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From "Liang Xie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9519) fix NPE in EncodedScannerV2.getFirstKeyInBlock()
Date Fri, 13 Sep 2013 03:18:53 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13766202#comment-13766202
] 

Liang Xie commented on HBASE-9519:
----------------------------------

bq. What encoding was used that led to NPE ?

Sorry, i don't have the original accident log right now, it was fixed in Aug. IMO, it didn't
relate with the exactly detailed encoding algo, it's just an EncodedScannerV2 issue.
                
> fix NPE in EncodedScannerV2.getFirstKeyInBlock()
> ------------------------------------------------
>
>                 Key: HBASE-9519
>                 URL: https://issues.apache.org/jira/browse/HBASE-9519
>             Project: HBase
>          Issue Type: Bug
>          Components: HFile
>    Affects Versions: 0.98.0, 0.96.1
>            Reporter: Liang Xie
>            Assignee: Liang Xie
>         Attachments: HBASE-9519.txt, HBASE-9519-v2.txt
>
>
> we observed a reproducable NPE while scanning special table under special condition in
our IntegratedTesting scenario, it was fixed by appling the attached patch.
> org.apache.hadoop.hbase.client.ScannerCallable@67ee75a5, java.io.IOException: java.io.IOException:
java.lang.NullPointerException
> at org.apache.hadoop.hbase.regionserver.HRegionServer.convertThrowableToIOE(HRegionServer.java:1186)
> at org.apache.hadoop.hbase.regionserver.HRegionServer.convertThrowableToIOE(HRegionServer.java:1175)
> at org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:2391)
> at sun.reflect.GeneratedMethodAccessor24.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$Server.call(SecureRpcEngine.java:456)
> at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1426)
> Caused by: java.lang.NullPointerException
> at org.apache.hadoop.hbase.io.hfile.HFileReaderV2$EncodedScannerV2.getFirstKeyInBlock(HFileReaderV2.java:1071)
> at org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.seekBefore(HFileReaderV2.java:547)
> at org.apache.hadoop.hbase.io.HalfStoreFileReader$1.seekBefore(HalfStoreFileReader.java:159)
> at org.apache.hadoop.hbase.io.HalfStoreFileReader$1.seekBefore(HalfStoreFileReader.java:142)
> at org.apache.hadoop.hbase.io.HalfStoreFileReader.getLastKey(HalfStoreFileReader.java:267)
> at org.apache.hadoop.hbase.regionserver.StoreFile$Reader.passesKeyRangeFilter(StoreFile.java:1543)
> at org.apache.hadoop.hbase.regionserver.StoreFileScanner.shouldUseScanner(StoreFileScanner.java:375)
> at org.apache.hadoop.hbase.regionserver.StoreScanner.selectScannersFrom(StoreScanner.java:298)
> at org.apache.hadoop.hbase.regionserver.StoreScanner.getScannersNoCompaction(StoreScanner.java:262)
> at org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:149)
> at org.apache.hadoop.hbase.regionserver.Store.getScanner(Store.java:2122)
> at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.<init>(HRegion.java:3460)
> at org.apache.hadoop.hbase.regionserver.HRegion.instantiateRegionScanner(HRegion.java:1645)
> at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1635)
> at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1610)
> at org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:2377)
> ... 5 more

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