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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16012) Major compaction can't work because left scanner read point in RegionServer
Date Tue, 21 Jun 2016 01:28:57 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15340855#comment-15340855
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Duo Zhang commented on HBASE-16012:
-----------------------------------

[~lhofhansl] The exception is thrown inside the constructor. We haven't setup a lease yet
at that time...

And yes, there are some design patterns say that you should not put much code in the constructor,
especially if it throws exceptions, instead, use an 'init' method. But this is not the target
of this issue I think.

Thanks.

> 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, 1.1.6, 1.3.1, 0.98.21, 1.2.3
>            Reporter: Guanghao Zhang
>             Fix For: 2.0.0
>
>         Attachments: HBASE-16012-v1.patch, HBASE-16012-v2.patch, HBASE-16012-v3.patch,
HBASE-16012-v4.patch, 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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