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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2188) RPC should send a ping rather than use client timeouts
Date Tue, 27 Nov 2007 00:51:43 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12545662
] 

Raghu Angadi commented on HADOOP-2188:
--------------------------------------

> the rpcs are killed at the top of Client.Connection.close.
hmm.. client side does not help the server side. One big issue at the server when it is loaded
is that we will have a lot of RPCs waiting and server patiently executes all of them only
to realize that client side has closed the connection for many of them, this in turn slows
down the other clients, they will close the connections. I think we need Sever to avoid processing
RPCs from connections which are closed already... each handler could check if the connection
has a error.

> RPC should send a ping rather than use client timeouts
> ------------------------------------------------------
>
>                 Key: HADOOP-2188
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2188
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: ipc
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>             Fix For: 0.16.0
>
>         Attachments: 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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