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Date: Wed, 22 Jul 2009 09:33:14 -0700 (PDT)
From: "Hemanth Yamijala (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Commented: (MAPREDUCE-766) Enhance
 -list-blacklisted-trackers to display host name, blacklisted reason and
 blacklist report.
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12734183#action_12734183 ] 

Hemanth Yamijala commented on MAPREDUCE-766:
--------------------------------------------

Looking good. A few minor points:

- We are changing the way we print information about blacklisted trackers. Does this need to be backwards compatible ? Similarly, maybe we need not deprecate getBlacklistedTrackerNames()
- The print format should be parse friendly. We are adding white space to separate reasons for blacklisting and the report can have newlines. These will make it difficult to parse. Can we make these comma separated ?
- getBlackListedTracker should be getBlackListedTrackers. Similarly getBlackListedTrackerInfo() should be getBlackListedTrackersInfo() - the former seems like it is for a specific tracker.
- The test class is not applying, possibly due to the commit of MAPREDUCE-682. Also, can you enhance the test case to test for a condition when no nodes are blacklisted, and when there is more than one reason to blacklist ? Maybe one of the trackers can be blacklisted for more than one reason.

> Enhance -list-blacklisted-trackers to display host name, blacklisted reason and blacklist report.
> -------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-766
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-766
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Sreekanth Ramakrishnan
>            Assignee: Sreekanth Ramakrishnan
>         Attachments: mapreduce-766-1.patch, mapreduce-766-2.patch, mapreduce-766-3.patch
>
>
> Currently, the -list-blacklisted-trackers in the mapred job option list only tracker name. We should enhance it to display as hostname, reason for blacklisting and blacklist report.

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