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https://issues.apache.org/jira/browse/PHOENIX-3974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16059764#comment-16059764
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Sergey Soldatov commented on PHOENIX-3974:
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There is a small note. The documentation still says to configure the controller
in hbase-site.xml (which leads that all client side communication can go
through Index rpc and may cause problems with lack of Index handlers and
following dead lock).
> 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
> Attachments: PHOENIX-3974.patch
>
>
> 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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