Michael Han created ZOOKEEPER-3793:
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Summary: Request throttling is broken when RequestThrottler is
disabled or configured incorrectly.
Key: ZOOKEEPER-3793
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3793
Project: ZooKeeper
Issue Type: Bug
Components: server
Affects Versions: 3.6.0
Reporter: Michael Han
Assignee: Michael Han
When RequestThrottler is not enabled or is enabled but configured incorrectly,
ZooKeeper server will stop throttling. This is a serious bug as without request
throttling, it's fairly easy to overwhelm ZooKeeper which leads to all sorts of
issues.
This is a regression introduced in ZOOKEEPER-3243, where the total number of
queued requests in request processing pipeline is not taking into consideration
when deciding whether to throttle or not, or only taken into consideration
conditionally based on RequestThrottler's configurations. We should make sure
always taking into account the number of queued requests in request processing
pipeline before making throttling decisions.
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