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Date: Tue, 4 May 2010 05:01:56 -0400 (EDT)
From: "Jeff Hammerbacher (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-6723) unchecked exceptions thrown in IPC
 Connection orphan clients
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    [ https://issues.apache.org/jira/browse/HADOOP-6723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12863725#action_12863725 ] 

Jeff Hammerbacher commented on HADOOP-6723:
-------------------------------------------

Any reason this hasn't been committed yet?

> unchecked exceptions thrown in IPC Connection orphan clients
> ------------------------------------------------------------
>
>                 Key: HADOOP-6723
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6723
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ipc
>    Affects Versions: 0.20.2
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>             Fix For: 0.21.0, 0.22.0
>
>         Attachments: hadoop-6723.txt
>
>
> If the server sends back some malformed data, for example,  receiveResponse() can end up with an incorrect call ID. Then, when it tries to find it in the calls map, it will end up with null and throw NPE in receiveResponse. This isn't caught anywhere, so the original IPC client ends up hanging forever instead of catching an exception. Another example is if the writable implementation itself throws an unchecked exception or OOME.
> We should catch Throwable in Connection.run() and shut down the connection if we catch one.

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