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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5643) Ability to blacklist tasktracker
Date Tue, 12 May 2009 04:49:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12708318#action_12708318
] 

Amar Kamat commented on HADOOP-5643:
------------------------------------

bq. src/hdfs/org/apache/hadoop/hdfs/server/namenode/PermissionChecker.java becomes an empty
file in trunk. 
We should do a svn delete of this file.

bq. Why renaming the FSNamesystem.checkSuperuserPrivilege() method to checkAccess() even though
it is still for checking superuser privilege?
I feel checkSuperuserPrivilege() should be used for simply checking superuser privilege (without
permission switch which is just in HDFS for now) and checkAccess() for making a guarded call
to checkSuperuserPrivilege(). The reason for doing this was to keep both the MR and HDFS consistent
wrt superuser checks.

> 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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