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https://issues.apache.org/jira/browse/HADOOP-18629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17696670#comment-17696670
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ASF GitHub Bot commented on HADOOP-18629:
-----------------------------------------
zhuyaogai commented on code in PR #5391:
URL: https://github.com/apache/hadoop/pull/5391#discussion_r1125847429
##########
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/mapred/RetriableFileCopyCommand.java:
##########
@@ -223,9 +233,25 @@ private long copyToFile(Path targetPath, FileSystem
targetFS,
FSDataOutputStream out;
ChecksumOpt checksumOpt = getChecksumOpt(fileAttributes, sourceChecksum);
if (!preserveEC || ecPolicy == null) {
- out = targetFS.create(targetPath, permission,
- EnumSet.of(CreateFlag.CREATE, CreateFlag.OVERWRITE),
copyBufferSize,
- repl, blockSize, context, checksumOpt);
+ if (targetFS instanceof DistributedFileSystem
Review Comment:
Thank you for your code review and so many valuable comments！
> Hadoop DistCp supports specifying favoredNodes for data copying
> ---------------------------------------------------------------
>
> Key: HADOOP-18629
> URL: https://issues.apache.org/jira/browse/HADOOP-18629
> Project: Hadoop Common
> Issue Type: New Feature
> Components: tools/distcp
> Affects Versions: 3.3.4
> Reporter: zhuyaogai
> Priority: Major
> Labels: pull-request-available
>
> When importing large scale data to HBase, we always generate the hfiles with
> other Hadoop cluster, use the Distcp tool to copy the data to the HBase
> cluster, and bulkload data to HBase table. However, the data locality is
> rather low which may result in high query latency. After taking a compaction
> it will recover. Therefore, we can increase the data locality by specifying
> the favoredNodes in Distcp.
> Could I submit a pull request to optimize it?
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