEvent event) {
if (start(true)) {
// if we managed to start and perform the operation on the primary, we can remove this listener
clusterService.remove(this);
}
}
@Override
public void onTimeout(TimeValue timeValue) {
// just to be on the safe side, see if we can start it now?
if (start(true)) {
clusterService.remove(this);
return;
}
clusterService.remove(this);
Throwable listenerFailure = failure;
if (listenerFailure == null) {
if (shardIt == null) {
listenerFailure = new UnavailableShardsException(null, "no available shards: Timeout waiting for [" + timeValue + "], request: " + request.toString());
} else {
listenerFailure = new UnavailableShardsException(shardIt.shardId(), "[" + shardIt.size() + "] shardIt, [" + shardIt.sizeActive() + "] active : Timeout waiting for [" + timeValue + "], request: " + request.toString());
}
}
listener.onFailure(listenerFailure);
}
});
}
}
void performOnPrimary(int primaryShardId, boolean fromDiscoveryListener, final ShardRouting shard, ClusterState clusterState) {
try {
PrimaryResponse response = shardOperationOnPrimary(clusterState, new PrimaryOperationRequest(primaryShardId, request));
performReplicas(response);
} catch (Exception e) {
// shard has not been allocated yet, retry it here
if (retryPrimaryException(e)) {
primaryOperationStarted.set(false);
retry(fromDiscoveryListener, null);
return;
}
if (e instanceof ElasticSearchException && ((ElasticSearchException) e).status() == RestStatus.CONFLICT) {
if (logger.isTraceEnabled()) {
logger.trace(shard.shortSummary() + ": Failed to execute [" + request + "]", e);
}
} else {
if (logger.isDebugEnabled()) {
logger.debug(shard.shortSummary() + ": Failed to execute [" + request + "]", e);
}
}
listener.onFailure(e);
}
}
void performReplicas(final PrimaryResponse response) {
if (ignoreReplicas()) {
postPrimaryOperation(request, response);
listener.onResponse(response.response());
return;
}
ShardRouting shard;
// we double check on the state, if it got changed we need to make sure we take the latest one cause
// maybe a replica shard started its recovery process and we need to apply it there...
// we also need to make sure if the new state has a new primary shard (that we indexed to before) started
// and assigned to another node (while the indexing happened). In that case, we want to apply it on the
// new primary shard as well...
ClusterState newState = clusterService.state();
ShardRouting newPrimaryShard = null;
if (clusterState != newState) {
shardIt.reset();
ShardRouting originalPrimaryShard = null;
while ((shard = shardIt.nextOrNull()) != null) {
if (shard.primary()) {
originalPrimaryShard = shard;
break;
}
}
if (originalPrimaryShard == null || !originalPrimaryShard.active()) {
throw new ElasticSearchIllegalStateException("unexpected state, failed to find primary shard on an index operation that succeeded");
}
clusterState = newState;
shardIt = shards(newState, request);
while ((shard = shardIt.nextOrNull()) != null) {
if (shard.primary()) {
if (originalPrimaryShard.currentNodeId().equals(shard.currentNodeId())) {
newPrimaryShard = null;
} else {
newPrimaryShard = shard;
}
break;
}
}
}
// initialize the counter
int replicaCounter = shardIt.assignedReplicasIncludingRelocating();
if (newPrimaryShard != null) {
replicaCounter++;
}
if (replicaCounter == 0) {
postPrimaryOperation(request, response);
listener.onResponse(response.response());
return;
}
if (replicationType == ReplicationType.ASYNC) {
postPrimaryOperation(request, response);
// async replication, notify the listener
listener.onResponse(response.response());
// now, trick the counter so it won't decrease to 0 and notify the listeners
replicaCounter = Integer.MIN_VALUE;
}
// we add one to the replica count to do the postPrimaryOperation
replicaCounter++;
AtomicInteger counter = new AtomicInteger(replicaCounter);
if (newPrimaryShard != null) {
performOnReplica(response, counter, newPrimaryShard, newPrimaryShard.currentNodeId());
}
shardIt.reset(); // reset the iterator
while ((shard = shardIt.nextOrNull()) != null) {
// if its unassigned, nothing to do here...
if (shard.unassigned()) {
continue;
}
// if the shard is primary and relocating, add one to the counter since we perform it on the replica as well
// (and we already did it on the primary)
boolean doOnlyOnRelocating = false;
if (shard.primary()) {
if (shard.relocating()) {
doOnlyOnRelocating = true;
} else {
continue;
}
}
// we index on a replica that is initializing as well since we might not have got the event
// yet that it was started. We will get an exception IllegalShardState exception if its not started
// and that's fine, we will ignore it
if (!doOnlyOnRelocating) {
performOnReplica(response, counter, shard, shard.currentNodeId());
}
if (shard.relocating()) {
performOnReplica(response, counter, shard, shard.relocatingNodeId());
}
}
// now do the postPrimary operation, and check if the listener needs to be invoked
postPrimaryOperation(request, response);
// we also invoke here in case replicas finish before postPrimaryAction does
if (counter.decrementAndGet() == 0) {
listener.onResponse(response.response());
}
}
void performOnReplica(final PrimaryResponse response, final AtomicInteger counter, final ShardRouting shard, String nodeId) {
// if we don't have that node, it means that it might have failed and will be created again, in
// this case, we don't have to do the operation, and just let it failover
if (!clusterState.nodes().nodeExists(nodeId)) {
if (counter.decrementAndGet() == 0) {
listener.onResponse(response.response());
}
return;
}
final ReplicaOperationRequest shardRequest = new ReplicaOperationRequest(shardIt.shardId().id(), response.replicaRequest());
if (!nodeId.equals(clusterState.nodes().localNodeId())) {
DiscoveryNode node = clusterState.nodes().get(nodeId);
transportService.sendRequest(node, transportReplicaAction, shardRequest, transportOptions, new EmptyTransportResponseHandler(ThreadPool.Names.SAME) {
@Override
public void handleResponse(TransportResponse.Empty vResponse) {
finishIfPossible();
}
@Override
public void handleException(TransportException exp) {
if (!ignoreReplicaException(exp.unwrapCause())) {
logger.warn("Failed to perform " + transportAction + " on replica " + shardIt.shardId(), exp);
shardStateAction.shardFailed(shard, "Failed to perform [" + transportAction + "] on replica, message [" + detailedMessage(exp) + "]");
}
finishIfPossible();
}
private void finishIfPossible() {
if (counter.decrementAndGet() == 0) {
listener.onResponse(response.response());
}
}
});
} else {
if (request.operationThreaded()) {
request.beforeLocalFork();
threadPool.executor(executor).execute(new Runnable() {
@Override
public void run() {
try {
shardOperationOnReplica(shardRequest);
} catch (Exception e) {
if (!ignoreReplicaException(e)) {
logger.warn("Failed to perform " + transportAction + " on replica " + shardIt.shardId(), e);
shardStateAction.shardFailed(shard, "Failed to perform [" + transportAction + "] on replica, message [" + detailedMessage(e) + "]");
}
}
if (counter.decrementAndGet() == 0) {
listener.onResponse(response.response());
}
}
});
} else {
try {
shardOperationOnReplica(shardRequest);
} catch (Exception e) {
if (!ignoreReplicaException(e)) {
logger.warn("Failed to perform " + transportAction + " on replica" + shardIt.shardId(), e);
shardStateAction.shardFailed(shard, "Failed to perform [" + transportAction + "] on replica, message [" + detailedMessage(e) + "]");
}
}
if (counter.decrementAndGet() == 0) {
listener.onResponse(response.response());
}
}
}
}
}
public static class PrimaryResponse {
private final ReplicaRequest replicaRequest;
private final Response response;
private final Object payload;
public PrimaryResponse(ReplicaRequest replicaRequest, Response response, Object payload) {
this.replicaRequest = replicaRequest;
this.response = response;
this.payload = payload;
}
public ReplicaRequest replicaRequest() {
return this.replicaRequest;
}
public Response response() {
return response;
}
public Object payload() {
return payload;
}
}
}
