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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16270) Handle duplicate clearing of snapshot in region replicas
Date Wed, 24 Aug 2016 16:08:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15435182#comment-15435182
] 

Hudson commented on HBASE-16270:
--------------------------------

FAILURE: Integrated in Jenkins build HBase-1.4 #365 (See [https://builds.apache.org/job/HBase-1.4/365/])
HBASE-16270 Handle duplicate clearing of snapshot in region replicas (enis: rev f0385b4b83bd9725aefcc9c9ec3f08cb57b33afa)
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/DefaultMemStore.java


> Handle duplicate clearing of snapshot in region replicas
> --------------------------------------------------------
>
>                 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
>             Fix For: 2.0.0, 1.3.0, 1.4.0, 1.1.6, 1.2.3
>
>         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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