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Posted to issues@kudu.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2019/06/11 21:15:00 UTC

[jira] [Created] (KUDU-2847) Optimize iteration over selection vector in SerializeRowBlock

Todd Lipcon created KUDU-2847:
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             Summary: Optimize iteration over selection vector in SerializeRowBlock
                 Key: KUDU-2847
                 URL: https://issues.apache.org/jira/browse/KUDU-2847
             Project: Kudu
          Issue Type: Improvement
          Components: perf, tserver
            Reporter: Todd Lipcon


Currently, SerializeRowBlock operates column-by-column, which means we have to iterate over the selection bitmap once for each column. This code isn't particularly well optimized -- in TPCH Q6, about 10% of CPU is spent in BitmapFindFirst. We should look at alternate implementations here that better amortize the bitmap iteration cost across all of the columns and generally micro-optimize it.



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