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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8397) NPE thrown when IPC layer gets an EOF reading a response
Date Fri, 20 Jul 2012 18:33:35 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8397?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Todd Lipcon updated HADOOP-8397:

    Resolution: Duplicate
        Status: Resolved  (was: Patch Available)

Sorry, I forgot about this one and it looks like the bug got fixed as part of HDFS-3504.
> NPE thrown when IPC layer gets an EOF reading a response
> --------------------------------------------------------
>                 Key: HADOOP-8397
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8397
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ipc
>    Affects Versions: 2.0.0-alpha, 3.0.0
>            Reporter: Todd Lipcon
>            Assignee: Vinay
>            Priority: Critical
>         Attachments: HADOOP-8397.patch
> When making a call on an IPC connection where the other end has shut down, I see the
following exception:
> Caused by: java.lang.NullPointerException
>         at org.apache.hadoop.ipc.Client$Connection.receiveResponse(Client.java:852)
>         at org.apache.hadoop.ipc.Client$Connection.run(Client.java:781)
> from the lines:
> {code}
>         RpcResponseHeaderProto response = 
>             RpcResponseHeaderProto.parseDelimitedFrom(in);
>         int callId = response.getCallId();
> {code}
> This is because parseDelimitedFrom() returns null in the case that the next thing to
be read on the stream is an EOF.

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