HADOOP-17531.Addendum: DistCp: Reduce memory usage on copying huge directories.

[ayushtkn]

Addendum Patch
https://issues.apache.org/jira/browse/HADOOP-17531

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	14m 4s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 1 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	32m 38s		trunk passed
+1 💚	compile	20m 51s		trunk passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	compile	18m 9s		trunk passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	checkstyle	1m 6s		trunk passed
+1 💚	mvnsite	1m 33s		trunk passed
+1 💚	javadoc	1m 6s		trunk passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	javadoc	1m 37s		trunk passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	spotbugs	2m 18s		trunk passed
+1 💚	shadedclient	15m 33s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 54s		the patch passed
+1 💚	compile	20m 11s		the patch passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	javac	20m 11s		the patch passed
+1 💚	compile	18m 16s		the patch passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	javac	18m 16s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	1m 4s		the patch passed
+1 💚	mvnsite	1m 30s		the patch passed
+1 💚	javadoc	1m 2s		the patch passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	javadoc	1m 36s		the patch passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	spotbugs	2m 30s		the patch passed
+1 💚	shadedclient	15m 37s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	17m 19s		hadoop-common in the patch passed.
+1 💚	asflicense	0m 54s		The patch does not generate ASF License warnings.
		190m 19s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2820/1/artifact/out/Dockerfile
GITHUB PR	#2820
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell
uname	Linux 5bd5aac2dfdf 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 8e4f082
Default Java	Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2820/1/testReport/
Max. process+thread count	1260 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2820/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[steveloughran]

+1