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From "David Medinets (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-884) Take advantage of short circuit read for local files
Date Mon, 21 Apr 2014 17:26:17 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13975744#comment-13975744
] 

David Medinets commented on ACCUMULO-884:
-----------------------------------------

What is the deliverable for this ticket? Is it a page of documentation on our web site? Is
it part of the Accumulo configuration? Can we specify what tests need to be run as part of
the closure criteria?

> 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: Sub-task
>          Components: docs
>            Reporter: Billie Rinaldi
>
> 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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