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https://issues.apache.org/jira/browse/HBASE-19681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16307522#comment-16307522
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Anirban Roy commented on HBASE-19681:
-------------------------------------
We also want to know if there is any potential data loss due to this error.
Looking at the region server log, we see a reference to the hfile, a few other
hfiles compacted to this file but no reference that this particular hfile being
compacted to newer hfile. But when we check HDFS, the file is really missing.
Once the region server get restarted, it no more complains about the missing
hfile. Hence, this is very important to know the behavior and any impact due
that, before we get a fix here.
> Online snapshot creation failing with missing store file
> --------------------------------------------------------
>
> Key: HBASE-19681
> URL: https://issues.apache.org/jira/browse/HBASE-19681
> Project: HBase
> Issue Type: Bug
> Components: backup&restore, snapshots
> Affects Versions: 1.3.0
> Environment: Hadoop - 2.7.3
> HBase 1.3.0
> OS - GNU/Linux x86_64
> Cluster - Amazon Elastic Mapreduce
> Reporter: Anirban Roy
>
> We are facing problem creating online snapshot of our HBase table. The table
> contains 20TB data and receiving ~10000 writes per second. The snapshot
> creating failing intermittently with error that some hfile missing, see the
> detailed output below. Once we locate the region server hosting the region
> and restart the region server, snapshot creation succeeds. It seems the
> missing hfile removed due to minor compaction, but region server still holds
> the pointer to the file.
> [hadoop@ip-10-0-12-164 ~]$ hbase shell
> HBase Shell; enter 'help<RETURN>' for list of supported commands.
> Type "exit<RETURN>" to leave the HBase Shell
> Version 1.3.0, rUnknown, Fri Feb 17 18:15:07 UTC 2017
>
> hbase(main):001:0> snapshot ‘x_table’, ‘x_snapshot’
>
> ERROR: org.apache.hadoop.hbase.snapshot.HBaseSnapshotException: Snapshot {
> ss=x_snapshot table=x_table type=FLUSH } had an error. Procedure x_snapshot
> { waiting=[] done=[ip-10-0-9-31.ec2.internal,16020,1508372578254,
> ip-10-0-0-32.ec2.internal,16020,1508372591059,
> ip-10-0-14-221.ec2.internal,16020,1508372580873,
> ip-10-0-15-185.ec2.internal,16020,1508372588507,
> ip-10-0-9-43.ec2.internal,16020,1508372569107,
> ip-10-0-10-62.ec2.internal,16020,1512885921693,
> ip-10-0-8-216.ec2.internal,16020,1508372584133,
> ip-10-0-1-207.ec2.internal,16020,1508372580144,
> ip-10-0-0-173.ec2.internal,16020,1508372584969,
> ip-10-0-4-79.ec2.internal,16020,1508372587161,
> ip-10-0-3-165.ec2.internal,16020,1508372593566,
> ip-10-0-14-137.ec2.internal,16020,1508372583225,
> ip-10-0-6-33.ec2.internal,16020,1508372581587,
> ip-10-0-15-199.ec2.internal,16020,1508372587478,
> ip-10-0-5-253.ec2.internal,16020,1508372581243,
> ip-10-0-1-99.ec2.internal,16020,1508372609684] }
> at
> org.apache.hadoop.hbase.master.snapshot.SnapshotManager.isSnapshotDone(SnapshotManager.java:354)
> at
> org.apache.hadoop.hbase.master.MasterRpcServices.isSnapshotDone(MasterRpcServices.java:1058)
> at
> org.apache.hadoop.hbase.protobuf.generated.MasterProtos$MasterService$2.callBlockingMethod(MasterProtos.java:61089)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2328)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:123)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:188)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:168)
> Caused by:
> org.apache.hadoop.hbase.errorhandling.ForeignException$ProxyThrowable via
> ip-10-0-3-13.ec2.internal,16020,1508372563772:org.apache.hadoop.hbase.errorhandling.ForeignException$ProxyThrowable:
> java.io.FileNotFoundException: File does not exist:
> hdfs://ip-10-0-12-164.ec2.internal:8020/user/hbase/data/default/x_table/ecbb3aeaf7c5b1f65742deab5812362c/d/f76d8827c29244b99bf9344982956523
> at
> org.apache.hadoop.hbase.errorhandling.ForeignExceptionDispatcher.rethrowException(ForeignExceptionDispatcher.java:83)
> at
> org.apache.hadoop.hbase.master.snapshot.TakeSnapshotHandler.rethrowExceptionIfFailed(TakeSnapshotHandler.java:315)
> at
> org.apache.hadoop.hbase.master.snapshot.SnapshotManager.isSnapshotDone(SnapshotManager.java:344)
> ... 6 more
> Caused by:
> org.apache.hadoop.hbase.errorhandling.ForeignException$ProxyThrowable:
> java.io.FileNotFoundException: File does not exist:
> hdfs://ip-10-0-12-164.ec2.internal:8020/user/hbase/data/default/x_table/ecbb3aeaf7c5b1f65742deab5812362c/d/f76d8827c29244b99bf9344982956523
> at
> org.apache.hadoop.hbase.regionserver.snapshot.RegionServerSnapshotManager$SnapshotSubprocedurePool.waitForOutstandingTasks(RegionServerSnapshotManager.java:347)
> at
> org.apache.hadoop.hbase.regionserver.snapshot.FlushSnapshotSubprocedure.flushSnapshot(FlushSnapshotSubprocedure.java:140)
> at
> org.apache.hadoop.hbase.regionserver.snapshot.FlushSnapshotSubprocedure.insideBarrier(FlushSnapshotSubprocedure.java:160)
> at
> org.apache.hadoop.hbase.procedure.Subprocedure.call(Subprocedure.java:187)
> at
> org.apache.hadoop.hbase.procedure.Subprocedure.call(Subprocedure.java:53)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
>
> Here is some help for this command:
> Take a snapshot of specified table. Examples:
>
> hbase> snapshot 'sourceTable', 'snapshotName'
> hbase> snapshot 'namespace:sourceTable', 'snapshotName', {SKIP_FLUSH =>
> true}
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