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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5643) Ability to blacklist tasktracker
Date Tue, 12 May 2009 18:29:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12708549#action_12708549
] 

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

bq. 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.

Then, why not using the name "checkSuperuserPrivilege" for superuser checks in both HDFS and
MR?  "checkAccess" does not seem to mean "check superuser".

Also, "checkAccess" seems to be confusing in HDFS.  In FSNamesystem, there are other methods
checkPathAccess(..), checkParentAccess(..) and checkAncestorAccess(..) which are nothing to
do with superuser.

> 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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