[HADOOP-2756] NPE in DFSClient in hbase under load

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.16.0
• Fix Version/s: 0.16.1
• Assignee: Raghu Angadi
• Reporter: Michael Stack
• Created: 31/Jan/08 19:04
• Updated: 08/Jul/09 16:42
• Resolved: 05/Mar/08 22:03

Description

Saw this in logs:

2008-01-31 18:55:02,128 ERROR org.apache.hadoop.hbase.HRegionServer: Compaction failed for region TestTable,0009438931,1201805282651
java.lang.NullPointerException
        at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.close(DFSClient.java:2262)
        at org.apache.hadoop.fs.FSDataOutputStream$PositionCache.close(FSDataOutputStream.java:51)
        at org.apache.hadoop.fs.FSDataOutputStream.close(FSDataOutputStream.java:67)
        at org.apache.hadoop.hbase.HStoreFile.writeInfo(HStoreFile.java:365)
        at org.apache.hadoop.hbase.HStore.compact(HStore.java:1236) 
        at org.apache.hadoop.hbase.HRegion.compactStores(HRegion.java:775)
        at org.apache.hadoop.hbase.HRegion.compactIfNeeded(HRegion.java:707)
        at org.apache.hadoop.hbase.HRegionServer$CompactSplitThread.run(HRegionServer.java:253)

Look to see if the response data method needs to be made volatile (There's a test for null just before we use it on line #2262).

Issue Links

• is duplicated by: HADOOP-2935 unit tests failing with nullpointer exception.