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https://issues.apache.org/jira/browse/HDFS-16757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17876713#comment-17876713
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ASF GitHub Bot commented on HDFS-16757:
---------------------------------------
LiuGuH commented on code in PR #6926:
URL: https://github.com/apache/hadoop/pull/6926#discussion_r1731210555
##########
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java:
##########
@@ -131,6 +131,7 @@ public class DFSOutputStream extends FSOutputSummer
private FileEncryptionInfo fileEncryptionInfo;
private int writePacketSize;
private boolean leaseRecovered = false;
+ private ExtendedBlock userAssignmentLastBlock;
Review Comment:
This is used for DFSOutputStream.completeFile() . When fastcop a file from
src to dst , and dst is control by outputStream for file lease ,and use
addblock() for create block with dst . When completeFile() is invoked, the
last block should exits. So userAssignmentLastBlock is called when
outputstrem closed.
> 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: Haiyang Hu
> Priority: Minor
> Labels: pull-request-available
>
> 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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