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Posted to hdfs-dev@hadoop.apache.org by "Walter Su (JIRA)" <ji...@apache.org> on 2015/05/13 12:46:00 UTC

[jira] [Created] (HDFS-8390) merge BlockPlacementPolicyWithNodeGroup with default policy

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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