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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5096) Automatically cache new data added to a cached path
Date Fri, 11 Oct 2013 21:59:43 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5096?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Colin Patrick McCabe updated HDFS-5096:
---------------------------------------

    Attachment: HDFS-5096-caching.006.patch

* rebase on current HDFS-4949 (fixing compile)

* capitalize some log messages in CacheManager

* {{CacheManager#setCachedLocations}}: check for enabled before looking at the {{cachedBlocks}}
map.

* add javadoc for addNewPending* methods in {{CacheManager}}


* add unit test for directory caching, caching with replication factor other than 1.

* add unit test for adding cache directives without having caching enabled.

* rename setActive, etc. to activate, etc.

> 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
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-5096-caching.005.patch, HDFS-5096-caching.006.patch
>
>
> 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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