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https://issues.apache.org/jira/browse/HADOOP-2756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12568808#action_12568808
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dhruba borthakur commented on HADOOP-2756:
------------------------------------------
The code looks correct but there could be an issue that needs more testing. The
streamer thread might not exit (hence the streamer.join() might block
indefinitely) if the reponseder thread is not closed (via response.close()).
> NPE in DFSClient in hbase under load
> ------------------------------------
>
> Key: HADOOP-2756
> URL: https://issues.apache.org/jira/browse/HADOOP-2756
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.16.0
> Reporter: stack
> Assignee: Raghu Angadi
> Priority: Minor
> Fix For: 0.16.1
>
> Attachments: HADOOP-2756.patch
>
>
> Saw this in logs:
> {code}
> 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)
> {code}
> 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).
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