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Do not set fatal exception when shard follow task is stopped. (#37603) 

When shard follow task is cancelled while fetching operations then
the fatal exception field should not be set.
This commit is contained in:
Martijn van Groningen 2019-01-21 07:54:51 +01:00 committed by GitHub
parent 614950ef1c
commit 88f4b0a326
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2 changed files with 40 additions and 6 deletions
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15
x-pack/plugin/ccr/src/main/java/org/elasticsearch/xpack/ccr/action/ShardFollowNodeTask.java
View File

@ -418,12 +418,15 @@ public abstract class ShardFollowNodeTask extends AllocatedPersistentTask {
private void handleFailure(Exception e, AtomicInteger retryCounter, Runnable task) {
assert e != null;
if (shouldRetry(params.getRemoteCluster(), e) && isStopped() == false) {
int currentRetry = retryCounter.incrementAndGet();
LOGGER.debug(new ParameterizedMessage("{} error during follow shard task, retrying [{}]",
params.getFollowShardId(), currentRetry), e);
long delay = computeDelay(currentRetry, params.getReadPollTimeout().getMillis());
scheduler.accept(TimeValue.timeValueMillis(delay), task);
if (shouldRetry(params.getRemoteCluster(), e)) {
if (isStopped() == false) {
// Only retry is the shard follow task is not stopped.
int currentRetry = retryCounter.incrementAndGet();
LOGGER.debug(new ParameterizedMessage("{} error during follow shard task, retrying [{}]",
params.getFollowShardId(), currentRetry), e);
long delay = computeDelay(currentRetry, params.getReadPollTimeout().getMillis());
scheduler.accept(TimeValue.timeValueMillis(delay), task);
}
} else {
fatalException = ExceptionsHelper.convertToElastic(e);
LOGGER.warn("shard follow task encounter non-retryable error", e);

31
x-pack/plugin/ccr/src/test/java/org/elasticsearch/xpack/ccr/action/ShardFollowNodeTaskTests.java
View File

@ -40,7 +40,9 @@ import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.greaterThanOrEqualTo;
import static org.hamcrest.Matchers.hasSize;
import static org.hamcrest.Matchers.instanceOf;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.lessThanOrEqualTo;
import static org.hamcrest.Matchers.nullValue;
import static org.hamcrest.Matchers.sameInstance;
public class ShardFollowNodeTaskTests extends ESTestCase {
@ -287,6 +289,35 @@ public class ShardFollowNodeTaskTests extends ESTestCase {
assertThat(status.leaderGlobalCheckpoint(), equalTo(63L));
}
public void testFatalExceptionNotSetWhenStoppingWhileFetchingOps() {
ShardFollowTaskParams params = new ShardFollowTaskParams();
params.maxReadRequestOperationCount = 64;
params.maxOutstandingReadRequests = 1;
params.maxOutstandingWriteRequests = 1;
ShardFollowNodeTask task = createShardFollowTask(params);
startTask(task, 63, -1);
readFailures.add(new ShardNotFoundException(new ShardId("leader_index", "", 0)));
mappingVersions.add(1L);
leaderGlobalCheckpoints.add(63L);
maxSeqNos.add(63L);
responseSizes.add(64);
simulateResponse.set(true);
beforeSendShardChangesRequest = status -> {
// Cancel just before attempting to fetch operations:
task.onCancelled();
};
task.coordinateReads();
assertThat(task.isStopped(), is(true));
ShardFollowNodeTaskStatus status = task.getStatus();
assertThat(status.getFatalException(), nullValue());
assertThat(status.failedReadRequests(), equalTo(1L));
assertThat(status.successfulReadRequests(), equalTo(0L));
assertThat(status.readExceptions().size(), equalTo(1));
}
public void testEmptyShardChangesResponseShouldClearFetchException() {
ShardFollowTaskParams params = new ShardFollowTaskParams();
params.maxReadRequestOperationCount = 64;