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https://issues.apache.org/jira/browse/HDFS-8390?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Walter Su updated HDFS-8390:
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Status: Patch Available (was: Open)
> 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
> Attachments: HDFS-8390.001.patch
>
>
> 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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