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https://issues.apache.org/jira/browse/HBASE-16012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15328901#comment-15328901
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Anoop Sam John commented on HBASE-16012:
----------------------------------------
There was one more scenario discussed in the mail chain. That was like
explicit close of the scanner is not happening from client side and so Lease
time out happens. Then the close() op on RegionScanner may throw some
Exception and so the removal of the readPnt from the Map not happening. It
would be good to do a try finally there also.
> Major compaction can't work because left scanner read point in RegionServer
> ---------------------------------------------------------------------------
>
> Key: HBASE-16012
> URL: https://issues.apache.org/jira/browse/HBASE-16012
> Project: HBase
> Issue Type: Bug
> Components: Compaction, Scanners
> Affects Versions: 2.0.0, 0.94.27
> Reporter: Guanghao Zhang
> Attachments: HBASE-16012.patch
>
>
> When new RegionScanner, it will add a scanner read point in
> scannerReadPoints. But if we got a exception after add read point, the read
> point will keep in regions server and the delete after this mvcc number will
> never be compacted.
> Our hbase version is base 0.94. If it throws other exception when initialize
> RegionScanner, the master branch has this bug, too.
> ERROR org.apache.hadoop.hbase.regionserver.HRegionServer: Failed openScanner
> java.io.IOException: Could not seek StoreFileScanner
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.seek(StoreFileScanner.java:160)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.seekScanners(StoreScanner.java:268)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:168)
> at org.apache.hadoop.hbase.regionserver.Store.getScanner(Store.java:2232)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.<init>(HRegion.java:4026)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.instantiateRegionScanner(HRegion.java:1895)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1879)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1854)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.internalOpenScanner(HRegionServer.java:3032)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:2995)
> at sun.reflect.GeneratedMethodAccessor67.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.apache.hadoop.hbase.ipc.SecureRpcEngine$Server.call(SecureRpcEngine.java:338)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1595)
> Caused by: org.apache.hadoop.hbase.ipc.CallerDisconnectedException: Aborting
> call openScanner, since caller disconnected
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Call.throwExceptionIfCallerDisconnected(HBaseServer.java:475)
> at
> org.apache.hadoop.hbase.io.hfile.HFileBlock$AbstractFSReader.readAtOffset(HFileBlock.java:1443)
> at
> org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderV2.readBlockDataInternal(HFileBlock.java:1902)
> at
> org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderV2.readBlockData(HFileBlock.java:1766)
> at
> org.apache.hadoop.hbase.io.hfile.HFileReaderV2.readBlock(HFileReaderV2.java:345)
> at
> org.apache.hadoop.hbase.io.hfile.HFileBlockIndex$BlockIndexReader.loadDataBlockWithScanInfo(HFileBlockIndex.java:254)
> at
> org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.seekTo(HFileReaderV2.java:499)
> at
> org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.seekTo(HFileReaderV2.java:520)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.seekAtOrAfter(StoreFileScanner.java:235)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.seek(StoreFileScanner.java:148)
> ... 14 more
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