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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5096) Automatically cache new data added to a cached path
Date Thu, 15 Aug 2013 21:06:48 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13741472#comment-13741472
] 

Suresh Srinivas commented on HDFS-5096:
---------------------------------------

As regards to Hive as an application, from HDFS-4949, there was a comment from Arun:
bq. Usually partitions in Hive are new directories. So every 5 or 10 or 15 mins a new directory
is added along with new data. Hence, the ability to automatically cache new files seems redundant.

Could you please comment on this?

I also think this functionality, if we plan to add it in the first phase, we need to understand
the quota implication.
                
> Automatically cache new data added to a cached path
> ---------------------------------------------------
>
>                 Key: HDFS-5096
>                 URL: https://issues.apache.org/jira/browse/HDFS-5096
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, namenode
>            Reporter: Andrew Wang
>
> For some applications, it's convenient to specify a path to cache, and have HDFS automatically
cache new data added to the path without sending a new caching request or a manual refresh
command.
> One example is new data appended to a cached file. It would be nice to re-cache a block
at the new appended length, and cache new blocks added to the file.
> Another example is a cached Hive partition directory, where a user can drop new files
directly into the partition. It would be nice if these new files were cached.
> In both cases, this automatic caching would happen after the file is closed, i.e. block
replica is finalized.

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