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Date: Sat, 7 Jan 2017 12:46:58 +0000 (UTC)
From: "Ashish Singhi (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-14061) Support CF-level Storage Policy
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archived-at: Sat, 07 Jan 2017 12:47:01 -0000


    [ https://issues.apache.org/jira/browse/HBASE-14061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15807447#comment-15807447 ] 

Ashish Singhi commented on HBASE-14061:
---------------------------------------

lgtm

> Support CF-level Storage Policy
> -------------------------------
>
>                 Key: HBASE-14061
>                 URL: https://issues.apache.org/jira/browse/HBASE-14061
>             Project: HBase
>          Issue Type: Sub-task
>          Components: HFile, regionserver
>         Environment: hadoop-2.6.0
>            Reporter: Victor Xu
>            Assignee: Yu Li
>         Attachments: HBASE-14061-master-v1.patch, HBASE-14061.v2.patch, HBASE-14061.v3.patch, HBASE-14061.v4.patch
>
>
> After reading [HBASE-12848|https://issues.apache.org/jira/browse/HBASE-12848] and [HBASE-12934|https://issues.apache.org/jira/browse/HBASE-12934], I wrote a patch to implement cf-level storage policy. 
> My main purpose is to improve random-read performance for some really hot data, which usually locates in certain column family of a big table.
> Usage:
> $ hbase shell
> > alter 'TABLE_NAME', METADATA => {'hbase.hstore.block.storage.policy' => 'POLICY_NAME'}
> > alter 'TABLE_NAME', {NAME=>'CF_NAME', METADATA => {'hbase.hstore.block.storage.policy' => 'POLICY_NAME'}}
> HDFS's setStoragePolicy can only take effect when new hfile is created in a configured directory, so I had to make sub directories(for each cf) in region's .tmp directory and set storage policy for them.
> Besides, I had to upgrade hadoop version to 2.6.0 because dfs.getStoragePolicy cannot be easily written in reflection, and I needed this api to finish my unit test.


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