Jie Huang created ZOOKEEPER-3683:
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Summary: Discard requests that are delayed longer than a
configured threshold
Key: ZOOKEEPER-3683
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3683
Project: ZooKeeper
Issue Type: Improvement
Components: server
Reporter: Jie Huang
Fix For: 3.6.0
The RequestThrottler ensures that no requests more than the system can handle
be fed into the request processor pipeline. In the meantime, the throttler
queues all incoming requests and there is nothing to instruct the clients to
slow down.
This new feature will mark all requests that wait in the RequestThrottler
longer that specified throttledOpWaitTime as throttled and such requests will
not see any processing other than being fed down the pipeline preserving the
order of all requests.
The FinalProcessor will issue an error response (new error code: ZTHROTTLEDOP)
for these undigested requests. The intent is for the clients to not retry them
immediately.
Also the fact that throttled requests are unprocessed will speed the entire
work of the pipeline. Throttled requests are not communicated between servers
and only travel thru the server they belong to.
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