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https://issues.apache.org/jira/browse/HIVE-14864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15536922#comment-15536922
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Vihang Karajgaonkar commented on HIVE-14864:
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I looked into distcp documentation and I think you are right. It creates a list
of files to be copied if src is a directory and this list is divided among a
bunch of CopyMappers to do the actual copy. Do you have any ideas as to how
should we evaluate the threshold of number of files when distcp is beneficial?
> Distcp is not called from MoveTask when src is a directory
> ----------------------------------------------------------
>
> Key: HIVE-14864
> URL: https://issues.apache.org/jira/browse/HIVE-14864
> Project: Hive
> Issue Type: Bug
> Reporter: Vihang Karajgaonkar
> Assignee: Vihang Karajgaonkar
>
> In FileUtils.java the following code does not get executed even when src
> directory size is greater than HIVE_EXEC_COPYFILE_MAXSIZE because
> srcFS.getFileStatus(src).getLen() returns 0 when src is a directory. We
> should use srcFS.getContentSummary(src).getLength() instead.
> {noformat}
> /* Run distcp if source file/dir is too big */
> if (srcFS.getUri().getScheme().equals("hdfs") &&
> srcFS.getFileStatus(src).getLen() >
> conf.getLongVar(HiveConf.ConfVars.HIVE_EXEC_COPYFILE_MAXSIZE)) {
> LOG.info("Source is " + srcFS.getFileStatus(src).getLen() + " bytes.
> (MAX: " + conf.getLongVar(HiveConf.ConfVars.HIVE_EXEC_COPYFILE_MAXSIZE) +
> ")");
> LOG.info("Launch distributed copy (distcp) job.");
> HiveConfUtil.updateJobCredentialProviders(conf);
> copied = shims.runDistCp(src, dst, conf);
> if (copied && deleteSource) {
> srcFS.delete(src, true);
> }
> }
> {noformat}
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