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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14034) Allow ipc layer exceptions to selectively close connections
Date Thu, 09 Feb 2017 16:50:41 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15859780#comment-15859780
] 

Kihwal Lee commented on HADOOP-14034:
-------------------------------------

+1. the patch looks good. We've been running with this change for several months. 

> Allow ipc layer exceptions to selectively close connections
> -----------------------------------------------------------
>
>                 Key: HADOOP-14034
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14034
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ipc
>    Affects Versions: 2.7.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HADOOP-14034-branch-2.patch, HADOOP-14034-trunk.patch
>
>
> IPC layer exceptions generated in the readers are translated into fatal errors - resulting
in connection closure.  Ex. RetriableExceptions from call queue pushback.
> Always closing the connection degrades performance for all clients since a disconnected
client will immediately reconnect on retry.  Readers become overwhelmed servicing new connections
and re-authentications from bad clients instead of servicing calls from good clients.  The
call queues run dry.
> Exceptions originating in the readers should be able to indicate if the exception is
an error or fatal so connections can remain open.



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