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Date: Fri, 29 Apr 2016 21:54:13 +0000 (UTC)
From: "Colin Patrick McCabe (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12962494.1461653191000.75201.1461966853136@Atlassian.JIRA>
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Subject: [jira] [Commented] (HDFS-10328) Add cache pool level replication
 managment
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    [ https://issues.apache.org/jira/browse/HDFS-10328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15264841#comment-15264841 ] 

Colin Patrick McCabe commented on HDFS-10328:
---------------------------------------------

Hi [~xupener],

Interesting idea.  However, this doesn't sound like "cache pool level replication management", since the replication management is still per-directive, even after this patch.  This seems like adding a per-cache-pool default.  If you agree, can you update the JIRA name and some of the names in the patch?

> Add cache pool level replication managment 
> -------------------------------------------
>
>                 Key: HDFS-10328
>                 URL: https://issues.apache.org/jira/browse/HDFS-10328
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: caching
>            Reporter: xupeng
>            Assignee: xupeng
>            Priority: Minor
>             Fix For: 2.3.0
>
>         Attachments: HDFS-10328.001.patch
>
>
> For now, hdfs cacheadmin can not set a replication num for cachepool. Each cache directive added in the cache pool should set their own replication num individually. 
> Consider this situation, we add daily hive table into cache pool "hive" .Each time i should set the same replication num for every table directive in the same cache pool.  
> I think we should enable setting a replication num for cachepool that every cache directive in the pool can inherit replication configuration from the pool. Also cache directive can override replication configuration explicitly by calling "add & modify  directive -replication" command from cli.    


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