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Snapshot/Restore: Batching of snapshot state updates 

Similar to the batching of "shards-started" actions, this commit implements batching of snapshot status updates. This is useful when backing up many indices as the cluster state does not need to be republished as many times.

Closes #10295
This commit is contained in:
Yannick Welsch 2015-03-26 15:14:32 +01:00 committed by Igor Motov
parent 0a6f7ef379
commit 14c1743f30
3 changed files with 389 additions and 74 deletions
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112
src/main/java/org/elasticsearch/snapshots/RestoreService.java
View File

@ -25,6 +25,7 @@ import com.carrotsearch.hppc.cursors.ObjectObjectCursor;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import org.elasticsearch.Version;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.support.IndicesOptions;
@ -39,6 +40,7 @@ import org.elasticsearch.cluster.settings.ClusterDynamicSettings;
import org.elasticsearch.cluster.settings.DynamicSettings;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.collect.Tuple;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.io.stream.StreamInput;
@ -47,6 +49,7 @@ import org.elasticsearch.common.regex.Regex;
import org.elasticsearch.common.settings.ImmutableSettings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.util.concurrent.ConcurrentCollections;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.repositories.RepositoriesService;
import org.elasticsearch.repositories.Repository;
@ -55,6 +58,8 @@ import org.elasticsearch.transport.*;
import java.io.IOException;
import java.util.*;
import java.util.Map.Entry;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CopyOnWriteArrayList;
import static com.google.common.collect.Lists.newArrayList;
@ -120,6 +125,8 @@ public class RestoreService extends AbstractComponent implements ClusterStateLis
private final CopyOnWriteArrayList<ActionListener<RestoreCompletionResponse>> listeners = new CopyOnWriteArrayList<>();
private final BlockingQueue<UpdateIndexShardRestoreStatusRequest> updatedSnapshotStateQueue = ConcurrentCollections.newBlockingQueue();
@Inject
public RestoreService(Settings settings, ClusterService clusterService, RepositoriesService repositoriesService, TransportService transportService,
AllocationService allocationService, MetaDataCreateIndexService createIndexService, @ClusterDynamicSettings DynamicSettings dynamicSettings,
@ -469,42 +476,75 @@ public class RestoreService extends AbstractComponent implements ClusterStateLis
* @param request update shard status request
*/
private void updateRestoreStateOnMaster(final UpdateIndexShardRestoreStatusRequest request) {
clusterService.submitStateUpdateTask("update snapshot state", new ProcessedClusterStateUpdateTask() {
logger.trace("received updated snapshot restore state [{}]", request);
updatedSnapshotStateQueue.add(request);
private RestoreInfo restoreInfo = null;
private Map<ShardId, ShardRestoreStatus> shards = null;
clusterService.submitStateUpdateTask("update snapshot state", new ProcessedClusterStateUpdateTask() {
private final List<UpdateIndexShardRestoreStatusRequest> drainedRequests = new ArrayList<>();
private Map<SnapshotId, Tuple<RestoreInfo, Map<ShardId, ShardRestoreStatus>>> batchedRestoreInfo = null;
@Override
public ClusterState execute(ClusterState currentState) {
MetaData metaData = currentState.metaData();
MetaData.Builder mdBuilder = MetaData.builder(currentState.metaData());
RestoreMetaData restore = metaData.custom(RestoreMetaData.TYPE);
if (request.processed) {
return currentState;
}
updatedSnapshotStateQueue.drainTo(drainedRequests);
final int batchSize = drainedRequests.size();
// nothing to process (a previous event has processed it already)
if (batchSize == 0) {
return currentState;
}
final MetaData metaData = currentState.metaData();
final RestoreMetaData restore = metaData.custom(RestoreMetaData.TYPE);
if (restore != null) {
boolean changed = false;
boolean found = false;
ArrayList<RestoreMetaData.Entry> entries = newArrayList();
int changedCount = 0;
final List<RestoreMetaData.Entry> entries = newArrayList();
for (RestoreMetaData.Entry entry : restore.entries()) {
if (entry.snapshotId().equals(request.snapshotId())) {
assert !found;
found = true;
Map<ShardId, ShardRestoreStatus> shards = newHashMap(entry.shards());
logger.trace("[{}] Updating shard [{}] with status [{}]", request.snapshotId(), request.shardId(), request.status().state());
shards.put(request.shardId(), request.status());
Map<ShardId, ShardRestoreStatus> shards = null;
for (int i = 0; i < batchSize; i++) {
final UpdateIndexShardRestoreStatusRequest updateSnapshotState = drainedRequests.get(i);
updateSnapshotState.processed = true;
if (entry.snapshotId().equals(updateSnapshotState.snapshotId())) {
logger.trace("[{}] Updating shard [{}] with status [{}]", updateSnapshotState.snapshotId(), updateSnapshotState.shardId(), updateSnapshotState.status().state());
if (shards == null) {
shards = newHashMap(entry.shards());
}
shards.put(updateSnapshotState.shardId(), updateSnapshotState.status());
changedCount++;
}
}
if (shards != null) {
if (!completed(shards)) {
entries.add(new RestoreMetaData.Entry(entry.snapshotId(), RestoreMetaData.State.STARTED, entry.indices(), ImmutableMap.copyOf(shards)));
} else {
logger.info("restore [{}] is done", request.snapshotId());
restoreInfo = new RestoreInfo(entry.snapshotId().getSnapshot(), entry.indices(), shards.size(), shards.size() - failedShards(shards));
this.shards = shards;
logger.info("restore [{}] is done", entry.snapshotId());
if (batchedRestoreInfo == null) {
batchedRestoreInfo = newHashMap();
}
assert !batchedRestoreInfo.containsKey(entry.snapshotId());
batchedRestoreInfo.put(entry.snapshotId(),
new Tuple<>(
new RestoreInfo(entry.snapshotId().getSnapshot(), entry.indices(), shards.size(), shards.size() - failedShards(shards)),
shards));
}
changed = true;
} else {
entries.add(entry);
}
}
if (changed) {
restore = new RestoreMetaData(entries.toArray(new RestoreMetaData.Entry[entries.size()]));
mdBuilder.putCustom(RestoreMetaData.TYPE, restore);
if (changedCount > 0) {
logger.trace("changed cluster state triggered by {} snapshot restore state updates", changedCount);
final RestoreMetaData updatedRestore = new RestoreMetaData(entries.toArray(new RestoreMetaData.Entry[entries.size()]));
final MetaData.Builder mdBuilder = MetaData.builder(currentState.metaData()).putCustom(RestoreMetaData.TYPE, updatedRestore);
return ClusterState.builder(currentState).metaData(mdBuilder).build();
}
}
@ -513,12 +553,18 @@ public class RestoreService extends AbstractComponent implements ClusterStateLis
@Override
public void onFailure(String source, @Nullable Throwable t) {
for (UpdateIndexShardRestoreStatusRequest request : drainedRequests) {
logger.warn("[{}][{}] failed to update snapshot status to [{}]", t, request.snapshotId(), request.shardId(), request.status());
}
}
@Override
public void clusterStateProcessed(String source, ClusterState oldState, ClusterState newState) {
if (restoreInfo != null) {
if (batchedRestoreInfo != null) {
for (final Entry<SnapshotId, Tuple<RestoreInfo, Map<ShardId, ShardRestoreStatus>>> entry : batchedRestoreInfo.entrySet()) {
final SnapshotId snapshotId = entry.getKey();
final RestoreInfo restoreInfo = entry.getValue().v1();
final Map<ShardId, ShardRestoreStatus> shards = entry.getValue().v2();
RoutingTable routingTable = newState.getRoutingTable();
final List<ShardId> waitForStarted = newArrayList();
for (Map.Entry<ShardId, ShardRestoreStatus> shard : shards.entrySet()) {
@ -526,13 +572,13 @@ public class RestoreService extends AbstractComponent implements ClusterStateLis
ShardId shardId = shard.getKey();
ShardRouting shardRouting = findPrimaryShard(routingTable, shardId);
if (shardRouting != null && !shardRouting.active()) {
logger.trace("[{}][{}] waiting for the shard to start", request.snapshotId(), shardId);
logger.trace("[{}][{}] waiting for the shard to start", snapshotId, shardId);
waitForStarted.add(shardId);
}
}
}
if (waitForStarted.isEmpty()) {
notifyListeners();
notifyListeners(snapshotId, restoreInfo);
} else {
clusterService.addLast(new ClusterStateListener() {
@Override
@ -545,12 +591,12 @@ public class RestoreService extends AbstractComponent implements ClusterStateLis
// Shard disappeared (index deleted) or became active
if (shardRouting == null || shardRouting.active()) {
iterator.remove();
logger.trace("[{}][{}] shard disappeared or started - removing", request.snapshotId(), shardId);
logger.trace("[{}][{}] shard disappeared or started - removing", snapshotId, shardId);
}
}
}
if (waitForStarted.isEmpty()) {
notifyListeners();
notifyListeners(snapshotId, restoreInfo);
clusterService.remove(this);
}
}
@ -558,6 +604,7 @@ public class RestoreService extends AbstractComponent implements ClusterStateLis
}
}
}
}
private ShardRouting findPrimaryShard(RoutingTable routingTable, ShardId shardId) {
IndexRoutingTable indexRoutingTable = routingTable.index(shardId.getIndex());
@ -570,10 +617,10 @@ public class RestoreService extends AbstractComponent implements ClusterStateLis
return null;
}
private void notifyListeners() {
private void notifyListeners(SnapshotId snapshotId, RestoreInfo restoreInfo) {
for (ActionListener<RestoreCompletionResponse> listener : listeners) {
try {
listener.onResponse(new RestoreCompletionResponse(request.snapshotId, restoreInfo));
listener.onResponse(new RestoreCompletionResponse(snapshotId, restoreInfo));
} catch (Throwable e) {
logger.warn("failed to update snapshot status for [{}]", e, listener);
}
@ -952,6 +999,8 @@ public class RestoreService extends AbstractComponent implements ClusterStateLis
private ShardId shardId;
private ShardRestoreStatus status;
volatile boolean processed; // state field, no need to serialize
private UpdateIndexShardRestoreStatusRequest() {
}
@ -989,6 +1038,11 @@ public class RestoreService extends AbstractComponent implements ClusterStateLis
public ShardRestoreStatus status() {
return status;
}
@Override
public String toString() {
return "" + snapshotId + ", shardId [" + shardId + "], status [" + status.state() + "]";
}
}
/**

72
src/main/java/org/elasticsearch/snapshots/SnapshotsService.java
View File

@ -21,6 +21,7 @@ package org.elasticsearch.snapshots;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import org.apache.lucene.util.CollectionUtil;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.ExceptionsHelper;
@ -44,6 +45,7 @@ import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.util.concurrent.ConcurrentCollections;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.index.snapshots.IndexShardRepository;
import org.elasticsearch.index.snapshots.IndexShardSnapshotAndRestoreService;
@ -58,6 +60,7 @@ import org.elasticsearch.transport.*;
import java.io.IOException;
import java.util.*;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
@ -107,6 +110,7 @@ public class SnapshotsService extends AbstractLifecycleComponent<SnapshotsServic
private final CopyOnWriteArrayList<SnapshotCompletionListener> snapshotCompletionListeners = new CopyOnWriteArrayList<>();
private final BlockingQueue<UpdateIndexShardSnapshotStatusRequest> updatedSnapshotStateQueue = ConcurrentCollections.newBlockingQueue();
@Inject
public SnapshotsService(Settings settings, ClusterService clusterService, RepositoriesService repositoriesService, ThreadPool threadPool,
@ -935,20 +939,51 @@ public class SnapshotsService extends AbstractLifecycleComponent<SnapshotsServic
* @param request update shard status request
*/
private void innerUpdateSnapshotState(final UpdateIndexShardSnapshotStatusRequest request) {
logger.trace("received updated snapshot restore state [{}]", request);
updatedSnapshotStateQueue.add(request);
clusterService.submitStateUpdateTask("update snapshot state", new ClusterStateUpdateTask() {
private final List<UpdateIndexShardSnapshotStatusRequest> drainedRequests = new ArrayList<>();
@Override
public ClusterState execute(ClusterState currentState) {
MetaData metaData = currentState.metaData();
MetaData.Builder mdBuilder = MetaData.builder(currentState.metaData());
SnapshotMetaData snapshots = metaData.custom(SnapshotMetaData.TYPE);
if (request.processed) {
return currentState;
}
updatedSnapshotStateQueue.drainTo(drainedRequests);
final int batchSize = drainedRequests.size();
// nothing to process (a previous event has processed it already)
if (batchSize == 0) {
return currentState;
}
final MetaData metaData = currentState.metaData();
final SnapshotMetaData snapshots = metaData.custom(SnapshotMetaData.TYPE);
if (snapshots != null) {
boolean changed = false;
ArrayList<SnapshotMetaData.Entry> entries = newArrayList();
int changedCount = 0;
final List<SnapshotMetaData.Entry> entries = newArrayList();
for (SnapshotMetaData.Entry entry : snapshots.entries()) {
if (entry.snapshotId().equals(request.snapshotId())) {
HashMap<ShardId, ShardSnapshotStatus> shards = newHashMap(entry.shards());
logger.trace("[{}] Updating shard [{}] with status [{}]", request.snapshotId(), request.shardId(), request.status().state());
shards.put(request.shardId(), request.status());
HashMap<ShardId, ShardSnapshotStatus> shards = null;
for (int i = 0; i < batchSize; i++) {
final UpdateIndexShardSnapshotStatusRequest updateSnapshotState = drainedRequests.get(i);
updateSnapshotState.processed = true;
if (entry.snapshotId().equals(updateSnapshotState.snapshotId())) {
logger.trace("[{}] Updating shard [{}] with status [{}]", updateSnapshotState.snapshotId(), updateSnapshotState.shardId(), updateSnapshotState.status().state());
if (shards == null) {
shards = newHashMap(entry.shards());
}
shards.put(updateSnapshotState.shardId(), updateSnapshotState.status());
changedCount++;
}
}
if (shards != null) {
if (!completed(shards.values())) {
entries.add(new SnapshotMetaData.Entry(entry, ImmutableMap.copyOf(shards)));
} else {
@ -960,14 +995,15 @@ public class SnapshotsService extends AbstractLifecycleComponent<SnapshotsServic
endSnapshot(updatedEntry);
logger.info("snapshot [{}] is done", updatedEntry.snapshotId());
}
changed = true;
} else {
entries.add(entry);
}
}
if (changed) {
snapshots = new SnapshotMetaData(entries.toArray(new SnapshotMetaData.Entry[entries.size()]));
mdBuilder.putCustom(SnapshotMetaData.TYPE, snapshots);
if (changedCount > 0) {
logger.trace("changed cluster state triggered by {} snapshot state updates", changedCount);
final SnapshotMetaData updatedSnapshots = new SnapshotMetaData(entries.toArray(new SnapshotMetaData.Entry[entries.size()]));
final MetaData.Builder mdBuilder = MetaData.builder(currentState.metaData()).putCustom(SnapshotMetaData.TYPE, updatedSnapshots);
return ClusterState.builder(currentState).metaData(mdBuilder).build();
}
}
@ -976,8 +1012,10 @@ public class SnapshotsService extends AbstractLifecycleComponent<SnapshotsServic
@Override
public void onFailure(String source, Throwable t) {
for (UpdateIndexShardSnapshotStatusRequest request : drainedRequests) {
logger.warn("[{}][{}] failed to update snapshot status to [{}]", t, request.snapshotId(), request.shardId(), request.status());
}
}
});
}
@ -1562,6 +1600,8 @@ public class SnapshotsService extends AbstractLifecycleComponent<SnapshotsServic
private ShardId shardId;
private SnapshotMetaData.ShardSnapshotStatus status;
volatile boolean processed; // state field, no need to serialize
private UpdateIndexShardSnapshotStatusRequest() {
}
@ -1599,6 +1639,12 @@ public class SnapshotsService extends AbstractLifecycleComponent<SnapshotsServic
public SnapshotMetaData.ShardSnapshotStatus status() {
return status;
}
@Override
public String toString()
{
return "" + snapshotId + ", shardId [" + shardId + "], status [" + status.state() + "]";
}
}
/**

221
src/test/java/org/elasticsearch/snapshots/SharedClusterSnapshotRestoreTests.java
View File

@ -33,20 +33,21 @@ import org.elasticsearch.action.admin.cluster.snapshots.get.GetSnapshotsResponse
import org.elasticsearch.action.admin.cluster.snapshots.restore.RestoreSnapshotResponse;
import org.elasticsearch.action.admin.cluster.snapshots.status.*;
import org.elasticsearch.action.admin.cluster.state.ClusterStateResponse;
import org.elasticsearch.action.admin.cluster.tasks.PendingClusterTasksResponse;
import org.elasticsearch.action.admin.indices.flush.FlushResponse;
import org.elasticsearch.action.admin.indices.settings.get.GetSettingsResponse;
import org.elasticsearch.action.admin.indices.template.get.GetIndexTemplatesResponse;
import org.elasticsearch.action.count.CountResponse;
import org.elasticsearch.action.index.IndexRequestBuilder;
import org.elasticsearch.client.Client;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.ProcessedClusterStateUpdateTask;
import org.elasticsearch.cluster.*;
import org.elasticsearch.cluster.metadata.*;
import org.elasticsearch.cluster.metadata.SnapshotMetaData.Entry;
import org.elasticsearch.cluster.metadata.SnapshotMetaData.ShardSnapshotStatus;
import org.elasticsearch.cluster.metadata.SnapshotMetaData.State;
import org.elasticsearch.cluster.routing.allocation.decider.FilterAllocationDecider;
import org.elasticsearch.cluster.service.PendingClusterTask;
import org.elasticsearch.common.Priority;
import org.elasticsearch.common.collect.ImmutableOpenMap;
import org.elasticsearch.common.settings.ImmutableSettings;
import org.elasticsearch.common.settings.Settings;
@ -56,6 +57,7 @@ import org.elasticsearch.index.store.IndexStore;
import org.elasticsearch.indices.InvalidIndexNameException;
import org.elasticsearch.repositories.RepositoriesService;
import org.elasticsearch.snapshots.mockstore.MockRepositoryModule;
import org.elasticsearch.test.junit.annotations.TestLogging;
import org.junit.Test;
import java.nio.channels.SeekableByteChannel;
@ -72,6 +74,7 @@ import java.util.concurrent.TimeUnit;
import static com.google.common.collect.Lists.newArrayList;
import static org.elasticsearch.cluster.metadata.IndexMetaData.SETTING_NUMBER_OF_REPLICAS;
import static org.elasticsearch.cluster.metadata.IndexMetaData.SETTING_NUMBER_OF_SHARDS;
import static org.elasticsearch.common.settings.ImmutableSettings.settingsBuilder;
import static org.elasticsearch.index.query.QueryBuilders.matchQuery;
import static org.elasticsearch.index.shard.IndexShard.INDEX_REFRESH_INTERVAL;
import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.*;
@ -1820,4 +1823,216 @@ public class SharedClusterSnapshotRestoreTests extends AbstractSnapshotTests {
}
}, timeout.millis(), TimeUnit.MILLISECONDS);
}
@Test
@TestLogging("cluster:DEBUG")
public void batchingShardUpdateTaskTest() throws Exception {
final Client client = client();
logger.info("--> creating repository");
assertAcked(client.admin().cluster().preparePutRepository("test-repo")
.setType("fs").setSettings(ImmutableSettings.settingsBuilder()
.put("location", createTempDir())
.put("compress", randomBoolean())
.put("chunk_size", randomIntBetween(100, 1000))));
assertAcked(prepareCreate("test-idx", 0, settingsBuilder().put("number_of_shards", between(1, 20))
.put("number_of_replicas", 0)));
ensureGreen();
logger.info("--> indexing some data");
final int numdocs = randomIntBetween(10, 100);
IndexRequestBuilder[] builders = new IndexRequestBuilder[numdocs];
for (int i = 0; i < builders.length; i++) {
builders[i] = client().prepareIndex("test-idx", "type1", Integer.toString(i)).setSource("field1", "bar " + i);
}
indexRandom(true, builders);
flushAndRefresh();
final int numberOfShards = getNumShards("test-idx").numPrimaries;
logger.info("number of shards: {}", numberOfShards);
final ClusterService clusterService = internalCluster().clusterService(internalCluster().getMasterName());
BlockingClusterStateListener snapshotListener = new BlockingClusterStateListener(clusterService, "update_snapshot [", "update snapshot state", Priority.HIGH);
try {
clusterService.addFirst(snapshotListener);
logger.info("--> snapshot");
ListenableActionFuture<CreateSnapshotResponse> snapshotFuture = client.admin().cluster().prepareCreateSnapshot("test-repo", "test-snap").setWaitForCompletion(true).setIndices("test-idx").execute();
// Await until shard updates are in pending state.
assertTrue(waitForPendingTasks("update snapshot state", numberOfShards));
snapshotListener.unblock();
// Check that the snapshot was successful
CreateSnapshotResponse createSnapshotResponse = snapshotFuture.actionGet();
assertEquals(SnapshotState.SUCCESS, createSnapshotResponse.getSnapshotInfo().state());
assertEquals(numberOfShards, createSnapshotResponse.getSnapshotInfo().totalShards());
assertEquals(numberOfShards, createSnapshotResponse.getSnapshotInfo().successfulShards());
} finally {
clusterService.remove(snapshotListener);
}
// Check that we didn't timeout
assertFalse(snapshotListener.timedOut());
// Check that cluster state update task was called only once
assertEquals(1, snapshotListener.count());
logger.info("--> close indices");
client.admin().indices().prepareClose("test-idx").get();
BlockingClusterStateListener restoreListener = new BlockingClusterStateListener(clusterService, "restore_snapshot[", "update snapshot state", Priority.HIGH);
try {
clusterService.addFirst(restoreListener);
logger.info("--> restore snapshot");
ListenableActionFuture<RestoreSnapshotResponse> futureRestore = client.admin().cluster().prepareRestoreSnapshot("test-repo", "test-snap").setWaitForCompletion(true).execute();
// Await until shard updates are in pending state.
assertTrue(waitForPendingTasks("update snapshot state", numberOfShards));
restoreListener.unblock();
RestoreSnapshotResponse restoreSnapshotResponse = futureRestore.actionGet();
assertThat(restoreSnapshotResponse.getRestoreInfo().totalShards(), equalTo(numberOfShards));
} finally {
clusterService.remove(restoreListener);
}
// Check that we didn't timeout
assertFalse(restoreListener.timedOut());
// Check that cluster state update task was called only once
assertEquals(1, restoreListener.count());
}
private boolean waitForPendingTasks(final String taskPrefix, final int expectedCount) throws InterruptedException {
return awaitBusy(new Predicate<Object>() {
@Override
public boolean apply(Object o) {
PendingClusterTasksResponse tasks = client().admin().cluster().preparePendingClusterTasks().get();
int count = 0;
for(PendingClusterTask task : tasks) {
if (task.getSource().toString().startsWith(taskPrefix)) {
count++;
}
}
return expectedCount == count;
}
});
}
/**
* Cluster state task that blocks waits for the blockOn task to show up and then blocks execution not letting
* any cluster state update task to be performed unless they have priority higher then passThroughPriority.
*
* This class is useful to testing of cluster state update task batching for lower priority tasks.
*/
public class BlockingClusterStateListener implements ClusterStateListener {
private final Predicate<ClusterChangedEvent> blockOn;
private final Predicate<ClusterChangedEvent> countOn;
private final ClusterService clusterService;
private final CountDownLatch latch;
private final Priority passThroughPriority;
private int count;
private boolean timedOut;
private final TimeValue timeout;
private long stopWaitingAt = -1;
public BlockingClusterStateListener(ClusterService clusterService, String blockOn, String countOn, Priority passThroughPriority) {
this(clusterService, blockOn, countOn, passThroughPriority, TimeValue.timeValueSeconds(10));
}
public BlockingClusterStateListener(ClusterService clusterService, final String blockOn, final String countOn, Priority passThroughPriority, TimeValue timeout) {
this.clusterService = clusterService;
this.blockOn = new Predicate<ClusterChangedEvent>() {
@Override
public boolean apply(ClusterChangedEvent clusterChangedEvent) {
return clusterChangedEvent.source().startsWith(blockOn);
}
};
this.countOn = new Predicate<ClusterChangedEvent>() {
@Override
public boolean apply(ClusterChangedEvent clusterChangedEvent) {
return clusterChangedEvent.source().startsWith(countOn);
}
};
this.latch = new CountDownLatch(1);
this.passThroughPriority = passThroughPriority;
this.timeout = timeout;
}
public void unblock() {
latch.countDown();
}
@Override
public void clusterChanged(ClusterChangedEvent event) {
if (blockOn.apply(event)) {
logger.info("blocking cluster state tasks on [{}]", event.source());
assert stopWaitingAt < 0; // Make sure we are the first time here
stopWaitingAt = System.currentTimeMillis() + timeout.getMillis();
addBlock();
}
if (countOn.apply(event)) {
count++;
}
}
private void addBlock() {
// We should block after this task - add blocking cluster state update task
clusterService.submitStateUpdateTask("test_block", passThroughPriority, new ClusterStateUpdateTask() {
@Override
public ClusterState execute(ClusterState currentState) throws Exception {
while(System.currentTimeMillis() < stopWaitingAt) {
for (PendingClusterTask task : clusterService.pendingTasks()) {
if (task.getSource().string().equals("test_block") == false && passThroughPriority.sameOrAfter(task.getPriority())) {
// There are other higher priority tasks in the queue and let them pass through and then set the block again
logger.info("passing through cluster state task {}", task.getSource());
addBlock();
return currentState;
}
}
try {
logger.info("wating....");
if (latch.await(Math.min(100, timeout.millis()), TimeUnit.MILLISECONDS)){
// Done waiting - unblock
logger.info("unblocked");
return currentState;
}
logger.info("done wating....");
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
}
timedOut = true;
return currentState;
}
@Override
public void onFailure(String source, Throwable t) {
logger.warn("failed to execute [{}]", t, source);
}
});
}
public int count() {
return count;
}
public boolean timedOut() {
return timedOut;
}
}
}