[HBASE-9519] fix NPE in EncodedScannerV2.getFirstKeyInBlock()

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.98.0, 0.96.1
• Fix Version/s: 0.98.0
• Component/s: HFile
• Hadoop Flags: Reviewed
• Assignee: Liang Xie
• Reporter: Liang Xie
• Created: 12/Sep/13 08:20
• Updated: 20/Nov/15 11:55
• Resolved: 25/Sep/13 00:08

Description

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