[jira] Updated: (MAPREDUCE-1098) Incorrect synchronization in DistributedCache causes TaskTrackers to freeze up during localization of Cache for tasks.

["Hemanth Yamijala (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1098?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hemanth Yamijala updated MAPREDUCE-1098:
----------------------------------------

    Attachment: patch-1098-7-y20.txt

A more updated version of the patch for earlier hadoop release. Not for commit.

> 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: 0.22.0
>
>         Attachments: MAPREDUCE-1098.patch, MAPREDUCE-1098.patch, MAPREDUCE-1098.patch, patch-1098-0.20.txt, patch-1098-1.txt, patch-1098-2.txt, patch-1098-3.txt, patch-1098-4.txt, patch-1098-5.txt, patch-1098-6.txt, patch-1098-7-y20.txt, patch-1098-7.txt, patch-1098-7.txt, patch-1098-ydist.txt, patch-1098-ydist.txt, patch-1098-ydist.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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