[ACCUMULO-2222] add footnote to documentation regarding rfile placement in HDFS in relation to tserver assignment

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Not A Problem
• Component/s: docs
• Assignee: Unassigned
• Reporter: Arshak Navruzyan
• Created: 18/Jan/14 00:18
• Updated: 23/Feb/21 15:56
• Resolved: 23/Feb/21 15:56

Description

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.