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From "Sreekanth Ramakrishnan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-6027) After HADOOP-5420, tasks hang when the taskcontroller.cfg has multiple entries for mapred.local.dir
Date Mon, 15 Jun 2009 09:43:07 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-6027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sreekanth Ramakrishnan updated HADOOP-6027:
-------------------------------------------

    Attachment: hadoop-6027-1.patch

Attaching a patch which fixes this issue:

* Advancing the pointer in {{check_tt_root()}} function.
* Fixing a bug in {{MiniMRCluster}} which previous didnt use {{numDir}}
* Modified {{ClusterWithLinuxTaskController}} to always use 4 local directories.

> After HADOOP-5420, tasks hang when the taskcontroller.cfg has multiple entries for mapred.local.dir
> ---------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-6027
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6027
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Vinod K V
>         Attachments: hadoop-6027-1.patch
>
>
> HADOOP-5420 refactored code from taskcontroller.c -> check_tt_root() to configuration.c
for reuse. While doing this, this bug got introduced because of which all tasks hang when
a cluster is configured with multiple mapred local directories. This happens because of the
latest code in check_tt_root() which never advances the mapred_local_dir pointer and gets
stuck in an infinite loop.

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