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https://issues.apache.org/jira/browse/HADOOP-898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12465602
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Konstantin Shvachko commented on HADOOP-898:
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You add block to containingNodes inside addStoredBlock(), but add this same
block to the
DatanodeDescriptor.blocks outside of addStoredBlock().
If something goes wrong in addStoredBlock() and it throws an exception AFTER
the block
was added to containingNodes, will that be the case we are seeing now?
We should think how to add blocks to the DatanodeDescriptor inside
addStoredBlock().
> 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.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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