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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1140) Per cache-file refcount can become negative when tasks release distributed-cache files
Date Fri, 13 Nov 2009 12:11:39 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12777476#action_12777476
] 

Hemanth Yamijala commented on MAPREDUCE-1140:
---------------------------------------------

Some comments on the test case:

- Can we refactor TestTrackerDistributedCacheManager and its subclass for LinuxTaskController,
by introducing an API like canRun in the base class. Let it return true and this can be overridden
in TestTrackerDistributedCacheManagerWithLinuxTaskController to return false if the platform
is not Linux. This way, I suppose we don't have to keep overridding every testcase in the
base class everytime we make a change.

- I would enhance testReferenceCount to add 3 files instead of 2, the first file should be
localized correctly, the second should fail after the reference count is incremented, and
the third will not be localized at all. Then we can verify that the reference count for all
files is 0.

 

> Per cache-file refcount can become negative when tasks release distributed-cache files
> --------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1140
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1140
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 0.20.2, 0.21.0, 0.22.0
>            Reporter: Vinod K V
>            Assignee: Amareshwari Sriramadasu
>         Attachments: patch-1140-1.txt, patch-1140-ydist.txt, patch-1140.txt
>
>


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