Michael Han created ZOOKEEPER-3560:
--------------------------------------
Summary: Add response cache to serve get children (2) requests.
Key: ZOOKEEPER-3560
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3560
Project: ZooKeeper
Issue Type: Improvement
Components: server
Reporter: Michael Han
Assignee: Michael Han
ZOOKEEPER-3180 introduces response cache but it only covers getData requests.
This JIRA is to extend the response cache based on the infrastructure set up by
ZOOKEEPER-3180 to so the response of get children requests can also be served
out of cache. Some design decisions:
* Only OpCode.getChildren2 is supported, as OpCode.getChildren does not have
associated stats and current cache infra relies on stats to invalidate cache.
* The children list is stored in a separate response cache object so it does
not pollute the existing data cache that's serving getData requests, and this
separation also allows potential separate tuning of each cache based on
workload characteristics.
* As a result of cache object separation, new server metrics is added to
measure cache hit / miss for get children requests, that's separated from get
data requests.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
