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https://issues.apache.org/jira/browse/HBASE-849?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrzej Bialecki updated HBASE-849:
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Attachment: TestHash.java
This simple test calculates the hash a number of times (e.g. 100 mln), both
using the patched version and the old version. Additionally, it checks whether
output values are equal.
Results show a ~3 times speed improvement:
Speed JenkinsHash:
- 49578 ms
Speed JenkinsHashOld:
- 155266 ms
Regression...
- ok.
> Speed improvement in JenkinsHash
> --------------------------------
>
> Key: HBASE-849
> URL: https://issues.apache.org/jira/browse/HBASE-849
> Project: Hadoop HBase
> Issue Type: Improvement
> Components: util
> Affects Versions: 0.2.1
> Reporter: Andrzej Bialecki
> Fix For: 0.2.1
>
> Attachments: jenkins.patch, TestHash.java
>
>
> The JenkinsHash implementation frequently uses a pattern Long.valueOf(
> ..expr..). This is costly, because each time the JVM implicitly creates a new
> Long object.
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