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Posted to common-dev@hadoop.apache.org by "Robert Chansler (JIRA)" <ji...@apache.org> on 2008/10/22 01:58:44 UTC

[jira] Updated: (HADOOP-3961) resource estimation works badly in some cases

     [ https://issues.apache.org/jira/browse/HADOOP-3961?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Chansler updated HADOOP-3961:
------------------------------------

    Release Note:   (was: resource estimation now only kicks in after 10% of maps have completed.)

> resource estimation works badly in some cases
> ---------------------------------------------
>
>                 Key: HADOOP-3961
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3961
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.19.0
>            Reporter: Ari Rabkin
>            Assignee: Ari Rabkin
>            Priority: Blocker
>             Fix For: 0.19.0
>
>         Attachments: resourceEstFix.patch
>
>
> The disk space estimation introduced in HADOOP-657 performs badly under some circumstances.  In particular, if maps have very small output, the initial estimate of output size equals input size throws everything off.
> Fix is to use a smaller initial estimate, and to update it appropriately.

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