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* the Apache License, Version 2.0 (the "License"); you may
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* 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
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* specific language governing permissions and limitations
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package org.elasticsearch.action.bulk;
import org.elasticsearch.ExceptionsHelper;
import org.elasticsearch.action.ActionFuture;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.support.PlainActionFuture;
import org.elasticsearch.client.Client;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.Loggers;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.util.concurrent.FutureUtils;
import org.elasticsearch.threadpool.ThreadPool;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.*;
/**
* Encapsulates synchronous and asynchronous retry logic. While this was designed for use with BulkProcessor it is public so it can be used
* by other code. Specifically it is used by the reindex module.
*/
public class Retry {
private final Class retryOnThrowable;
private BackoffPolicy backoffPolicy;
public static Retry on(Class retryOnThrowable) {
return new Retry(retryOnThrowable);
}
/**
* @param backoffPolicy The backoff policy that defines how long and how often to wait for retries.
*/
public Retry policy(BackoffPolicy backoffPolicy) {
this.backoffPolicy = backoffPolicy;
return this;
}
Retry(Class retryOnThrowable) {
this.retryOnThrowable = retryOnThrowable;
}
/**
* Invokes #bulk(BulkRequest, ActionListener) on the provided client. Backs off on the provided exception and delegates results to the
* provided listener.
*
* @param client Client invoking the bulk request.
* @param bulkRequest The bulk request that should be executed.
* @param listener A listener that is invoked when the bulk request finishes or completes with an exception. The listener is not
*/
public void withAsyncBackoff(Client client, BulkRequest bulkRequest, ActionListener listener) {
AsyncRetryHandler r = new AsyncRetryHandler(retryOnThrowable, backoffPolicy, client, listener);
r.execute(bulkRequest);
}
/**
* Invokes #bulk(BulkRequest) on the provided client. Backs off on the provided exception.
*
* @param client Client invoking the bulk request.
* @param bulkRequest The bulk request that should be executed.
* @return the bulk response as returned by the client.
* @throws Exception Any exception thrown by the callable.
*/
public BulkResponse withSyncBackoff(Client client, BulkRequest bulkRequest) throws Exception {
return SyncRetryHandler
.create(retryOnThrowable, backoffPolicy, client)
.executeBlocking(bulkRequest)
.actionGet();
}
static class AbstractRetryHandler implements ActionListener {
private final ESLogger logger;
private final Client client;
private final ActionListener listener;
private final Iterator backoff;
private final Class retryOnThrowable;
// Access only when holding a client-side lock, see also #addResponses()
private final List responses = new ArrayList<>();
private final long startTimestampNanos;
// needed to construct the next bulk request based on the response to the previous one
// volatile as we're called from a scheduled thread
private volatile BulkRequest currentBulkRequest;
private volatile ScheduledFuture scheduledRequestFuture;
public AbstractRetryHandler(Class retryOnThrowable, BackoffPolicy backoffPolicy, Client client, ActionListener listener) {
this.retryOnThrowable = retryOnThrowable;
this.backoff = backoffPolicy.iterator();
this.client = client;
this.listener = listener;
this.logger = Loggers.getLogger(getClass(), client.settings());
// in contrast to System.currentTimeMillis(), nanoTime() uses a monotonic clock under the hood
this.startTimestampNanos = System.nanoTime();
}
@Override
public void onResponse(BulkResponse bulkItemResponses) {
if (!bulkItemResponses.hasFailures()) {
// we're done here, include all responses
addResponses(bulkItemResponses, TruePredicate.INSTANCE);
finishHim();
} else {
if (canRetry(bulkItemResponses)) {
addResponses(bulkItemResponses, new BulkItemResponsePredicate() {
@Override
public boolean test(BulkItemResponse response) {
return !response.isFailed();
}
});
retry(createBulkRequestForRetry(bulkItemResponses));
} else {
addResponses(bulkItemResponses, TruePredicate.INSTANCE);
finishHim();
}
}
}
@Override
public void onFailure(Throwable e) {
try {
listener.onFailure(e);
} finally {
FutureUtils.cancel(scheduledRequestFuture);
}
}
private void retry(final BulkRequest bulkRequestForRetry) {
assert backoff.hasNext();
TimeValue next = backoff.next();
logger.trace("Retry of bulk request scheduled in {} ms.", next.millis());
scheduledRequestFuture = client.threadPool().schedule(next, ThreadPool.Names.SAME, new Runnable() {
@Override
public void run() {
AbstractRetryHandler.this.execute(bulkRequestForRetry);
}
});
}
private BulkRequest createBulkRequestForRetry(BulkResponse bulkItemResponses) {
BulkRequest requestToReissue = new BulkRequest(currentBulkRequest);
int index = 0;
for (BulkItemResponse bulkItemResponse : bulkItemResponses.getItems()) {
if (bulkItemResponse.isFailed()) {
requestToReissue.add(currentBulkRequest.requests().get(index));
}
index++;
}
return requestToReissue;
}
private boolean canRetry(BulkResponse bulkItemResponses) {
if (!backoff.hasNext()) {
return false;
}
for (BulkItemResponse bulkItemResponse : bulkItemResponses) {
if (bulkItemResponse.isFailed()) {
Throwable cause = bulkItemResponse.getFailure().getCause();
Throwable rootCause = ExceptionsHelper.unwrapCause(cause);
if (!rootCause.getClass().equals(retryOnThrowable)) {
return false;
}
}
}
return true;
}
private void finishHim() {
try {
listener.onResponse(getAccumulatedResponse());
} finally {
FutureUtils.cancel(scheduledRequestFuture);
}
}
private void addResponses(BulkResponse response, BulkItemResponsePredicate filter) {
for (BulkItemResponse bulkItemResponse : response) {
if (filter.test(bulkItemResponse)) {
// Use client-side lock here to avoid visibility issues. This method may be called multiple times
// (based on how many retries we have to issue) and relying that the response handling code will be
// scheduled on the same thread is fragile.
synchronized (responses) {
responses.add(bulkItemResponse);
}
}
}
}
private BulkResponse getAccumulatedResponse() {
BulkItemResponse[] itemResponses;
synchronized (responses) {
itemResponses = responses.toArray(new BulkItemResponse[1]);
}
long stopTimestamp = System.nanoTime();
long totalLatencyMs = TimeValue.timeValueNanos(stopTimestamp - startTimestampNanos).millis();
return new BulkResponse(itemResponses, totalLatencyMs);
}
public void execute(BulkRequest bulkRequest) {
this.currentBulkRequest = bulkRequest;
client.bulk(bulkRequest, this);
}
}
static class AsyncRetryHandler extends AbstractRetryHandler {
public AsyncRetryHandler(Class retryOnThrowable, BackoffPolicy backoffPolicy, Client client, ActionListener listener) {
super(retryOnThrowable, backoffPolicy, client, listener);
}
}
static class SyncRetryHandler extends AbstractRetryHandler {
private final PlainActionFuture actionFuture;
public static SyncRetryHandler create(Class retryOnThrowable, BackoffPolicy backoffPolicy, Client client) {
PlainActionFuture actionFuture = PlainActionFuture.newFuture();
return new SyncRetryHandler(retryOnThrowable, backoffPolicy, client, actionFuture);
}
public SyncRetryHandler(Class retryOnThrowable, BackoffPolicy backoffPolicy, Client client, PlainActionFuture actionFuture) {
super(retryOnThrowable, backoffPolicy, client, actionFuture);
this.actionFuture = actionFuture;
}
public ActionFuture executeBlocking(BulkRequest bulkRequest) {
super.execute(bulkRequest);
return actionFuture;
}
}
private interface BulkItemResponsePredicate {
boolean test(BulkItemResponse response);
}
private static class TruePredicate implements BulkItemResponsePredicate {
private static final TruePredicate INSTANCE = new TruePredicate();
@Override
public boolean test(BulkItemResponse response) {
return true;
}
}
}