MAPREDUCE-7465: Parallelize file moves in FileOutputCommitter

[steveloughran]

Description of PR

Alternate implement to #6378

Contributed by Rajesh Balamohan.

How was this patch tested?

Not tested this cherrypick from cdh to hadoop trunk; no intent to merge. just putting up to say "this was our interim fix before the manifest committer was complete". note that it was this work which helped identify the abfs rename scale issues.

For code changes:

• [x] Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• [ ] Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• [ ] If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• [ ] If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

[hadoop-yetus]

:broken_heart: -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 :ok:	reexec	0m 31s		Docker mode activated.
			_ Prechecks _
+1 :green_heart:	dupname	0m 0s		No case conflicting files found.
+0 :ok:	codespell	0m 0s		codespell was not available.
+0 :ok:	detsecrets	0m 0s		detect-secrets was not available.
+1 :green_heart:	@author	0m 1s		The patch does not contain any @author tags.
+1 :green_heart:	test4tests	0m 0s		The patch appears to include 2 new or modified test files.
			_ trunk Compile Tests _
+0 :ok:	mvndep	14m 35s		Maven dependency ordering for branch
+1 :green_heart:	mvninstall	31m 2s		trunk passed
+1 :green_heart:	compile	1m 39s		trunk passed with JDK Ubuntu-11.0.21+9-post-Ubuntu-0ubuntu120.04
+1 :green_heart:	compile	1m 32s		trunk passed with JDK Private Build-1.8.0_392-8u392-ga-1~20.04-b08
+1 :green_heart:	checkstyle	1m 10s		trunk passed
+1 :green_heart:	mvnsite	1m 19s		trunk passed
+1 :green_heart:	javadoc	1m 2s		trunk passed with JDK Ubuntu-11.0.21+9-post-Ubuntu-0ubuntu120.04
+1 :green_heart:	javadoc	0m 55s		trunk passed with JDK Private Build-1.8.0_392-8u392-ga-1~20.04-b08
+1 :green_heart:	spotbugs	2m 6s		trunk passed
+1 :green_heart:	shadedclient	32m 11s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 :ok:	mvndep	0m 31s		Maven dependency ordering for patch
-1 :x:	mvninstall	0m 19s	/patch-mvninstall-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.txt	hadoop-mapreduce-client-core in the patch failed.
-1 :x:	mvninstall	0m 23s	/patch-mvninstall-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-jobclient.txt	hadoop-mapreduce-client-jobclient in the patch failed.
-1 :x:	compile	0m 19s	/patch-compile-hadoop-mapreduce-project_hadoop-mapreduce-client-jdkUbuntu-11.0.21+9-post-Ubuntu-0ubuntu120.04.txt	hadoop-mapreduce-client in the patch failed with JDK Ubuntu-11.0.21+9-post-Ubuntu-0ubuntu120.04.
-1 :x:	javac	0m 19s	/patch-compile-hadoop-mapreduce-project_hadoop-mapreduce-client-jdkUbuntu-11.0.21+9-post-Ubuntu-0ubuntu120.04.txt	hadoop-mapreduce-client in the patch failed with JDK Ubuntu-11.0.21+9-post-Ubuntu-0ubuntu120.04.
-1 :x:	compile	0m 19s	/patch-compile-hadoop-mapreduce-project_hadoop-mapreduce-client-jdkPrivateBuild-1.8.0_392-8u392-ga-1~20.04-b08.txt	hadoop-mapreduce-client in the patch failed with JDK Private Build-1.8.0_392-8u392-ga-1~20.04-b08.
-1 :x:	javac	0m 19s	/patch-compile-hadoop-mapreduce-project_hadoop-mapreduce-client-jdkPrivateBuild-1.8.0_392-8u392-ga-1~20.04-b08.txt	hadoop-mapreduce-client in the patch failed with JDK Private Build-1.8.0_392-8u392-ga-1~20.04-b08.
+1 :green_heart:	blanks	0m 0s		The patch has no blanks issues.
-0 :warning:	checkstyle	1m 0s	/results-checkstyle-hadoop-mapreduce-project_hadoop-mapreduce-client.txt	hadoop-mapreduce-project/hadoop-mapreduce-client: The patch generated 15 new + 38 unchanged - 0 fixed = 53 total (was 38)
-1 :x:	mvnsite	0m 20s	/patch-mvnsite-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.txt	hadoop-mapreduce-client-core in the patch failed.
-1 :x:	mvnsite	0m 23s	/patch-mvnsite-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-jobclient.txt	hadoop-mapreduce-client-jobclient in the patch failed.
-1 :x:	javadoc	0m 19s	/patch-javadoc-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core-jdkUbuntu-11.0.21+9-post-Ubuntu-0ubuntu120.04.txt	hadoop-mapreduce-client-core in the patch failed with JDK Ubuntu-11.0.21+9-post-Ubuntu-0ubuntu120.04.
-1 :x:	javadoc	0m 18s	/patch-javadoc-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core-jdkPrivateBuild-1.8.0_392-8u392-ga-1~20.04-b08.txt	hadoop-mapreduce-client-core in the patch failed with JDK Private Build-1.8.0_392-8u392-ga-1~20.04-b08.
-1 :x:	spotbugs	0m 18s	/patch-spotbugs-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.txt	hadoop-mapreduce-client-core in the patch failed.
-1 :x:	spotbugs	0m 23s	/patch-spotbugs-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-jobclient.txt	hadoop-mapreduce-client-jobclient in the patch failed.
-1 :x:	shadedclient	14m 38s		patch has errors when building and testing our client artifacts.
			_ Other Tests _
-1 :x:	unit	0m 21s	/patch-unit-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.txt	hadoop-mapreduce-client-core in the patch failed.
-1 :x:	unit	0m 25s	/patch-unit-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-jobclient.txt	hadoop-mapreduce-client-jobclient in the patch failed.
+1 :green_heart:	asflicense	0m 35s		The patch does not generate ASF License warnings.
		108m 36s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6399/1/artifact/out/Dockerfile
GITHUB PR	https://github.com/apache/hadoop/pull/6399
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 064d3d53fa22 5.15.0-88-generic #98-Ubuntu SMP Mon Oct 2 15:18:56 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 2a53373fe772b8b96c3cc69aab913db508764c27
Default Java	Private Build-1.8.0_392-8u392-ga-1~20.04-b08
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.21+9-post-Ubuntu-0ubuntu120.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_392-8u392-ga-1~20.04-b08
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6399/1/testReport/
Max. process+thread count	560 (vs. ulimit of 5500)
modules	C: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient U: hadoop-mapreduce-project/hadoop-mapreduce-client
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6399/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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