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From "Christian Kunz (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2756) NPE in DFSClient in hbase under load
Date Tue, 04 Mar 2008 00:20:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12574799#action_12574799
] 

Christian Kunz commented on HADOOP-2756:
----------------------------------------

+1 blocker for 0.16.

Some of our tasks fail with this exception, not necessarily under load. And when trying to
run distcp on the target cluster with about 20,000 mappers there were more than 400 such failures.

> 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
>            Priority: Minor
>         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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