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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14313) Replace/improve Hadoop's byte[] comparator
Date Fri, 28 Apr 2017 10:49:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15988626#comment-15988626
] 

Hadoop QA commented on HADOOP-14313:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  0s{color} | {color:blue}
Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m 10s{color} | {color:red}
HADOOP-14313 does not apply to master. Rebase required? Wrong Branch? See https://wiki.apache.org/hadoop/HowToContribute
for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HADOOP-14313 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12865520/HADOOP-14313.master.002.patch
|
| Console output | https://builds.apache.org/job/PreCommit-HADOOP-Build/12205/console |
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> Replace/improve Hadoop's byte[] comparator
> ------------------------------------------
>
>                 Key: HADOOP-14313
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14313
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: common
>    Affects Versions: 3.0.0-alpha3
>            Reporter: Vikas Vishwakarma
>             Fix For: 3.0.0-alpha3
>
>         Attachments: HADOOP-14313.master.001.patch, HADOOP-14313.master.002.patch
>
>
> Hi,
> Recently we were looking at the Lexicographic byte array comparison in HBase. We did
microbenchmark for the byte array comparator of HADOOP ( https://github.com/hanborq/hadoop/blob/master/src/core/org/apache/hadoop/io/FastByteComparisons.java#L161
) , HBase Vs the latest byte array comparator from guava  ( https://github.com/google/guava/blob/master/guava/src/com/google/common/primitives/UnsignedBytes.java#L362
) and observed that the guava main branch version is much faster. 
> Specifically we see very good improvement when the byteArraySize%8 != 0 and also for
large byte arrays. I will update the benchmark results using JMH for Hadoop vs Guava. For
the jira on HBase, please refer HBASE-17877. 



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