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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8397) NPE thrown when IPC layer gets an EOF reading a response
Date Sun, 13 May 2012 00:48:49 GMT
Todd Lipcon created HADOOP-8397:
-----------------------------------

             Summary: 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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