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From "Benjamin Reed (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5632) Jobtracker leaves tasktrackers underutilized
Date Tue, 07 Apr 2009 21:56:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12696775#action_12696775
] 

Benjamin Reed commented on HADOOP-5632:
---------------------------------------

owen can you clarify a bit? khaled didn't change the rpc or failure handling at all, so any
new failures would be the same as the old.

> Jobtracker leaves tasktrackers underutilized
> --------------------------------------------
>
>                 Key: HADOOP-5632
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5632
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.18.0, 0.18.1, 0.18.2, 0.18.3, 0.19.0, 0.19.1, 0.20.0
>         Environment: 2x HT 2.8GHz Intel Xeon, 3GB RAM, 4x 250GB HD linux boxes, 100 node
cluster
>            Reporter: Khaled Elmeleegy
>         Attachments: hadoop-khaled-tasktracker.10s.uncompress.timeline.pdf, hadoop-khaled-tasktracker.150ms.uncompress.timeline.pdf,
jobtracker20.patch
>
>
> For some workloads, the jobtracker doesn't keep all the slots utilized even under heavy
load.

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