You are viewing a plain text version of this content. The canonical link for it is here.
Posted to mapreduce-issues@hadoop.apache.org by "Thomas Graves (JIRA)" <ji...@apache.org> on 2011/07/18 21:57:57 UTC
[jira] [Commented] (MAPREDUCE-2705) tasks localized and launched
serially by TaskLauncher - causing other tasks to be delayed
[ https://issues.apache.org/jira/browse/MAPREDUCE-2705?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13067250#comment-13067250 ]
Thomas Graves commented on MAPREDUCE-2705:
------------------------------------------
Note 1.2MB should be 1.2GB.
> tasks localized and launched serially by TaskLauncher - causing other tasks to be delayed
> -----------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-2705
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2705
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Affects Versions: 0.20.205.0
> Reporter: Thomas Graves
> Assignee: Thomas Graves
>
> The current TaskLauncher serially launches new tasks one at a time. During the launch it does the localization and then starts the map/reduce task. This can cause any other tasks to be blocked waiting for the current task to be localized and started. In some instances we have seen a task that has a large file to localize (1.2MB) block another task for about 40 minutes. This particular task being blocked was a cleanup task which caused the job to be delayed finishing for the 40 minutes.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira