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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-2188) RPC should send a ping rather than use client timeouts
Date Fri, 21 Mar 2008 18:49:29 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2188?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hairong Kuang updated HADOOP-2188:
----------------------------------

    Attachment: ipc-timeout5.patch

Fixed javadoc and findbugs warnings.

> RPC should send a ping rather than use client timeouts
> ------------------------------------------------------
>
>                 Key: HADOOP-2188
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2188
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs, ipc
>    Affects Versions: 0.16.1
>            Reporter: Owen O'Malley
>            Assignee: Hairong Kuang
>             Fix For: 0.17.0
>
>         Attachments: ipc-timeout.patch, ipc-timeout1.patch, ipc-timeout2.patch, ipc-timeout3.patch,
ipc-timeout4.patch, ipc-timeout5.patch, rpc-to.patch
>
>
> Current RPC (really IPC) relies on client side timeouts to find "dead" sockets. I propose
that we have a thread that once a minute (if the connection has been idle) writes a "ping"
message to the socket. The client can detect a dead socket by the resulting error on the write,
so no client side timeout is required. Also note that the ipc server does not need to respond
to the ping, just discard it.

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