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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3245) Provide ability to persist running jobs (extend HADOOP-1876)
Date Wed, 06 Aug 2008 08:42:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12620175#action_12620175
] 

Amar Kamat commented on HADOOP-3245:
------------------------------------

bq. 1) This approach/patch works fine with history on local fs. With history on HDFS, the
history file becomes visible but not available (i.e file-size = 0). The file becomes available
only on close(). Sync() documentation indicates that the file-data availability is not guaranteed.
The recently uploaded patch makes the block size of the history-file configurable. The parameter
to change it is {{mapred.jobtracker.job.history.block.size}} (in bytes). For testing it, I
started a small job on a single node cluster with history-block-size as {{1k}}. It seems to
work fine and the history file is now visible and available. With respect to the {{zero-size-file}},
I think we are ok to lose some small amount of information.

> Provide ability to persist running jobs (extend HADOOP-1876)
> ------------------------------------------------------------
>
>                 Key: HADOOP-3245
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3245
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: mapred
>            Reporter: Devaraj Das
>            Assignee: Amar Kamat
>         Attachments: HADOOP-3245-v2.5.patch, HADOOP-3245-v2.6.5.patch, HADOOP-3245-v2.6.9.patch,
HADOOP-3245-v4.1.patch, HADOOP-3245-v5.13.patch
>
>
> This could probably extend the work done in HADOOP-1876. This feature can be applied
for things like jobs being able to survive jobtracker restarts.

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