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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (HADOOP-2188) RPC should send a ping rather than use client timeouts
Date Wed, 23 Apr 2008 22:07:21 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12591818#action_12591818
] 

rangadi edited comment on HADOOP-2188 at 4/23/08 3:06 PM:
---------------------------------------------------------------

+1. I looked only at the recent change.

We could set {{call.timestamp only inside doRespond() when it is queue to the responder. This
will avoid two calls to getTime() for each RPC in the normal case... not that it will really
be noticeable.

      was (Author: rangadi):
    +1. I looked only at the recent change.

We could set {{call.timestamp only inside doRespond() when it is queue to the responder. This
will avoid two calls to getTime(), not that it will really be noticeable.. 
  
> 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
>         Attachments: ipc-timeout.patch, ipc-timeout1.patch, ipc-timeout2.patch, ipc-timeout3.patch,
ipc-timeout4.patch, ipc-timeout5.patch, ipc-timeout6.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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