hadoop-mapreduce-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-1266) Allow heartbeat interval smaller than 3 seconds for tiny clusters
Date Tue, 10 May 2011 23:03:47 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1266?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon resolved MAPREDUCE-1266.
------------------------------------

    Resolution: Duplicate

This was fixed by MAPREDUCE-1906

> Allow heartbeat interval smaller than 3 seconds for tiny clusters
> -----------------------------------------------------------------
>
>                 Key: MAPREDUCE-1266
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1266
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: jobtracker, task, tasktracker
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Priority: Minor
>
> For small clusters, the heartbeat interval has a large effect on job latency. This is
especially true on pseudo-distributed or other "tiny" (<5 nodes) clusters. It's not a big
deal for production, but new users would have a happier first experience if Hadoop seemed
snappier.
> I'd like to change the minimum heartbeat interval from 3.0 seconds to perhaps 0.5 seconds
(but have it governed by an undocumented config parameter in case people don't like this change).
The cluster size-based ramp up of interval will maintain the current scalable behavior for
large clusters with no negative effect.

--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message