[jira] [Closed] (HBASE-16398) optimize HRegion computeHDFSBlocksDistribution

["Andrew Kyle Purtell (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-16398?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Kyle Purtell closed HBASE-16398.
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> 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: 1.4.0, 2.0.0
>            Reporter: Lijin Bin
>            Assignee: Lijin Bin
>            Priority: Major
>             Fix For: 1.4.0, 2.0.0
>
>         Attachments: HBASE-16398.branch-1.v1.patch, HBASE-16398.patch, HBASE-16398_v2.patch, HBASE-16398_v3.patch, HBASE-16398_v4.patch, HBASE-16398_v5.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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