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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3245) Provide ability to persist running jobs (extend HADOOP-1876)
Date Fri, 22 Aug 2008 17:28:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624909#action_12624909
] 

dhruba borthakur commented on HADOOP-3245:
------------------------------------------

I like Amar's proposal. It helps administration as well. Many-a-times when we restart the
jobtracker, we would like all task-trackers to check in before the job-tracker starts running
jobs. HDFS has something called "safe-mode" that is automatically triggered when the namenode
restarts. A similar thing wold be very helpful for the JobTracker. IT allows an administrator
to restart a cluster, and then restart other pieces of software (e.g. etl pipelines) before
opening the cluster to run jobs. I would like to open a seperate JIRA for doing this one.

> 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, HADOOP-3245-v5.14.patch, HADOOP-3245-v5.26.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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