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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6099) Allow configuring the IPC module to send pings
Date Mon, 29 Jun 2009 09:42:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12725099#action_12725099
] 

dhruba borthakur commented on HADOOP-6099:
------------------------------------------

Konstantin commented on this issue via HDFS-278:

"why do you need additional configuration parameter ipc.client.ping?
Can you just use set ipc.ping.interval = -1 and treat it as no ping?
Then by default since ipc.ping.interval parameter is unofficial it will still equal 1 min,
and if you want to turn pings off you will need to specify it. Everything looks consistent
with your plan.
I mean less parameters is better, right?"

I agree that your suggestion is simpler. But the reason I need another parameter is because
I would like the dfsclient to abort if the server is unresponsive for only 20 seconds or so.
Your approach does not let me change the default timeout value of 1 minute. Thats the reason
I need a separate config parameter. Does it make sense?

> Allow configuring the IPC module to send pings
> ----------------------------------------------
>
>                 Key: HADOOP-6099
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6099
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: ipcPing.txt
>
>
> The IPC Client sets a socketTimeout for the time period specified by the pingInterval
and then sends a ping every pingInterval. This means that if a RPC server does not respond
to a RPC client, then the RPC client blocks forever. This is a problem for applications that
wants to switch quickly from one un-responsive HDFS cluster  to a good one. 

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