[jira] [Resolved] (KUDU-1977) MetaCache cache hits should avoid ref count incr/decr

["Todd Lipcon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KUDU-1977?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon resolved KUDU-1977.
-------------------------------
       Resolution: Fixed
    Fix Version/s: 1.8.0

Fixed in b2b8fb74dc564b5e55af6406982e80f2efa19f3c

> MetaCache cache hits should avoid ref count incr/decr
> -----------------------------------------------------
>
>                 Key: KUDU-1977
>                 URL: https://issues.apache.org/jira/browse/KUDU-1977
>             Project: Kudu
>          Issue Type: Improvement
>          Components: client, perf
>    Affects Versions: 1.3.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Major
>             Fix For: 1.8.0
>
>
> Looking at CPU consumption of a client using perf tools (including the new perf-c2c tool) I see that metacache hits in multi-threaded writers are rather slow because of the reference count increments and decrements on the MetaCache object.
> In the case of the cache hit, there's no real need to allocate the LookupRpc object, increment ref counts, and then decrement them. Instead we could move the fast-path check out of LookupRpc and save some CPU.



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