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Posted to issues@hbase.apache.org by "Ted Yu (JIRA)" <ji...@apache.org> on 2014/02/16 21:18:19 UTC
[jira] [Commented] (HBASE-10552)
HFilePerformanceEvaluation.GaussianRandomReadBenchmark fails sometimes.
[ https://issues.apache.org/jira/browse/HBASE-10552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13902811#comment-13902811 ]
Ted Yu commented on HBASE-10552:
--------------------------------
+1
> 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
> Fix For: 0.96.2, 0.98.1, 0.99.0, 0.94.17
>
> Attachments: 10552-0.94.txt
>
>
> 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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