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https://issues.apache.org/jira/browse/HADOOP-898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12465661
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Nigel Daley commented on HADOOP-898:
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-1 for HADOOP-898-2.patch
+1 for HADOOP-898.patch.
Of the two patches, I find that only HADOOP-898.patch reduces the probability
of TestSmallBlock failing from around 20% to 0% after 100+ runs.
For those interested, when TestSmallBlock fails, it's because one call to
blocks[i].getNumBytes() in the FSNamesystem.getDatanodeHints() method returns 0
when it should return 1. Since it is sporadic, it seems like a
synchronization/timing issue.
> namenode generates infinite stream of null pointers
> ---------------------------------------------------
>
> Key: HADOOP-898
> URL: https://issues.apache.org/jira/browse/HADOOP-898
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Reporter: Owen O'Malley
> Assigned To: Raghu Angadi
> Attachments: HADOOP-898-2.patch, HADOOP-898.patch
>
>
> My namenode is generating a constant stream of NullPointerExceptions. The log
> looks like:
> 2007-01-17 19:51:27,461 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 3
> on 50000 call error: java.io.IOException: java.lang.NullPointerException
> java.io.IOException: java.lang.NullPointerException
> at
> org.apache.hadoop.dfs.FSNamesystem.addStoredBlock(FSNamesystem.java:1621)
> at
> org.apache.hadoop.dfs.FSNamesystem.processReport(FSNamesystem.java:1563)
> at org.apache.hadoop.dfs.NameNode.blockReport(NameNode.java:573)
> at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:589)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:337)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:538)
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