HADOOP-19166. Drop "MapReduce_Compatibility_Hadoop1_Hadoop2" page

[lshikqvv]

Description of PR

Drop Migrating from Apache Hadoop 1.x to Apache Hadoop 2.x page & related links.

How was this patch tested?

For code changes:

• 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]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 19s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+0 🆗	markdownlint	0m 0s		markdownlint was not available.
+0 🆗	xmllint	0m 0s		xmllint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+0 🆗	mvndep	10m 4s		Maven dependency ordering for branch
+1 💚	mvninstall	24m 22s		trunk passed
+1 💚	mvnsite	1m 35s		trunk passed
+1 💚	shadedclient	56m 29s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 23s		Maven dependency ordering for patch
+1 💚	mvninstall	0m 59s		the patch passed
-1 ❌	blanks	0m 0s	/blanks-eol.txt	The patch has 1 line(s) that end in blanks. Use git apply --whitespace=fix <<patch_file>>. Refer https://git-scm.com/docs/git-apply
+1 💚	mvnsite	1m 15s		the patch passed
+1 💚	shadedclient	21m 22s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 26s		The patch does not generate ASF License warnings.
		82m 9s

Subsystem	Report/Notes
Docker	ClientAPI=1.51 ServerAPI=1.51 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7981/1/artifact/out/Dockerfile
GITHUB PR	#7981
Optional Tests	dupname asflicense mvnsite codespell detsecrets markdownlint xmllint
uname	Linux 02f0ed14a5c4 5.15.0-143-generic #153-Ubuntu SMP Fri Jun 13 19:10:45 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 9691257
Max. process+thread count	707 (vs. ulimit of 5500)
modules	C: hadoop-project hadoop-common-project/hadoop-common hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7981/1/console
versions	git=2.25.1 maven=3.6.3
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

This message was automatically generated.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 20s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+0 🆗	markdownlint	0m 0s		markdownlint was not available.
+0 🆗	xmllint	0m 0s		xmllint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+0 🆗	mvndep	10m 53s		Maven dependency ordering for branch
+1 💚	mvninstall	24m 43s		trunk passed
+1 💚	mvnsite	1m 37s		trunk passed
+1 💚	shadedclient	57m 30s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 22s		Maven dependency ordering for patch
+1 💚	mvninstall	1m 3s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	1m 16s		the patch passed
+1 💚	shadedclient	21m 22s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 25s		The patch does not generate ASF License warnings.
		82m 2s

Subsystem	Report/Notes
Docker	ClientAPI=1.51 ServerAPI=1.51 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7981/2/artifact/out/Dockerfile
GITHUB PR	#7981
Optional Tests	dupname asflicense mvnsite codespell detsecrets markdownlint xmllint
uname	Linux 1c507e2a8058 5.15.0-143-generic #153-Ubuntu SMP Fri Jun 13 19:10:45 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 25dc84c
Max. process+thread count	550 (vs. ulimit of 5500)
modules	C: hadoop-project hadoop-common-project/hadoop-common hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7981/2/console
versions	git=2.25.1 maven=3.6.3
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

This message was automatically generated.

[iwasakims]

+1. Thanks for the contribution, @lshikqvv.