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Date: Sat, 6 Mar 2010 01:43:27 +0000 (UTC)
From: "Scott Chen (JIRA)" <jira@apache.org>
To: mapreduce-dev@hadoop.apache.org
Subject: [jira] Created: (MAPREDUCE-1568) TrackerDistributedCacheManager
 should do deleteLocalPath asynchronously
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TrackerDistributedCacheManager should do deleteLocalPath asynchronously
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                 Key: MAPREDUCE-1568
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1568
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
    Affects Versions: 0.22.0
            Reporter: Scott Chen
            Assignee: Scott Chen
             Fix For: 0.22.0


TrackerDistributedCacheManager.deleteCache() has been improved:
MAPREDUCE-1302 makes TrackerDistributedCacheManager rename the caches in the main thread and then delete them in the background 
MAPREDUCE-1098 avoids global locking while do the renaming (renaming lots of directories can also takes a long time)

But the deleteLocalCache is still in the main thread of TaskRunner.run(). So it will still slow down the task which triggers the deletion (originally this will blocks all tasks, but it is fixed by MAPREDUCE-1098). Other tasks do not wait for the deletion. The task which triggers the deletion should not wait for this either. TrackerDistributedCacheManager should do deleteLocalPath() asynchronously.


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