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IndicesStore checks for `allocated elsewhere` for every shard not allocated on the local node 

On each clusterstate update we check on the local node if we can delete some shards content.
For this we linearly walk all shards and check if they are allocated and started on another node
and if we can delete them locally. if we can delete them locally we go and ask other nodes if we can
delete them and then if the shared IS active elsewhere issue a state update task to delete it. Yet,
there is a bug in IndicesService#canDeleteShardContent which returns `true` even if that shards
datapath doesn't exist on the node which causes tons of unnecessary node to node communciation and
as many state update task to be issued. This can have large impact on the cluster state processing
speed.

**NOTE:** This only happens for shards that have at least one shard allocated on the node
ie. if an `IndexService` exists.

Closes #17106
This commit is contained in:
Simon Willnauer 2016-03-15 11:39:45 +01:00
parent e85d8b3817
commit 10333e2f05
2 changed files with 11 additions and 4 deletions
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13
core/src/main/java/org/elasticsearch/indices/IndicesService.java
View File

@ -624,12 +624,17 @@ public class IndicesService extends AbstractLifecycleComponent<IndicesService> i
assert shardId.getIndex().equals(indexSettings.getIndex());
final IndexService indexService = indexService(shardId.getIndex());
if (indexSettings.isOnSharedFilesystem() == false) {
if (indexService != null && nodeEnv.hasNodeFile()) {
return indexService.hasShard(shardId.id()) == false;
} else if (nodeEnv.hasNodeFile()) {
if (indexSettings.hasCustomDataPath()) {
if (nodeEnv.hasNodeFile()) {
final boolean isAllocated = indexService != null && indexService.hasShard(shardId.id());
if (isAllocated) {
return false; // we are allocated - can't delete the shard
} else if (indexSettings.hasCustomDataPath()) {
// lets see if it's on a custom path (return false if the shared doesn't exist)
// we don't need to delete anything that is not there
return Files.exists(nodeEnv.resolveCustomLocation(indexSettings, shardId));
} else {
// lets see if it's path is available (return false if the shared doesn't exist)
// we don't need to delete anything that is not there
return FileSystemUtils.exists(nodeEnv.availableShardPaths(shardId));
}
}

2
core/src/test/java/org/elasticsearch/indices/IndicesServiceTests.java
View File

@ -81,6 +81,8 @@ public class IndicesServiceTests extends ESSingleNodeTestCase {
assertFalse("shard is allocated", indicesService.canDeleteShardContent(shardId, test.getIndexSettings()));
test.removeShard(0, "boom");
assertTrue("shard is removed", indicesService.canDeleteShardContent(shardId, test.getIndexSettings()));
ShardId notAllocated = new ShardId(test.index(), 100);
assertFalse("shard that was never on this node should NOT be deletable", indicesService.canDeleteShardContent(notAllocated, test.getIndexSettings()));
}
public void testDeleteIndexStore() throws Exception {