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From "Mridul Muralidharan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-542) Cache Miss when machine have multiple hostname
Date Fri, 11 Apr 2014 22:37:14 GMT

    [ https://issues.apache.org/jira/browse/SPARK-542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13967185#comment-13967185
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Mridul Muralidharan commented on SPARK-542:
-------------------------------------------

Spark uses only hostnames - not ip's.
Even for hostnames, it should ideally pick only the canonical hostname - not the others.

This was done by design in 0.8 ... try to find if multiple host names/ip's are all referring
to the same physical host/container is fraught with too many issues.

> Cache Miss when machine have multiple hostname
> ----------------------------------------------
>
>                 Key: SPARK-542
>                 URL: https://issues.apache.org/jira/browse/SPARK-542
>             Project: Spark
>          Issue Type: Bug
>            Reporter: frankvictor
>
> HI, I encountered a weird runtime of pagerank in last few day.
> After debugging the job, I found it was caused by the DNS name.
> The machines of my cluster have multiple hostname, for example, slave 1 have name (c001
and c001.cm.cluster)
> when spark adding cache in cacheTracker, it get "c001" and add cache use it.
> But when schedule task in SimpleJob, the msos offer give spark "c001.cm.cluster".
> so It will never get preferred location!
> I thinks spark should handle the multiple hostname case(by using ip instead of hostname,
or some other methods).
> Thanks!



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