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From "Hong Tang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1016) Make the format of the Job History be JSON instead of Avro binary
Date Wed, 07 Oct 2009 17:41:32 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12763153#action_12763153

Hong Tang commented on MAPREDUCE-1016:

Maybe I miss something. I am considering a situation where the JobHistory event schemas are
significantly changed and we want to prevent older version of the software from reading job-history
logs produced by the newer version of the software. This is consistent with your comments
here: https://issues.apache.org/jira/browse/MAPREDUCE-980?focusedCommentId=12757389&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12757389.

Again, this would be part of the JobHistory format specification and I think it would make
sense to normalize the format of the version string. Are you saying that maybe we will never
need to have a "avro-json-2.0"? 

Also, what is your opinion on whether job-history format would be fixed on a specific encoder

> Make the format of the Job History be JSON instead of Avro binary
> -----------------------------------------------------------------
>                 Key: MAPREDUCE-1016
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1016
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Owen O'Malley
>            Assignee: Doug Cutting
>             Fix For: 0.21.0, 0.22.0
>         Attachments: MAPREDUCE-1016.patch
> I forgot that one of the features that would be nice is to off load the job history display
from the JobTracker. That will be a lot easier, if the job history is stored in JSON. Therefore,
I think we should change the storage now to prevent incompatibilities later.

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