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https://issues.apache.org/jira/browse/HADOOP-3343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12596262#action_12596262
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Owen O'Malley commented on HADOOP-3343:
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You should also probably track how many tasks it has run, how many failed, how
many jobs blacklisted it, and when it was last heard from.
> Replace Strings with Objects for representing the slaves in the JobTracker.
> ---------------------------------------------------------------------------
>
> Key: HADOOP-3343
> URL: https://issues.apache.org/jira/browse/HADOOP-3343
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Reporter: Amar Kamat
>
> Currently the JobTracker stores the trackername as a String. JobTracker
> relies on a hack (string parsing) to deduce the hostname/port information
> from the trackername. It would be better if the slaves/trackers are
> represented by an ID and the ID provides certain APIs for getting this
> information. Something like
> {code}
> class TrackerId {
> getHostname()
> getPort()
> toString()
> readFrom()
> write()
> }
> {code}
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