HDFS-17923. WebUI file explorer: Trash support, upload progress, rename, and UX improvements

[magnuma3]

Description of PR

HDFS-17923

The WebUI file explorer (/explorer.html) is the main entry point of HDFS for
many users in our environment. Most of them access HDFS through browser
behind Knox gateway, not by hdfs CLI. But current file explorer is missing
some basic features that users expect from a file manager today.

We have run patched version of file explorer on our internal 3.1.2 fork for
more than 2 year. It serves daily user traffic without big issue. We want to
contribute the general part to upstream as one patch.

Adds the following to /explorer.html:

• Open at user's home directory (from WebHDFS GETHOMEDIRECTORY) instead of /.
• Keep current path across login redirect via new ?p=<urlencoded-path> query.
• Show current nameservice name next to the directory input.
• Upload progress bar with percent and elapsed time (per file for multi-file upload).
• Success message in info panel after mkdir / upload.
• Trash support: delete now moves the target to
  <homedir>/.Trash/Current/<path> using op=RENAME&renameoptions=TO_TRASH
  instead of op=DELETE&recursive=true. Two guards reject moving a path
  that is already inside Trash, or that contains Trash root. Destination
  name collision is handled by .1, .2 suffix.
• Direct delete button is removed in this patch.
• Rename file/directory via op=RENAME.
• Show access time next to modification time.
• Submit create-dir and rename input on Enter key.
• "Copy" button to copy fully-qualified hdfs://<ns><path> to clipboard.

Original UI

Enhanced UI

• Upload progress bar

• Trash

How was this patch tested?

manual smoke on a running NameNode

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?

AI Tooling

If an AI tool was used:

• The PR includes the phrase "Contains content generated by "
  where is the name of the AI tool used.
• My use of AI contributions follows the ASF legal policy
  https://www.apache.org/legal/generative-tooling.html

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	18m 13s		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 🆗	xmllint	0m 0s		xmllint was not available.
+0 🆗	jshint	0m 0s		jshint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
-1 ❌	mvninstall	51m 5s	/branch-mvninstall-root.txt	root in trunk failed.
+1 💚	shadedclient	84m 6s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 22s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	shadedclient	32m 21s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 35s		The patch does not generate ASF License warnings.
		138m 21s

Subsystem	Report/Notes
Docker	ClientAPI=1.54 ServerAPI=1.54 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8508/1/artifact/out/Dockerfile
GITHUB PR	#8508
Optional Tests	dupname asflicense shadedclient codespell detsecrets xmllint jshint
uname	Linux 403fbbc1aaee 5.15.0-173-generic #183-Ubuntu SMP Fri Mar 6 13:29:34 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 5147b19
Max. process+thread count	576 (vs. ulimit of 10000)
modules	C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8508/1/console
versions	git=2.43.0 maven=3.9.15
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[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	6m 35s		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 🆗	xmllint	0m 0s		xmllint was not available.
+0 🆗	jshint	0m 0s		jshint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+1 💚	mvninstall	25m 36s		trunk passed
+1 💚	shadedclient	41m 28s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 47s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	shadedclient	15m 7s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 23s		The patch does not generate ASF License warnings.
		65m 23s

Subsystem	Report/Notes
Docker	ClientAPI=1.54 ServerAPI=1.54 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8508/3/artifact/out/Dockerfile
GITHUB PR	#8508
Optional Tests	dupname asflicense shadedclient codespell detsecrets xmllint jshint
uname	Linux 09439704a94a 5.15.0-171-generic #181-Ubuntu SMP Fri Feb 6 22:44:50 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 85cbd78
Max. process+thread count	615 (vs. ulimit of 10000)
modules	C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8508/3/console
versions	git=2.43.0 maven=3.9.15
Powered by	Apache Yetus 0.14.1 https://yetus.apache.org

This message was automatically generated.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 54s		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 🆗	xmllint	0m 0s		xmllint was not available.
+0 🆗	jshint	0m 0s		jshint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+1 💚	mvninstall	47m 28s		trunk passed
+1 💚	shadedclient	81m 38s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 25s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	shadedclient	33m 52s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 36s		The patch does not generate ASF License warnings.
		120m 12s

Subsystem	Report/Notes
Docker	ClientAPI=1.54 ServerAPI=1.54 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8508/2/artifact/out/Dockerfile
GITHUB PR	#8508
Optional Tests	dupname asflicense shadedclient codespell detsecrets xmllint jshint
uname	Linux 5f5eea9cbf8c 5.15.0-173-generic #183-Ubuntu SMP Fri Mar 6 13:29:34 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 1cae069
Max. process+thread count	642 (vs. ulimit of 10000)
modules	C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8508/2/console
versions	git=2.43.0 maven=3.9.15
Powered by	Apache Yetus 0.14.1 https://yetus.apache.org

This message was automatically generated.