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From "Edward J. Yoon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-413) Remove limitation on the number of tasks
Date Wed, 24 Aug 2011 02:57:29 GMT

    [ https://issues.apache.org/jira/browse/HAMA-413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13089969#comment-13089969
] 

Edward J. Yoon commented on HAMA-413:
-------------------------------------

I ran Pi on physical 16 nodes, but there's a bug of scheduler.

{code}
2011-08-24 11:55:48,930 DEBUG org.apache.hama.bsp.GroomServer: Got Response from BSPMaster
with 4 actions
2011-08-24 11:55:48,931 INFO org.apache.hama.bsp.GroomServer: >>>> attempt_201108241154_0002_000001_0,
61000
2011-08-24 11:55:48,931 INFO org.apache.hama.bsp.GroomServer: >>>> attempt_201108241154_0002_000003_0,
61001
2011-08-24 11:55:48,931 INFO org.apache.hama.bsp.GroomServer: >>>> attempt_201108241154_0002_000005_0,
61002
2011-08-24 11:55:48,931 INFO org.apache.hama.bsp.GroomServer: >>>> attempt_201108241154_0002_000007_0,
61003
2011-08-24 11:55:48,932 INFO org.apache.hama.bsp.GroomServer: xxxx TaskInProgress: org.apache.hama.bsp.BSPJob@4d911540
{code}

> Remove limitation on the number of tasks
> ----------------------------------------
>
>                 Key: HAMA-413
>                 URL: https://issues.apache.org/jira/browse/HAMA-413
>             Project: Hama
>          Issue Type: Sub-task
>          Components: bsp
>    Affects Versions: 0.3.0
>            Reporter: Edward J. Yoon
>            Assignee: Edward J. Yoon
>             Fix For: 0.4.0
>
>         Attachments: HAMA-413_v01.patch, HAMA-413_v02.patch, HAMA-413_v03.patch
>
>
> By HAMA-410 patch, BSPPeer object will be constructed at child process. Now we can just
remove limitation on the number of tasks.
> Here's TODO list:
> 1. The number of tasks per groom should be configurable e.g., 'bsp.local.tasks.maximum'.
> 2. The 'totalTaskCapacity' should be calculated at BSPMaster.getClusterStatus().
> 3. When scheduling tasks, consider how to allocate them.
> 4. Each BSPPeer should know all created peers of Hama cluster by job. It can be listed
based on actions of GroomServer.
> 5. In examples, 'cluster.getGroomServers()' can be changed to 'cluster.getMaxTasks()'.

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