Walter Su created HADOOP-11676:
----------------------------------
Summary: Add API to NetworkTopology for getting all racks
Key: HADOOP-11676
URL: https://issues.apache.org/jira/browse/HADOOP-11676
Project: Hadoop Common
Issue Type: New Feature
Reporter: Walter Su
The existing two NetworkTopology.chooseRandom(..) API support choosing node
from scope and choosing outside scope. BlockPlacementPolicyDefault class use
these two API to choose node from one rack or choose outside one rack.
We want to implement a new placement policy called
BlockPlacementPolicyFaultTolerant which tries its best to place replicas to
most racks. To achieve this, We need to know how many replicas each rack has.
And first, we need to get all racks.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
