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From "Fangmin Lv (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-3180) Add response cache to improve the throughput of read heavy traffic
Date Thu, 25 Oct 2018 20:41:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-3180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16664257#comment-16664257

Fangmin Lv commented on ZOOKEEPER-3180:

Yes, it holds the serialized response, and re-uses that to serve all the read requests until
there is change invalidated that cache. So it can avoid allocating and deserialize large
response again and again, on our prod, we saw some users are storing more than 4MB data in
a single znode.


> Add response cache to improve the throughput of read heavy traffic 
> -------------------------------------------------------------------
>                 Key: ZOOKEEPER-3180
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3180
>             Project: ZooKeeper
>          Issue Type: Improvement
>          Components: server
>            Reporter: Fangmin Lv
>            Priority: Minor
>             Fix For: 3.6.0
> On read heavy use case with large response data size, the serialization of response takes
time and added overhead to the GC.
> Add response cache helps improving the throughput we can support, which also reduces
the latency in general.
> This Jira is going to implement a LRU cache for the response, which shows some performance
gain on some of our production ensembles.

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