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https://issues.apache.org/jira/browse/ZOOKEEPER-3560?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Enrico Olivelli resolved ZOOKEEPER-3560.
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Fix Version/s: 3.6.0
Resolution: Fixed
Issue resolved by pull request 1098
[https://github.com/apache/zookeeper/pull/1098]
> 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
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.6.0
>
> Time Spent: 3h
> Remaining Estimate: 0h
>
> 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.
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