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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16270) When using region replicas, get thousands of occurrences of UnexpectedStateException: Current snapshot id is -1
Date Wed, 24 Aug 2016 10:24:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15434661#comment-15434661

Enis Soztutar commented on HBASE-16270:

I've been trying to track down all the code paths that may lead to the case that we end up
with a prepared snapshot context in {{StoreFlusherImpl}}, but without the corresponding snapshot.
Unfortunately, by manual inspection I am not able to narrow the root cause. I've also checked
the integration test for this which is running with 3 column families, and tried to reproduce
it that way without success. 

Let us see whether the tests will run with this patch. We can commit the fix with some more
logging and see whether that would help or not. 

> When using region replicas, get thousands of occurrences of UnexpectedStateException:
Current snapshot id is -1
> ---------------------------------------------------------------------------------------------------------------
>                 Key: HBASE-16270
>                 URL: https://issues.apache.org/jira/browse/HBASE-16270
>             Project: HBase
>          Issue Type: Bug
>          Components: Replication
>    Affects Versions: 1.1.2
>            Reporter: Robert Yokota
>         Attachments: HBASE-16270-branch-1.2.patch, HBASE-16270-master.patch
> We have an HBase (1.1.2) production cluster with 58 region servers and a staging cluster
with 6 region servers.
> For both clusters, we enabled region replicas with the following settings:
> hbase.regionserver.storefile.refresh.period = 0
> hbase.region.replica.replication.enabled = true
> hbase.region.replica.replication.memstore.enabled = true
> hbase.master.hfilecleaner.ttl = 3600000
> hbase.master.loadbalancer.class = org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer
> hbase.meta.replica.count = 3
> hbase.regionserver.meta.storefile.refresh.period = 30000
> hbase.region.replica.wait.for.primary.flush = true
> hbase.region.replica.storefile.refresh.memstore.multiplier = 4
> We then altered our HBase tables to have REGION_REPLICATION => 2
> Both clusters got into a state where a few region servers were spewing the following
error below in the HBase logs.  In one instance the error occurred over 70K times.  At this
time, these region servers would see 10x write traffic (the hadoop.HBase.RegionServer.Server.writeRequestCount
metric) and in some instances would crash.
> At the same time, we would see secondary regions move and then go into the "reads are
disabled" state for extended periods.  
> It appears there is a race condition where the DefaultMemStore::clearSnapshot method
might be called more than once in succession. The first call would set snapshotId to -1, but
the second call would throw an exception.  It seems the second call should just return if
the snapshotId is already -1, rather than throwing an exception.
> Thu Jul 21 08:38:50 UTC 2016, RpcRetryingCaller{globalStartTime=1469090201543, pause=100,
retries=35}, org.apache.hadoop.hbase.regionserver.UnexpectedStateException: org.apache.hadoop.hbase.regionserver.UnexpectedStateException:
Current snapshot id is -1,passed 1469085004304
>         at org.apache.hadoop.hbase.regionserver.DefaultMemStore.clearSnapshot(DefaultMemStore.java:187)
>         at org.apache.hadoop.hbase.regionserver.HStore.updateStorefiles(HStore.java:1054)
>         at org.apache.hadoop.hbase.regionserver.HStore.access$500(HStore.java:128)
>         at org.apache.hadoop.hbase.regionserver.HStore$StoreFlusherImpl.replayFlush(HStore.java:2270)
>         at org.apache.hadoop.hbase.regionserver.HRegion.replayFlushInStores(HRegion.java:4487)
>         at org.apache.hadoop.hbase.regionserver.HRegion.replayWALFlushCommitMarker(HRegion.java:4388)
>         at org.apache.hadoop.hbase.regionserver.HRegion.replayWALFlushMarker(HRegion.java:4191)
>         at org.apache.hadoop.hbase.regionserver.RSRpcServices.doReplayBatchOp(RSRpcServices.java:776)
>         at org.apache.hadoop.hbase.regionserver.RSRpcServices.replay(RSRpcServices.java:1655)
>         at org.apache.hadoop.hbase.protobuf.generated.AdminProtos$AdminService$2.callBlockingMethod(AdminProtos.java:22255)
>         at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2114)
>         at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:101)
>         at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:130)
>         at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:107)
>         at java.lang.Thread.run(Thread.java:745)

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