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Posted to notifications@accumulo.apache.org by "Billie Rinaldi (JIRA)" <ji...@apache.org> on 2013/02/11 22:27:14 UTC
[jira] [Commented] (ACCUMULO-884) Take advantage of short circuit
read for local files
[ https://issues.apache.org/jira/browse/ACCUMULO-884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13576140#comment-13576140 ]
Billie Rinaldi commented on ACCUMULO-884:
-----------------------------------------
Looks like HDFS-2246 is a temporary fix until the more involved HDFS-347 is completed. I still think we should try it, though.
> 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
> 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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