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Date: Mon, 11 May 2009 14:29:19 -0700 (PDT)
From: "Tsz Wo (Nicholas), SZE (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-5643) Ability to blacklist tasktracker
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    [ https://issues.apache.org/jira/browse/HADOOP-5643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12708233#action_12708233 ] 

Tsz Wo (Nicholas), SZE commented on HADOOP-5643:
------------------------------------------------

- src/hdfs/org/apache/hadoop/hdfs/server/namenode/PermissionChecker.java becomes an empty file in trunk.

- Why renaming the FSNamesystem.checkSuperuserPrivilege() method to checkAccess() even though it is still for checking superuser privilege?

> Ability to blacklist tasktracker
> --------------------------------
>
>                 Key: HADOOP-5643
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5643
>             Project: Hadoop Core
>          Issue Type: New Feature
>    Affects Versions: 0.20.0
>            Reporter: Rajiv Chittajallu
>            Assignee: Amar Kamat
>             Fix For: 0.21.0
>
>         Attachments: HADOOP-5643-v3.4.patch, HADOOP-5643-v4.0.patch, HADOOP-5643-v4.6.patch, HADOOP-5643-v5.1.patch, HADOOP-5643-v5.12-testcase.patch, HADOOP-5643-v5.12.patch, HADOOP-5643-v5.5.patch, HADOOP-5643-v5.9.patch
>
>
> Its not always possible to shutdown the tasktracker to stop scheduling tasks on the node. (eg you can't login to the node but the TT is up). 
> This can be via 
>   * mapred.exclude and should be refreshed with out restarting the tasktracker
>   * hadoop job -fail-tracker <tracker id>

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