HADOOP-17001. The suffix name of the unified compression

[20100507]

JIRA: https://issues.apache.org/jira/browse/HADOOP-17001

The suffix name of the unified compression class,I think the suffix name in the compression class should be extracted into a constant class, which is helpful for developers to understand the structure of the compression class as a whole.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 8s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	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.
		_ trunk Compile Tests _
+1 💚	mvninstall	22m 1s	trunk passed
-1 ❌	compile	17m 51s	root in trunk failed.
+1 💚	checkstyle	0m 45s	trunk passed
+1 💚	mvnsite	1m 24s	trunk passed
+1 💚	shadedclient	17m 48s	branch has no errors when building and testing our client artifacts.
+1 💚	javadoc	0m 56s	trunk passed
+0 🆗	spotbugs	2m 12s	Used deprecated FindBugs config; considering switching to SpotBugs.
+1 💚	findbugs	2m 10s	trunk passed
		_ Patch Compile Tests _
+1 💚	mvninstall	0m 51s	the patch passed
-1 ❌	compile	17m 41s	root in the patch failed.
-1 ❌	javac	17m 41s	root in the patch failed.
-0 ⚠️	checkstyle	0m 44s	hadoop-common-project/hadoop-common: The patch generated 1 new + 37 unchanged - 0 fixed = 38 total (was 37)
+1 💚	mvnsite	1m 21s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	shadedclient	15m 29s	patch has no errors when building and testing our client artifacts.
+1 💚	javadoc	0m 54s	the patch passed
+1 💚	findbugs	2m 16s	the patch passed
		_ Other Tests _
+1 💚	unit	9m 39s	hadoop-common in the patch passed.
+1 💚	asflicense	0m 46s	The patch does not generate ASF License warnings.
		114m 47s

Subsystem	Report/Notes
Docker	ClientAPI=1.40 ServerAPI=1.40 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1972/1/artifact/out/Dockerfile
GITHUB PR	#1972
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle
uname	Linux e3b8c5f3e0df 4.15.0-74-generic #84-Ubuntu SMP Thu Dec 19 08:06:28 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/hadoop.sh
git revision	trunk / 3d69383
Default Java	Private Build-1.8.0_242-8u242-b08-0ubuntu3~16.04-b08
compile	https://builds.apache.org/job/hadoop-multibranch/job/PR-1972/1/artifact/out/branch-compile-root.txt
compile	https://builds.apache.org/job/hadoop-multibranch/job/PR-1972/1/artifact/out/patch-compile-root.txt
javac	https://builds.apache.org/job/hadoop-multibranch/job/PR-1972/1/artifact/out/patch-compile-root.txt
checkstyle	https://builds.apache.org/job/hadoop-multibranch/job/PR-1972/1/artifact/out/diff-checkstyle-hadoop-common-project_hadoop-common.txt
Test Results	https://builds.apache.org/job/hadoop-multibranch/job/PR-1972/1/testReport/
Max. process+thread count	3233 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-1972/1/console
versions	git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1
Powered by	Apache Yetus 0.12.0 https://yetus.apache.org

This message was automatically generated.

[20100507]

@jojochuang @liuml07 please review ,thank you ~

[jojochuang]

There are compilation errors but don't look related.