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Posted to issues@kudu.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2017/04/19 20:48:41 UTC

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

Todd Lipcon created KUDU-1977:
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             Summary: 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


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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