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From "Eric Newton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-884) Take advantage of short circuit read for local files
Date Mon, 22 Apr 2013 16:51:15 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13638163#comment-13638163
] 

Eric Newton commented on ACCUMULO-884:
--------------------------------------

It's not just documentation: it needs to be tested.

I'm trying to shorten the list of tickets for 1.5. If you get it done, go ahead and mark it
for 1.5.  Looking at the list today, it's not going to happen.


                
> Take advantage of short circuit read for local files
> ----------------------------------------------------
>
>                 Key: ACCUMULO-884
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-884
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: docs
>            Reporter: Billie Rinaldi
>            Assignee: Keith Turner
>
> This is a new feature in hadoop 1.0.x and some versions of 0.22 and 0.23.  It allows
a client to read directly from disk instead of through a DataNode when the data is stored
locally.  Enabling it involves setting two configuration parameters, the first in hdfs-site.xml
and the second in accumulo-site.xml.  We should make sure this works with Accumulo and recommend
it in the documentation.
> - dfs.block.local-path-access.user is the key in datanode configuration to specify the
user allowed to do short circuit read.
> - dfs.client.read.shortcircuit is the key to enable short circuit read at the client
side configuration.
> See HDFS-2246 and http://hbase.apache.org/book/perf.hdfs.configs.html for more information.

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