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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8397) NPE thrown when IPC layer gets an EOF reading a response
Date Sun, 13 May 2012 00:50:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13274110#comment-13274110

Todd Lipcon commented on HADOOP-8397:

I think we just need to check for a null result, and throw EOFException in that case.
> 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
>            Reporter: Todd Lipcon
>            Priority: Critical
> 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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