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https://issues.apache.org/jira/browse/HADOOP-1949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12530803
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Raghu Angadi commented on HADOOP-1949:
--------------------------------------
This happened when Namenode was under heavy load and timing out connections. So
clients would be closing the connections.
> NPE in IPC handler.
> -------------------
>
> Key: HADOOP-1949
> URL: https://issues.apache.org/jira/browse/HADOOP-1949
> Project: Hadoop
> Issue Type: Bug
> Components: ipc
> Affects Versions: 0.14.1
> Reporter: Raghu Angadi
>
> Noticed a few of the following traces during upgrade of a large cluster to
> 0.14.1 :
> {noformat}
> 2007-09-26 17:21:40,134 WARN org.apache.hadoop.ipc.Server: IPC Server handler
> 20 on 8020, call
> processUpgradeCommand([EMAIL PROTECTED])
> from 192.0.0.100:40500: output error
> java.lang.NullPointerException
> at
> org.apache.hadoop.ipc.SocketChannelOutputStream.flushBuffer(SocketChannelOutputStream.java:108)
> at
> org.apache.hadoop.ipc.SocketChannelOutputStream.write(SocketChannelOutputStream.java:89)
> at
> java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
> at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
> at java.io.DataOutputStream.flush(DataOutputStream.java:106)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:585)
> {noformat}
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