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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-2251) PE defaults to 1k rows - uncommon use case, and easy to hit benchmarks
Date Tue, 23 Feb 2010 08:55:27 GMT
PE defaults to 1k rows - uncommon use case, and easy to hit benchmarks

                 Key: HBASE-2251
                 URL: https://issues.apache.org/jira/browse/HBASE-2251
             Project: Hadoop HBase
          Issue Type: Bug
            Reporter: ryan rawson
             Fix For: 0.20.4, 0.21.0

The PerformanceEvaluation uses 1k rows, which I would argue is uncommon, and also provides
an easy to hit performance goal.  Most of the harder performance issues happens at the low
and high side of cell size.  In our own application, our key sizes range from 4 bytes to maybe
100 bytes.  Very rarely 1000 bytes.  If we have large values, they are VERY large, like multiple
k sizes.

Recently a change went into HBase that ran well with PE because the overhead of 1k rows is
very low in memory, but under small rows, the expected performance would be hit much more.
 This is because the per-value overhead (eg: node objects of the skip list/memstore) is amortized
more with 1k values. 

We should make this a tunable setting, and have a low default.  I would argue for a 10-30
byte default.

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