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From "Arshak Navruzyan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-2222) add footnote to documentation regarding rfile placement in HDFS in relation to tserver assignment
Date Sat, 18 Jan 2014 00:18:21 GMT
Arshak Navruzyan created ACCUMULO-2222:
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             Summary: add footnote to documentation regarding rfile placement in HDFS in relation
to tserver assignment
                 Key: ACCUMULO-2222
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2222
             Project: Accumulo
          Issue Type: Improvement
          Components: docs
            Reporter: Arshak Navruzyan


suggest adding a footnote to "2.3.1. Tablet Server."  Perhaps something like this:

HDFS's block placement policy determines which data nodes will hold a replica of the Accumulo
RFile.  The default HDFS placement policy is to put one replica on one node in the local rack,
another on a node in a different (remote) rack, and the last on a different node in the same
remote rack.  (http://hadoop.apache.org/docs/stable1/hdfs_design.html) 

This generally ensures that the server assigned to a particular tablet will be a HDFS replication
location for the tablet's underlying RFile. 




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