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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9243) Add more useful statistics in the HFile tool
Date Mon, 19 Aug 2013 21:23:49 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13744240#comment-13744240
] 

Hudson commented on HBASE-9243:
-------------------------------

SUCCESS: Integrated in HBase-0.94 #1116 (See [https://builds.apache.org/job/HBase-0.94/1116/])
HBASE-9243. Add more useful statistics in the HFile tool (Alexandre Normand) (apurtell: rev
1515553)
* /hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/io/hfile/HFilePrettyPrinter.java

                
> Add more useful statistics in the HFile tool
> --------------------------------------------
>
>                 Key: HBASE-9243
>                 URL: https://issues.apache.org/jira/browse/HBASE-9243
>             Project: HBase
>          Issue Type: Improvement
>          Components: HFile
>    Affects Versions: 0.96.0
>            Reporter: Alexandre Normand
>            Assignee: Alexandre Normand
>            Priority: Minor
>              Labels: newbie
>             Fix For: 0.98.0, 0.94.11, 0.95.3
>
>         Attachments: HBASE-9243-1.patch, HBASE-9243-2.patch, HBASE-9243.patch
>
>
> The [HFile tool|http://hbase.apache.org/book/regions.arch.html#hfile_tool] has been very
useful to us recently to get a better idea of the size of our rows. However, it happened frequently
that we wished for more statistics to have a more complete picture of the distribution of
the row sizes. 
> [~skuehn] requested that feature often enough in private that I decided to give it a
go. 
> Here's the patch that adds more nice little stats via yammer's histograms. It was easy
enough since {{com.yammer.metrics}} is already in hbase's dependencies.
> Example of the new output from {{org.apache.hadoop.hbase.io.hfile.HFile -s -f ...}}:
> {code}
> Stats:
> 	Key length:
>                min = 24.00
>                max = 24.00
>               mean = 24.00
>             stddev = 0.00
>             median = 24.00
>               75% <= 24.00
>               95% <= 24.00
>               98% <= 24.00
>               99% <= 24.00
>             99.9% <= 24.00
> 	Row size (bytes):
>                min = 33.00
>                max = 33.00
>               mean = 33.00
>             stddev = 0.00
>             median = 33.00
>               75% <= 33.00
>               95% <= 33.00
>               98% <= 33.00
>               99% <= 33.00
>             99.9% <= 33.00
> 	Row size (columns):
>                min = 1.00
>                max = 1.00
>               mean = 1.00
>             stddev = 0.00
>             median = 1.00
>               75% <= 1.00
>               95% <= 1.00
>               98% <= 1.00
>               99% <= 1.00
>             99.9% <= 1.00
> 	Val length:
>                min = 1.00
>                max = 1.00
>               mean = 1.00
>             stddev = 0.00
>             median = 1.00
>               75% <= 1.00
>               95% <= 1.00
>               98% <= 1.00
>               99% <= 1.00
>             99.9% <= 1.00
> Key of biggest row: \x00
> {code}  

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