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From "Philip Zeyliger (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1098) Incorrect synchronization in DistributedCache causes TaskTrackers to freeze up during localization of Cache for tasks.
Date Fri, 16 Oct 2009 16:15:31 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12766579#action_12766579
] 

Philip Zeyliger commented on MAPREDUCE-1098:
--------------------------------------------

Todd recently ran JCarder on some parts of JobTracker, which, as far as I understand it, instruments
lock acquisition during runtime, and then afterward analyzes it for possible locks and races.
 It ought to be possible to systematically run a system like that on a fixed set of programs
to check that they're behaving.  I'll ask him about it.

> Incorrect synchronization in DistributedCache causes TaskTrackers to freeze up during
localization of Cache for tasks.
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1098
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1098
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>            Reporter: Sreekanth Ramakrishnan
>            Assignee: Amareshwari Sriramadasu
>             Fix For: 0.21.0
>
>         Attachments: patch-1098-0.20.txt, patch-1098-1.txt, patch-1098.txt
>
>
> Currently {{org.apache.hadoop.filecache.DistributedCache.getLocalCache(URI, Configuration,
Path, FileStatus, boolean, long, Path, boolean)}} allows only one {{TaskRunner}} thread in
TT to localize {{DistributedCache}} across jobs. Current way of synchronization is across
baseDir this has to be changed to lock on the same baseDir.

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