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From "binlijin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16398) optimize HRegion computeHDFSBlocksDistribution
Date Wed, 14 Dec 2016 02:29:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15746996#comment-15746996
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binlijin commented on HBASE-16398:
----------------------------------

Ping [~tedyu@apache.org] [~thiruvel] [~enis] 

> optimize HRegion computeHDFSBlocksDistribution
> ----------------------------------------------
>
>                 Key: HBASE-16398
>                 URL: https://issues.apache.org/jira/browse/HBASE-16398
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver
>    Affects Versions: 2.0.0
>            Reporter: binlijin
>            Assignee: binlijin
>             Fix For: 2.0.0
>
>         Attachments: HBASE-16398.patch, HBASE-16398_v2.patch, HBASE-16398_v3.patch, HBASE-16398_v4.patch,
LocatedBlockStatusComparison.java
>
>
> 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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