Roman Leventov created YARN-10064:
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Summary: Potential race conditions in AuxServices
Key: YARN-10064
URL: https://issues.apache.org/jira/browse/YARN-10064
Project: Hadoop YARN
Issue Type: Bug
Reporter: Roman Leventov
There are three places in {{AuxServices}} class that may potentially cause race
conditions: {{getServices()}}, {{getServiceRecords()}},
{{handle(AuxServicesEvent event)}}. In the first two methods, synchronized
collections are returned from the API. If they are iterated concurrently with
the underlying collections being updated inside {{AuxServices}},
non-deterministic behavior may follow.
In {{handle(AuxServicesEvent event)}}, {{serviceMap.values()}} is actually
iterated outside of a critical section on {{serviceMap}} object, though it's
unclear from the class itself whether handle() may be called concurrently with
the methods on {{AuxServices}} that modify {{serviceMap}} or not. So if this
not a bug, adding a comment explaining this would be helpful.
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