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https://issues.apache.org/jira/browse/HADOOP-10085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13817150#comment-13817150
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Steve Loughran commented on HADOOP-10085:
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# the Concurrency modification is a bug in the composite service -one that
showed up first in the HA RM, but something fairly basic.
# the stricter state of additions goes one further and ensures that the next
state transition of the composite will not fail due to an illegal state
transition attempt of a child.
Lots of child services are added by containers, and I've got some that actually
make the {{addService}} method public for better service composition. The check
locks down what state the children can be in and stops people making mistakes
-at the time of insertion, not state transition.
> CompositeService should allow adding services while being inited
> ----------------------------------------------------------------
>
> Key: HADOOP-10085
> URL: https://issues.apache.org/jira/browse/HADOOP-10085
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 2.2.0
> Reporter: Karthik Kambatla
> Assignee: Steve Loughran
> Attachments: HADOOP-10085-002.patch
>
>
> We can add services to a CompositeService. However, if we do that while
> initing the CompositeService, it leads to a ConcurrentModificationException.
> It would be nice to allow adding services even during the init of
> CompositeService.
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