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https://issues.apache.org/jira/browse/MAPREDUCE-3502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13620973#comment-13620973
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Steve Loughran commented on MAPREDUCE-3502:
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ignore that last comment -pasted into wrong issue-
> Review all Service.stop() operations and make sure that they work before a
> service is started
> ---------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-3502
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3502
> Project: Hadoop Map/Reduce
> Issue Type: Task
> Components: mrv2
> Affects Versions: 0.23.0, 0.24.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Attachments: MAPREDUCE-3502.patch, MAPREDUCE-3502.patch
>
> Original Estimate: 24h
> Time Spent: 2.5h
> Remaining Estimate: 21.5h
>
> MAPREDUCE-3431 has shown that some of the key services's shutdown operations
> are not robust against being invoked before the service is started. They need
> to be by
> # not calling other things if the other things are null
> # not being re-entrant (i.e. make synchronized if possible),
> Maybe
> # have a StopService operation that only stops a service if it is live
> # factor out the is-running test from the base service class and make it a
> pre-check for all the child services, so they bail out sooner rather than
> later. This would be the best as it would be the one guaranteed to work
> consistently across all instances, so only one or two would need testing
> my first iteration will skip the sync though it's something to consider.
> Testing: try to create each instance; call stop() straight after
> construction.
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