TEZ-4365: Use Regex Pattern to Parse DAG ID String

[belugabehr]

[tez-yetus]

:broken_heart: -1 overall

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+1 :green_heart:	unit	0m 30s	tez-common in the patch passed.
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Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-172/1/artifact/out/Dockerfile
GITHUB PR	https://github.com/apache/tez/pull/172
JIRA Issue	TEZ-4365
Optional Tests	dupname asflicense javac javadoc unit spotbugs findbugs checkstyle compile
uname	Linux bb1b434b01c7 4.15.0-163-generic #171-Ubuntu SMP Fri Nov 5 11:55:11 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
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whitespace	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-172/1/artifact/out/whitespace-eol.txt
Test Results	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-172/1/testReport/
Max. process+thread count	91 (vs. ulimit of 5500)
modules	C: tez-common U: tez-common
Console output	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-172/1/console
versions	git=2.25.1 maven=3.6.3 findbugs=3.0.1
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[tez-yetus]

:confetti_ball: +1 overall

Vote	Subsystem	Runtime	Comment
+0 :ok:	reexec	1m 37s	Docker mode activated.
		_ Prechecks _
+1 :green_heart:	dupname	0m 0s	No case conflicting files found.
+1 :green_heart:	@author	0m 0s	The patch does not contain any @author tags.
+1 :green_heart:	test4tests	0m 0s	The patch appears to include 1 new or modified test files.
		_ master Compile Tests _
+1 :green_heart:	mvninstall	14m 42s	master passed
+1 :green_heart:	compile	0m 27s	master passed with JDK Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04
+1 :green_heart:	compile	0m 23s	master passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 :green_heart:	checkstyle	0m 59s	master passed
+1 :green_heart:	javadoc	0m 35s	master passed with JDK Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04
+1 :green_heart:	javadoc	0m 24s	master passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+0 :ok:	spotbugs	1m 1s	Used deprecated FindBugs config; considering switching to SpotBugs.
+1 :green_heart:	findbugs	0m 59s	master passed
		_ Patch Compile Tests _
+1 :green_heart:	mvninstall	0m 15s	the patch passed
+1 :green_heart:	compile	0m 15s	the patch passed with JDK Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04
+1 :green_heart:	javac	0m 15s	the patch passed
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+1 :green_heart:	javac	0m 14s	the patch passed
+1 :green_heart:	checkstyle	0m 8s	the patch passed
+1 :green_heart:	whitespace	0m 0s	The patch has no whitespace issues.
+1 :green_heart:	javadoc	0m 13s	the patch passed with JDK Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04
+1 :green_heart:	javadoc	0m 13s	the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 :green_heart:	findbugs	0m 38s	the patch passed
		_ Other Tests _
+1 :green_heart:	unit	0m 32s	tez-common in the patch passed.
+1 :green_heart:	asflicense	0m 14s	The patch does not generate ASF License warnings.
		23m 44s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-172/2/artifact/out/Dockerfile
GITHUB PR	https://github.com/apache/tez/pull/172
JIRA Issue	TEZ-4365
Optional Tests	dupname asflicense javac javadoc unit spotbugs findbugs checkstyle compile
uname	Linux 8454a0c9589f 4.15.0-163-generic #171-Ubuntu SMP Fri Nov 5 11:55:11 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/tez.sh
git revision	master / c9b8e90db
Default Java	Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Test Results	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-172/2/testReport/
Max. process+thread count	91 (vs. ulimit of 5500)
modules	C: tez-common U: tez-common
Console output	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-172/2/console
versions	git=2.25.1 maven=3.6.3 findbugs=3.0.1
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[jteagles]

@belugabehr, can you go back and run the performance tests in https://issues.apache.org/jira/browse/TEZ-1526. It will be interesting to see how this performs after removing the performance optimizations.

[belugabehr]

@jteagles I create a small driver with JMH:

Benchmark           Mode  Cnt        Score        Error  Units
TestSplit.master   thrpt   30  5324642.492 ± 228078.761  ops/s
TestSplit.tez4365  thrpt   30  1809324.533 ±  37792.272  ops/s

Quite a bit slower, but still an impressive 1,809,324 string per second on my dated hardware. Using regex provides for fewer lines of code and makes it more readable. But your call. If you're not accepting of it, consider the unit tests update.

[jteagles]

This code optimization was critically import as the the event thread spends a significant time parsing task/attempt ids to dispatch messages. I would hate to lose that. I can appreciate the simplicity of REGEX though. Perhaps the regex can be used to validate the manual parsing, as the manual parsing is more error prone. And improved testing is welcome.

This patch inspired a YARN ID parsing improvement that made significant improvements there as well. I've linked the jira for reference in the original. https://issues.apache.org/jira/browse/YARN-6768