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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3104) MultithreadMapRunner keeps consuming records even if trheads are not available
Date Fri, 28 Mar 2008 07:34:24 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12582931#action_12582931

Alejandro Abdelnur commented on HADOOP-3104:

per Chris suggestion, catch blocks of InterruptedException now rethrow the exception, but
as a RuntimeException (instead an IOException as he suggested) as I think is more appropriate
as it is not an IO issue.

per Devaraj's suggestion, refactored to use wait-notify in a ThreadPoolExecutor subclass that
uses the wait-notify to make the execute blocking if there are not threads. There is no need
to use a rejection handler anymore. Also refactor the exception check into a method and use
that method in the different parts of the maprunner instead duplicating the exception check

> MultithreadMapRunner keeps consuming records even if trheads are not available
> ------------------------------------------------------------------------------
>                 Key: HADOOP-3104
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3104
>             Project: Hadoop Core
>          Issue Type: Bug
>    Affects Versions: 0.16.1
>         Environment: all
>            Reporter: Alejandro Abdelnur
>            Assignee: Alejandro Abdelnur
>            Priority: Critical
>             Fix For: 0.16.2
>         Attachments: patch3104.txt, patch3104.txt
> The ExecutorService execute() method does not block when there are not threads available,
it queues up the runnables until there are threads. 
> The problem is that all key/values are read and kept in memory for the task, with large
datasets this will create a OOM exception.
> Have to figure out how to use the execute in blocking fashion.

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