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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2676) Maintaining cluster information across multiple job submissions
Date Mon, 25 Aug 2008 22:01:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12625530#action_12625530

dhruba borthakur commented on HADOOP-2676:

We could store the information in the JT, but is it ok to not persist it and to not have an
administrator command to remove it from the blacklist? It could be removed from the blacklist
automatically (by an age-ing process).

> Maintaining cluster information across multiple job submissions
> ---------------------------------------------------------------
>                 Key: HADOOP-2676
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2676
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.15.2
>            Reporter: Lohit Vijayarenu
>            Assignee: dhruba borthakur
> Could we have a way to maintain cluster state across multiple job submissions.
> Consider a scenario where we run multiple jobs in iteration on a cluster back to back.
The nature of the job is same, but input/output might differ. 
> Now, if a node is blacklisted in one iteration of job run, it would be useful to maintain
this information and blacklist this node for next iteration of job as well. 
> Another situation which we saw is, if there are failures less than mapred.map.max.attempts
in each iterations few nodes are never marked for blacklisting. But in we consider two or
three iterations, these nodes fail all jobs and should be taken out of cluster. This hampers
overall performance of the job.
> Could have have config variables something which matches a job type (provided by user)
and maintains the cluster status for that job type alone? 

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