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https://issues.apache.org/jira/browse/HBASE-18221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16051504#comment-16051504
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Duo Zhang commented on HBASE-18221:
-----------------------------------
Yeah the file will not be removed on HDFS if there are still references to it,
but it will be moved from storefiles to compactedfiles, in
StoreFileManager.addCompactionResults method. But in trySwitchToStreamRead we
construct the name to file map with store.getStorefiles only. We should also
count the compactedfiles here also I mean.
> Switch from pread to stream should happen under HStore's reentrant lock
> -----------------------------------------------------------------------
>
> Key: HBASE-18221
> URL: https://issues.apache.org/jira/browse/HBASE-18221
> Project: HBase
> Issue Type: Sub-task
> Components: Scanners
> Affects Versions: 2.0.0, 3.0.0, 2.0.0-alpha-1
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Fix For: 2.0.0, 3.0.0, 2.0.0-alpha-2
>
>
> Found this while debugging HBASE-18186. When we try to reopen the scanners on
> the storefiles while trying to switch over from pread to stream, we do not
> use the HStore's reentrant lock to get the current Storefiles from the
> StoreFileManager. All the scan APIs are guarded under that and we must do it
> here also other wise the CompactedHfileDischarger may cause race issues with
> the HStore's datastructures like here
> {code}
> 2017-06-14 18:16:17,223 WARN
> [RpcServer.default.FPBQ.Fifo.handler=23,queue=1,port=16020]
> regionserver.StoreScanner: failed to switch to stream read
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.getScannersForStoreFiles(StoreFileScanner.java:133)
> at
> org.apache.hadoop.hbase.regionserver.HStore.getScanners(HStore.java:1221)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.trySwitchToStreamRead(StoreScanner.java:997)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.shipped(StoreScanner.java:1134)
> at
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.shipped(KeyValueHeap.java:445)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.shipped(HRegion.java:6459)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices$RegionScannerShippedCallBack.run(RSRpcServices.java:339)
> at
> org.apache.hadoop.hbase.ipc.ServerCall.setResponse(ServerCall.java:252)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:166)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:278)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:258)
> {code}
> I have a working patch fixing this problem. Will do some more testing and try
> to upload the patch after I write a test case for this.
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