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https://issues.apache.org/jira/browse/HBASE-9243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13742392#comment-13742392
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Jean-Marc Spaggiari commented on HBASE-9243:
--------------------------------------------
Thanks for this patch Alex!
I'm +1.
[~anoopsamjohn], fine with it too?
> 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-9243-1.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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