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https://issues.apache.org/jira/browse/GEODE-7863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17063540#comment-17063540
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ASF subversion and git services commented on GEODE-7863:
--------------------------------------------------------

Commit 4ede81abb2393bddbfb0e297cfc7bdfa3fee800b in geode's branch 
refs/heads/release/1.12.0 from Juan José Ramos
[ https://gitbox.apache.org/repos/asf?p=geode.git;h=4ede81a ]

GEODE-7863: Reduce ServerCQImpl Contention (#4798)

We don't need to lock the entire internal cache for Partitioned
regions so the implementation is now split by region type, this will
us to improve/change them independently in the future.

- Removed redundant checks.
- Keep current behavior for Replicate Regions.
- Use ConcurrentMap instead of locking the entire internal cache on
every operation for Partition Regions.
- Keep the lock on ServerCQImpl instance only while executing the
query and leave stats operations outside of the synchronized block.

(cherry picked from commit 9e3c473e9cf6d72126d0e84319b1192a5e2b6fdb)


> Reduce Contention on ServerCQImpl
> ---------------------------------
>
>                 Key: GEODE-7863
>                 URL: https://issues.apache.org/jira/browse/GEODE-7863
>             Project: Geode
>          Issue Type: Bug
>          Components: cq
>            Reporter: Juan Ramos
>            Assignee: Juan Ramos
>            Priority: Major
>              Labels: GeodeCommons
>             Fix For: 1.13.0
>
>          Time Spent: 2h 10m
>  Remaining Estimate: 0h
>
> While looking at some performance issues recently introduced into {{Geode}} 
> I've noticed that the several methods from the {{ServerCQImpl}} class 
> internally lock an internal {{HashMap}}, it would be better to use a 
> {{ConcurrentMap}} instead.



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