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https://issues.apache.org/jira/browse/HIVE-14864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15536989#comment-15536989
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Sergio Peña edited comment on HIVE-14864 at 9/30/16 8:31 PM:
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I run some tests with directories, and distcp is indeed faster than copying
files one at a time. I don't know the threshold, we should investigate with
different files to see it.
was (Author: spena):
I run some tests with directories, and distcp is indeed faster than copying
files one at a time. I don't know the threshold, we should investigate with
different files to see it.
I think this should be included in C5.10 even if we don't use it for S3.
Encryption directories on HDFS will benefit from this too.
> 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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