TEZ-4328. Import external tez component em-helpers

[jteagles]

No description provided.

[sreenaths]

Looks good to me 👍🏽

[tez-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	13m 26s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 1s	No case conflicting files found.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
-1 ❌	test4tests	0m 0s	The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
		_ master Compile Tests _
+1 💚	mvninstall	13m 12s	master passed
+1 💚	javadoc	0m 44s	master passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javadoc	0m 20s	master passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
		_ Patch Compile Tests _
+1 💚	mvninstall	1m 35s	the patch passed
+1 💚	jshint	10m 31s	There were no new jshint issues.
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	javadoc	0m 19s	the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javadoc	0m 19s	the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
		_ Other Tests _
+1 💚	unit	1m 56s	tez-ui in the patch passed.
+1 💚	asflicense	0m 27s	The patch does not generate ASF License warnings.
		43m 40s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-145/1/artifact/out/Dockerfile
GITHUB PR	#145
Optional Tests	dupname asflicense javac javadoc unit jshint
uname	Linux b5d78e03528c 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/tez.sh
git revision	master / 8c97365
Default Java	Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
Test Results	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-145/1/testReport/
Max. process+thread count	93 (vs. ulimit of 5500)
modules	C: tez-ui U: tez-ui
Console output	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-145/1/console
versions	git=2.25.1 maven=3.6.3 jshint=2.12.0
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