[jira] [Resolved] (PHOENIX-2910) Avoid synchronous stats lookup in PTable creation while holding row lock

["Josh Elser (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PHOENIX-2910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Josh Elser resolved PHOENIX-2910.
---------------------------------
       Resolution: Duplicate
    Fix Version/s:     (was: 4.8.0)

Closing as a dupe in favor of Nick's PHOENIX-2940 as he has much better details

> Avoid synchronous stats lookup in PTable creation while holding row lock
> ------------------------------------------------------------------------
>
>                 Key: PHOENIX-2910
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-2910
>             Project: Phoenix
>          Issue Type: Improvement
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>
> We've had a number of complaints surrounding contention inside MetaDataEndpointImpl when we're constructing a PTable instance and reading from the stats table. In 4.7 and beyond, there are some new configuration properties which can be used to reduce some of this contention; however, it has been pointed out that doing an RPC to read the stats table while holding a rowlock is a "bad idea".
> I propose that we change this to maintain a cache from the stats table, update this cache in the background, and use this cache when creating PTables.



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