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https://issues.apache.org/jira/browse/HDFS-16757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17852037#comment-17852037
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ASF GitHub Bot commented on HDFS-16757:
---------------------------------------
LiuGuH commented on code in PR #5719:
URL: https://github.com/apache/hadoop/pull/5719#discussion_r1625937706
##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataXceiver.java:
##########
@@ -1078,6 +1079,44 @@ public void blockGroupChecksum(final StripedBlockInfo
stripedBlockInfo,
datanode.metrics.addBlockChecksumOp(elapsed());
}
+ @Override
+ public void copyBlockCrossNamespace(
+ final ExtendedBlock srcBlock, final Token<BlockTokenIdentifier>
srcBlockToken,
+ final ExtendedBlock targetBlock, final Token<BlockTokenIdentifier>
targetBlockToken,
+ final DatanodeInfo targetDN) throws IOException {
+ updateCurrentThreadName("Copying block cross namespace " + srcBlock);
+ final DataOutputStream reply = getBufferedOutputStream();
+ try {
+ // Check access
+ checkAccess(reply, true, srcBlock, srcBlockToken,
+ Op.COPY_BLOCK_CROSS_NAMESPACE, BlockTokenIdentifier.AccessMode.COPY);
Review Comment:
If we use namenode.getBlockLocations() , the blockToken AccessMode is
BlockTokenIdentifier.AccessMode.READ. I also test in a real hdfs cluster
with FastCopy.
> 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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