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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:
----------------------------
Resolution: Invalid
Status: Resolved (was: Patch Available)
Not everyone uses NodeGroup. It's not worth complicating default policy. Close
it as Invalid.
> 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
> Labels: BlockPlacementPolicy
> Attachments: HDFS-8390.001.patch, HDFS-8390.002.patch,
> HDFS-8390.003.patch, HDFS-8390.004.patch
>
>
> We saw requirements for adding new policies.( HDFS-7613, HDFS-7892,
> HDFS-8131, 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
> BlockPlacementPolicyWithNodeGroup
> BlockPlacementPolicyCustomized2WithNodeGroup extends
> BlockPlacementPolicyWithNodeGroup
> BlockPlacementPolicyCustomized3WithNodeGroup extends
> BlockPlacementPolicyWithNodeGroup
> {noformat}
> We had better merge nodeGroup awareness into default policy. So every new
> policy only need to extends BlockPlacementPolicyDefault.
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