[jira] [Created] (PHOENIX-3974) Create index may issue a distributed dead lock due lack of handlers

["Sergey Soldatov (JIRA)" <ji...@apache.org>]

Sergey Soldatov created PHOENIX-3974:
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             Summary: Create index may issue a distributed dead lock due lack of handlers
                 Key: PHOENIX-3974
                 URL: https://issues.apache.org/jira/browse/PHOENIX-3974
             Project: Phoenix
          Issue Type: Bug
    Affects Versions: 4.11.0
            Reporter: Sergey Soldatov
            Assignee: Sergey Soldatov


In PHOENIX-3360 we were trying to avoid using index rpc on client side, setting controller manually in Indexer.  But after we moved index creating to server side there is another set of RS-RS communication that comes from UngroupedAggregateRegionObserver with regular priority. That may cause distributed dead lock when all handlers are occupied by index create scanners for user table and inside they are trying to send index updates. To prevent it we need to set controller in UngroupedAggregateRegionObserver in the similar way like we did in Indexer. 




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