Add a method to BlockPlacementPolicy for not removing the chosen nodes
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Key: HDFS-1629
URL: https://issues.apache.org/jira/browse/HDFS-1629
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Tsz Wo (Nicholas), SZE
Assignee: Tsz Wo (Nicholas), SZE
{{BlockPlacementPolicy}} supports chosen nodes in some of the
{{chooseTarget(..)}} methods. The chosen nodes will be removed from the output
array. For adding new datanodes to an existing pipeline, it is useful to keep
the chosen nodes in the output array.
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