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From "binlijin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16398) optimize HRegion computeHDFSBlocksDistribution
Date Mon, 29 Aug 2016 01:11:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15444446#comment-15444446
] 

binlijin commented on HBASE-16398:
----------------------------------

I do have a simple perf, and run 100 rounds to computeHDFSBlocksDistribution for a directory
have 0,1,2,3,4 files.
||number of files||without patch||with patch||
|0|83ms|193ms|
|1|349ms|278ms|
|2|543ms|323ms|
|3|731ms|380ms|
|4|995ms|532ms|                 

> optimize HRegion computeHDFSBlocksDistribution
> ----------------------------------------------
>
>                 Key: HBASE-16398
>                 URL: https://issues.apache.org/jira/browse/HBASE-16398
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: binlijin
>            Assignee: binlijin
>         Attachments: HBASE-16398.patch
>
>
> First i assume there is no reference and link in a region family's directory. 
> Without the patch to computeHDFSBlocksDistribution for a region family, there is 1+2*N
rpc call, N is hfile numbers, The first rpc call is to DistributedFileSystem#listStatus to
get hfiles, for every hfile there is two rpc call DistributedFileSystem#getFileStatus(path)
and then DistributedFileSystem#getFileBlockLocations(status, start, length).
> With the patch to computeHDFSBlocksDistribution for a region family, there is 2 rpc call,
they are DistributedFileSystem#getFileStatus(path) and  DistributedFileSystem#listLocatedStatus(final
Path p, final PathFilter filter).
> So if there is at least one hfile, with the patch, the rpc call will less.



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