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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9243) Add more useful statistics in the HFile tool
Date Fri, 16 Aug 2013 10:47:47 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13742077#comment-13742077
] 

Anoop Sam John commented on HBASE-9243:
---------------------------------------

{code}
-    public String toString() {
-      return "count: " + count +
{code}
Getting the count of key, value etc will be useful?  How we can get the same now after the
change?

All the addition of new stats LGTM
                
> 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
>            Priority: Minor
>              Labels: newbie
>         Attachments: 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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