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https://issues.apache.org/jira/browse/HBASE-4516?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mikhail Bautin resolved HBASE-4516.
-----------------------------------
Resolution: Fixed
Resolved as part of HBASE-4218.
> HFile-level load tester with compaction and random-read workloads
> -----------------------------------------------------------------
>
> Key: HBASE-4516
> URL: https://issues.apache.org/jira/browse/HBASE-4516
> Project: HBase
> Issue Type: Test
> Reporter: Mikhail Bautin
> Assignee: Mikhail Bautin
> Priority: Minor
> Fix For: 0.94.0
>
>
> This is a load testing tool for HFile implementations, which supports two
> workloads:
> - Compactions (merge the input HFiles). A special case of this is only one
> input, which allows to do HFile format conversions.
> - Random reads. Launches the specified number of threads that do seeks and
> short scans on randomly generated keys.
> The original purpose of this tool was to ensure that HFile format v2 did not
> introduce performance regressions.
> Keys for the read workload are generated randomly between the first and the
> last key of the HFile. At each position, instead of precisely calculating the
> correct probability for every byte value b, we select a uniformly random byte
> between in the allowed [low, high] range. In addition, there is a heuristic
> that determines the positions at which the key has hex characters, and the
> random key contains hex characters at those positions as well.
> Example output for the random read workload:
> Time: 120 sec, seek/sec: 8290, kv/sec: 30351, kv bytes/sec: 91868121,
> blk/sec: 10147, unique keys: 232779
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