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https://issues.apache.org/jira/browse/HADOOP-18629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17689452#comment-17689452
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ASF GitHub Bot commented on HADOOP-18629:
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zhuyaogai commented on PR #5391:
URL: https://github.com/apache/hadoop/pull/5391#issuecomment-1432392281
@steveloughran hi, thanks for your suggestion:) I know what you mean, but I
find that it also uses the hdfs public/stable API in source code.
https://github.com/apache/hadoop/blob/723535b788070f6b103be3bae621fefe3b753081/hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/mapred/RetriableFileCopyCommand.java#L230
I just refer to its practice in the if branch, and if you think my code
changes affect too much, can I just change the else branch code and add
favoredNodes option in it? Please correct me if I'm wrong. Thank you :)
> 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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