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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-14034) Allow ipc layer exceptions to selectively close connections
Date Thu, 09 Feb 2017 17:06:42 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-14034?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kihwal Lee updated HADOOP-14034:
--------------------------------
       Resolution: Fixed
     Hadoop Flags: Reviewed
    Fix Version/s: 3.0.0-alpha3
                   2.8.1
           Status: Resolved  (was: Patch Available)

I've committed this to trunk, branch-2 and branch-2.8. Thanks for working on this, Daryn.

> 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
>             Fix For: 2.8.1, 3.0.0-alpha3
>
>         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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