[jira] [Updated] (HBASE-10552) HFilePerformanceEvaluation.GaussianRandomReadBenchmark fails sometimes.

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-10552?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Hofhansl updated HBASE-10552:
----------------------------------

    Description: 
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 N, resp.

  was:
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.


> 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 N, resp.



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