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https://issues.apache.org/jira/browse/HADOOP-9844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15089533#comment-15089533
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Steve Loughran commented on HADOOP-9844:
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Reviewing the stack traces and causes, {{setupResponse()}} assumes that on an
RPC failure it has a non-null message. {{ doSaslReply(Message message)}}
doesn't always do this .. it should set things up. There's also another place
calling IOE.getMessage() for the message, something that should fall back to
IOE.toString().
I'll do that and add a final sanity check in {{setupResponse()}} which sets the
error to "error" if nothing else.
> NPE when trying to create an error message response of RPC
> ----------------------------------------------------------
>
> Key: HADOOP-9844
> URL: https://issues.apache.org/jira/browse/HADOOP-9844
> Project: Hadoop Common
> Issue Type: Bug
> Components: ipc
> Affects Versions: 2.7.1, 3.0.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Labels: BB2015-05-TBR
> Attachments: HADOOP-9844-001.patch
>
>
> I'm seeing an NPE which is raised when the server is trying to create an
> error response to send back to the caller and there is no error text.
> The root cause is probably somewhere in SASL, but sending something back to
> the caller would seem preferable to NPE-ing server-side.
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