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From "Chengwei Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MESOS-1746) clear TaskStatus data to avoid OOM
Date Fri, 26 Sep 2014 07:08:33 GMT

    [ https://issues.apache.org/jira/browse/MESOS-1746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14148860#comment-14148860
] 

Chengwei Yang commented on MESOS-1746:
--------------------------------------

can anyone help to review?

> clear TaskStatus data to avoid OOM
> ----------------------------------
>
>                 Key: MESOS-1746
>                 URL: https://issues.apache.org/jira/browse/MESOS-1746
>             Project: Mesos
>          Issue Type: Bug
>         Environment: mesos-0.19.0
>            Reporter: Chengwei Yang
>            Assignee: Chengwei Yang
>
> Spark on mesos may use TaskStatus to transfer computed result between worker and scheduler,
the source code like below (spark 1.0.2)
> {code}
>         val serializedResult = {
>           if (serializedDirectResult.limit >= execBackend.akkaFrameSize() -
>               AkkaUtils.reservedSizeBytes) {                                        
                                                                                         
                                                                                         
         
>             logInfo("Storing result for " + taskId + " in local BlockManager")
>             val blockId = TaskResultBlockId(taskId)
>             env.blockManager.putBytes(
>               blockId, serializedDirectResult, StorageLevel.MEMORY_AND_DISK_SER)
>             ser.serialize(new IndirectTaskResult[Any](blockId))                     
                                                                                         
                                                                                         
         
>           } else {                                                                  
                                                                                         
                                                                                         
         
>             logInfo("Sending result for " + taskId + " directly to driver")
>             serializedDirectResult                                                  
                                                                                         
                                                                                         
         
>           }                                                                         
                                                                                         
                                                                                         
         
>         }    
> {code}
> And In our test environment, we enlarge akkaFrameSize to 128MB from default value (10MB)
and this cause our mesos-master process will be OOM in tens of minutes when running spark
tasks in fine-grained mode.
> As you can see, even changed akkaFrameSize back to default value (10MB), it's very likely
to make mesos-master OOM too, however more slower.
> So I think it's good to delete data from TaskStatus since this is only designed to on-top
framework and we don't interested in it.



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