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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-10552) HFilePerformanceEvaluation.GaussianRandomReadBenchmark fails sometimes.
Date Sun, 16 Feb 2014 19:57:19 GMT
Lars Hofhansl created HBASE-10552:
-------------------------------------

             Summary: HFilePerformanceEvaluation.GaussianRandomReadBenchmark fails sometimes.
                 Key: HBASE-10552
                 URL: https://issues.apache.org/jira/browse/HBASE-10552
             Project: HBase
          Issue Type: Bug
            Reporter: Lars Hofhansl
            Priority: Minor


GaussianRandomReadBenchmark generates seek keys by using a Gaussian distribution with the
mean of N/2 and a sigma of N/10 (N = number of rows used)  and using this key directly to
seek into the HFile. The HFile was seeded with keys from 0-N.

This will fail if we ever generate a key < 0, which is rare, but by no means impossible.
We need to clamp the min and max values to 0 and 2*N, resp.



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