ZanderXu created HDFS-16757:
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Summary: Add a new method copyBlockCrossNamespace to DataNode
Key: HDFS-16757
URL: https://issues.apache.org/jira/browse/HDFS-16757
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: ZanderXu
Assignee: ZanderXu
Add a new method copyBlockCrossNamespace in DataTransferProtocol at the
DataNode Side.
This method will copy a source block from one namespace to a target block from
a different namespace. If the target DN is the same with the current DN, this
method will copy the block via HardLink. If the target DN is different with the
current DN, this method will copy the block via TransferBlock.
This method will contains some parameters:
* ExtendedBlock sourceBlock
* Token<BlockTokenIdentifier> sourceBlockToken
* ExtendedBlock targetBlock
* Token<BlockTokenIdentifier> targetBlockToken
* DatanodeInfo targetDN
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