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https://issues.apache.org/jira/browse/HADOOP-17531?focusedWorklogId=570966&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-570966
]
ASF GitHub Bot logged work on HADOOP-17531:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 24/Mar/21 06:49
Start Date: 24/Mar/21 06:49
Worklog Time Spent: 10m
Work Description: ayushtkn commented on a change in pull request #2808:
URL: https://github.com/apache/hadoop/pull/2808#discussion_r600212994
##########
File path:
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/test/GenericTestUtils.java
##########
@@ -896,5 +916,132 @@ public static int getTestsThreadCount() {
}
return threadCount;
}
+ /**
+ * Write the text to a file asynchronously. Logs the operation duration.
+ * @param fs filesystem
+ * @param path path
+ * @return future to the patch created.
+ */
+ private static CompletableFuture<Path> put(FileSystem fs,
+ Path path, String text) {
+ return submit(EXECUTOR, () -> {
+ try (DurationInfo ignore =
+ new DurationInfo(LOG, false, "Creating %s", path)) {
+ createFile(fs, path, true, text.getBytes(Charsets.UTF_8));
Review comment:
Hey @aajisaka
This is actually a backport of https://github.com/apache/hadoop/pull/2732
Will it be ok, if I merge this as is and raise a Addendum PR for trunk as
well?
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Issue Time Tracking
-------------------
Worklog Id: (was: 570966)
Time Spent: 8h 20m (was: 8h 10m)
> DistCp: Reduce memory usage on copying huge directories
> -------------------------------------------------------
>
> Key: HADOOP-17531
> URL: https://issues.apache.org/jira/browse/HADOOP-17531
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Ayush Saxena
> Assignee: Ayush Saxena
> Priority: Critical
> Labels: pull-request-available
> Attachments: MoveToStackIterator.patch, gc-NewD-512M-3.8ML.log
>
> Time Spent: 8h 20m
> Remaining Estimate: 0h
>
> Presently distCp, uses the producer-consumer kind of setup while building the
> listing, the input queue and output queue are both unbounded, thus the
> listStatus grows quite huge.
> Rel Code Part :
> https://github.com/apache/hadoop/blob/trunk/hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/SimpleCopyListing.java#L635
> This goes on bredth-first traversal kind of stuff(uses queue instead of
> earlier stack), so if you have files at lower depth, it will like open up the
> entire tree and the start processing....
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