Walter Su created HDFS-8390:
-------------------------------
Summary: merge BlockPlacementPolicyWithNodeGroup with default
policy
Key: HDFS-8390
URL: https://issues.apache.org/jira/browse/HDFS-8390
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Walter Su
Assignee: Walter Su
We saw requirements for adding new policies.( HDFS-7613, HDFS-7892, maybe
HDFS-4894, HDFS-7068 in the future). Every policy need to support NodeGroup.
Assume we have N policies:
{noformat}
BlockPlacementPolicyDefault
BlockPlacementPolicyCustomized1 extends BlockPlacementPolicyDefault
BlockPlacementPolicyCustomized2 extends BlockPlacementPolicyDefault
BlockPlacementPolicyCustomized3 extends BlockPlacementPolicyDefault
{noformat}
We need to implements another N policies:
{noformat}
BlockPlacementPolicyyWithNodeGroup
BlockPlacementPolicyCustomized1WithNodeGroup extends
BlockPlacementPolicyyWithNodeGroup
BlockPlacementPolicyCustomized2WithNodeGroup extends
BlockPlacementPolicyyWithNodeGroup
BlockPlacementPolicyCustomized3WithNodeGroup extends
BlockPlacementPolicyyWithNodeGroup
{noformat}
We had better merge nodeGroup awareness into default policy. So every new
policy only need to extends BlockPlacementPolicyDefault.
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