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From "Billie Rinaldi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-884) Take advantage of short circuit read for local files
Date Wed, 28 Nov 2012 18:38:58 GMT
Billie Rinaldi created ACCUMULO-884:
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             Summary: 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
             Fix For: 1.5.0


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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