[HADOOP-8397] NPE thrown when IPC layer gets an EOF reading a response

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Duplicate
• Affects Version/s: 2.0.0-alpha, 3.0.0-alpha1
• Component/s: ipc
• Assignee: Vinayakumar B
• Reporter: Todd Lipcon
• Created: 13/May/12 00:48
• Updated: 12/May/16 18:24
• Resolved: 20/Jul/12 18:32

Description

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:

        RpcResponseHeaderProto response = 
            RpcResponseHeaderProto.parseDelimitedFrom(in);
        int callId = response.getCallId();

This is because parseDelimitedFrom() returns null in the case that the next thing to be read on the stream is an EOF.

Issue Links

• is duplicated by: HADOOP-8442 NPE in reading Client.java while reading response when dest process went down.