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Date: Fri, 11 Oct 2013 21:59:43 +0000 (UTC)
From: "Colin Patrick McCabe (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12663732.1376515161387.53989.1381528783028@arcas>
In-Reply-To: <JIRA.12663732.1376515161387@arcas>
References: <JIRA.12663732.1376515161387@arcas>
Subject: [jira] [Updated] (HDFS-5096) Automatically cache new data added to
 a cached path
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     [ 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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