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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 Thu, 25 Aug 2011 06:54:31 GMT

    [ https://issues.apache.org/jira/browse/HAMA-413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13090823#comment-13090823
] 

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

[NOTE] just found another issue:

{code}

2011-08-25 15:50:39,042 INFO org.apache.hama.bsp.TaskRunner: attempt_201108251548_0001_000005_0
11/08/25 15:50:39 INFO bsp.BSPPeer: >>> cnode2.ucloud:61000
2011-08-25 15:50:39,042 INFO org.apache.hama.bsp.TaskRunner: attempt_201108251548_0001_000005_0
11/08/25 15:50:39 INFO bsp.BSPPeer: 6, 6
2011-08-25 15:50:49,183 INFO org.apache.hadoop.ipc.Server: Error register incrementSuperstepCount
java.lang.IllegalArgumentException: Duplicate metricsName:incrementSuperstepCount
	at org.apache.hadoop.metrics.util.MetricsRegistry.add(MetricsRegistry.java:53)
	at org.apache.hadoop.metrics.util.MetricsTimeVaryingRate.<init>(MetricsTimeVaryingRate.java:89)
	at org.apache.hadoop.metrics.util.MetricsTimeVaryingRate.<init>(MetricsTimeVaryingRate.java:99)
	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:523)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:959)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:955)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:396)
	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:953)
{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, HAMA-413_v05.patch,
HAMA_413_v04.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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