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From "Hong Tang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-966) Rumen interface improvement
Date Wed, 09 Sep 2009 22:41:57 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12753309#action_12753309

Hong Tang commented on MAPREDUCE-966:

Proposed changes:
- Isolate the tools dependent on Rumen to three simple interfaces: 
## JobStory (describing a MapReduce job).
## ClusterStory (describing the cluster setup and topology etc) 
## JobStoryProducer that produces a sequence of jobs.
Accordingly, ZombieJob adapts a LoggedJob to JobStory, and ZombieCluster adapts LoggedNetworkTopology
to ClusterStory (indirectly through AbstractClusterStory). Finally ZombieJobProducer reads
rumen traces and produces a sequence of JobStory instances.
- Encapsulate the logic of JSON parsing within Rumen and remove the Parser class. Two reader
classes are added to parse json encoded LoggedJob and LoggedNetworkTopology (JobTraceReader
and ClusterTopologyReader). No throw of Json-specific exceptions from the interface.
- Better sanity check in ZombieJob, and fill in made-up data if the source data are missing
or invalid. 

> Rumen interface improvement
> ---------------------------
>                 Key: MAPREDUCE-966
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-966
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>    Affects Versions: 0.21.0
>            Reporter: Hong Tang
>            Assignee: Hong Tang
> Rumen could expose a cleaner interface to simplify the integration with other tools.

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