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https://issues.apache.org/jira/browse/GEODE-5922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bruce J Schuchardt resolved GEODE-5922.
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Resolution: Won't Fix
The fix for this problem has been reverted on develop and all support branches.
The change to use a fair lock instead of Java synchronization caused queuing
to be about 3x slower under heavy load.
> SerialGatewaySenderQueue concurrency is poorly implemented
> ----------------------------------------------------------
>
> Key: GEODE-5922
> URL: https://issues.apache.org/jira/browse/GEODE-5922
> Project: Geode
> Issue Type: Improvement
> Components: wan
> Reporter: Bruce J Schuchardt
> Assignee: Bruce J Schuchardt
> Priority: Major
> Labels: blocks-1.14.0, pull-request-available
> Fix For: 1.8.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> This class uses synchronization on the queue to limit access to one put at a
> time. Synchronization isn't a fair locking mechanism so threads can be
> blocked trying to add events to the queue while other more recent events get
> the lock and insert their events. This causes inconsistent latency which
> I've observed being as long as 30 seconds, causing client connections to be
> shut down by the ClientHealthMonitor.
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