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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-10421) Investigate scan performance in 0.96 and later
Date Sun, 26 Jan 2014 17:39:38 GMT
Lars Hofhansl created HBASE-10421:
-------------------------------------

             Summary: Investigate scan performance in 0.96 and later
                 Key: HBASE-10421
                 URL: https://issues.apache.org/jira/browse/HBASE-10421
             Project: HBase
          Issue Type: Bug
            Reporter: Lars Hofhansl
             Fix For: 0.99.0


Testing the "internal friction" of scanning in HBase (all data in the block cache, and all
rows filtered at the server by a ValueFilter, so that one really measures the work HBase does
internally), I found that 0.98 is almost 35% slower than 0.94.

Scanning 50m rows (one col each, 8 byte keys, 8 byte values) takes 13.2 in 0.94.17-SNAPSHOT
and 18.5s in 0.98.

This probably came about with all the protobuf changes in 0.96.
It should be possible to bring back to par with 0.94.




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