HADOOP-19329. Remove direct usage of sun.misc.Signal #7759

pan3793 · 2025-06-24T07:13:41Z

Description of PR

JIRA: HADOOP-19329. Remove direct usage of sun.misc.Signal.

Alternative of #7145

How was this patch tested?

Pass existing UT:

org.apache.hadoop.service.launcher.TestServiceInterruptHandling
org.apache.hadoop.util.TestSignalLogger

with additional manual test to ensure SignalLogger works properly

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-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SignalUtil.java

LuciferYang · 2025-06-24T08:26:01Z

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SignalUtil.java

+              handler.handle(new Signal(args[0]));
+              return null;
+            } else {
+              return method.invoke(proxyObj, args);


Perhaps there's still an issue here... If someone invokes methods like toString(), equals(), hashCode(), etc., on the proxy object, and these invocations don't match the "handle" condition, they will enter the else branch and execute method.invoke(proxyObj, args). However, since proxyObj is the proxy object itself, this will again trigger the InvocationHandler, potentially leading to an infinite recursive call? Is my understanding correct?

you are right, I should forward other method invocations to the proxied object, updated.

hadoop-yetus · 2025-06-24T09:19:07Z

💔 -1 overall

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			_ trunk Compile Tests _
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			_ Patch Compile Tests _
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		124m 4s

Subsystem	Report/Notes
Docker	ClientAPI=1.50 ServerAPI=1.50 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7759/1/artifact/out/Dockerfile
GITHUB PR	#7759
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hadoop-yetus · 2025-06-24T12:37:59Z

💔 -1 overall

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			_ Patch Compile Tests _
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			_ Other Tests _
+1 💚	unit	23m 2s		hadoop-common in the patch passed.
+1 💚	asflicense	1m 5s		The patch does not generate ASF License warnings.
		259m 46s

Subsystem	Report/Notes
Docker	ClientAPI=1.50 ServerAPI=1.50 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7759/2/artifact/out/Dockerfile
GITHUB PR	#7759
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hadoop-yetus · 2025-06-24T12:51:23Z

💔 -1 overall

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			_ trunk Compile Tests _
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			_ Patch Compile Tests _
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			_ Other Tests _
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		214m 50s

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hadoop-yetus · 2025-06-24T12:58:43Z

💔 -1 overall

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			_ trunk Compile Tests _
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		213m 17s

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Docker	ClientAPI=1.50 ServerAPI=1.50 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7759/4/artifact/out/Dockerfile
GITHUB PR	#7759
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hadoop-yetus · 2025-06-24T16:28:28Z

💔 -1 overall

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			_ trunk Compile Tests _
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			_ Other Tests _
+1 💚	unit	18m 56s		hadoop-common in the patch passed.
+1 💚	asflicense	0m 44s		The patch does not generate ASF License warnings.
		138m 43s

Subsystem	Report/Notes
Docker	ClientAPI=1.50 ServerAPI=1.50 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7759/7/artifact/out/Dockerfile
GITHUB PR	#7759
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hadoop-yetus · 2025-06-24T16:49:16Z

💔 -1 overall

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			_ trunk Compile Tests _
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			_ Patch Compile Tests _
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+1 💚	compile	15m 14s		the patch passed with JDK Private Build-1.8.0_452-8u452-ga~~us1-0ubuntu1~~20.04-b09
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			_ Other Tests _
+1 💚	unit	22m 56s		hadoop-common in the patch passed.
+1 💚	asflicense	1m 5s		The patch does not generate ASF License warnings.
		237m 7s

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GITHUB PR	#7759
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Max. process+thread count	1247 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7759/5/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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hadoop-yetus · 2025-06-24T17:38:23Z

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
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-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 _
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			_ Patch Compile Tests _
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			_ Other Tests _
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		214m 2s

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versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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cnauroth

@pan3793 , thank you for the patch. Sorry, I'm a bit confused about how this is working. I thought compilation failed because the classes are no longer present in the JDK. If they are accessible through reflection though, then I guess that means the classes are still there? If so, then why did compilation fail? (Not exported?)

I agree with the intuition to avoid additional dependencies if it's feasible.

...ommon-project/hadoop-common/src/main/java/org/apache/hadoop/service/launcher/IrqHandler.java

pan3793 · 2025-06-25T02:47:29Z

@cnauroth sun.misc.Signal class exists in both JDK 8 and JDK 9+, but it is not a public API, see https://bugs.openjdk.org/browse/JDK-8149750.

If we don't pursue compiling Hadoop using a modern JDK with -release 8(see below), we don't need this patch.

export JAVA_HOME=/path/of/openjdk-17
mvn compile -DskipTests -Djavac.version=8 -Dmaven.compiler.release=8

...
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.10.1:compile (default-compile) on project hadoop-common: Compilation failure: Compilation failure: 
[ERROR] /Users/chengpan/Projects/apache-hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SignalLogger.java:[22,16] package sun.misc does not exist
[ERROR] /Users/chengpan/Projects/apache-hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SignalLogger.java:[23,16] package sun.misc does not exist
[ERROR] /Users/chengpan/Projects/apache-hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SignalLogger.java:[44,43] cannot find symbol
[ERROR]   symbol:   class SignalHandler
[ERROR]   location: class org.apache.hadoop.util.SignalLogger
...

cnauroth

@pan3793 , thank you for the explanation! I'm in favor of the reflection-based approach here as opposed to a new dependency (which would cascade to the numerous projects dependent on Hadoop). I will be +1 pending resolution of a minor code review comment from me and resolution of Checkstyle issues.

I intend to leave this open a little longer though to see if there are different opinions.

hadoop-yetus · 2025-06-26T06:47:57Z

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
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			_ Prechecks _
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-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	37m 18s		trunk passed
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+1 💚	shadedclient	37m 24s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 58s		the patch passed
+1 💚	compile	14m 56s		the patch passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javac	14m 56s		root-jdkUbuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 generated 0 new + 20 unchanged - 15 fixed = 20 total (was 35)
+1 💚	compile	13m 59s		the patch passed with JDK Private Build-1.8.0_452-8u452-ga~~us1-0ubuntu1~~20.04-b09
+1 💚	javac	13m 59s		root-jdkPrivateBuild-1.8.0_452-8u452-ga~~us1-0ubuntu1~~20.04-b09 with JDK Private Build-1.8.0_452-8u452-ga~~us1-0ubuntu1~~20.04-b09 generated 0 new + 20 unchanged - 15 fixed = 20 total (was 35)
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	1m 15s	/results-checkstyle-hadoop-common-project_hadoop-common.txt	hadoop-common-project/hadoop-common: The patch generated 2 new + 0 unchanged - 7 fixed = 2 total (was 7)
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+1 💚	spotbugs	2m 41s		the patch passed
+1 💚	shadedclient	37m 17s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	23m 24s		hadoop-common in the patch passed.
+1 💚	asflicense	1m 7s		The patch does not generate ASF License warnings.
		213m 10s

Subsystem	Report/Notes
Docker	ClientAPI=1.51 ServerAPI=1.51 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7759/8/artifact/out/Dockerfile
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cnauroth

+1 now, though as discussed, I will leave it open a little longer in case other want to comment. Thank you @pan3793 !

Copilot

Pull Request Overview

This PR introduces a dynamic wrapper to remove direct dependencies on sun.misc.Signal and updates existing components to use the new SignalUtil API.

Adds SignalUtil to handle signal creation, handling, and raising via reflection
Refactors SignalLogger and IrqHandler to use SignalUtil.Signal and SignalUtil.Handler instead of sun.misc.Signal/SignalHandler

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SignalUtil.java	New utility class wrapping `sun.misc.Signal` dynamically
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SignalLogger.java	Updated to use `SignalUtil.Signal` and `SignalUtil.Handler`
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/service/launcher/IrqHandler.java	Switched from direct `Signal` usage to `SignalUtil`

Comments suppressed due to low confidence (2)

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SignalUtil.java:66

The inline comment incorrectly references sun.misc.SignalHandler; this delegate holds a sun.misc.Signal instance. Please update the comment.

    private final Object/* sun.misc.SignalHandler */ delegate;

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SignalUtil.java:71

Missing import for Preconditions; add import org.apache.hadoop.util.Preconditions; at the top of the file.

      Preconditions.checkNotNull(name);

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SignalUtil.java

slfan1989 · 2025-06-29T06:39:28Z

@adoroszlai Could you please help review this pr? Thank you very much!

hadoop-yetus · 2025-06-29T20:15:04Z

💔 -1 overall

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-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	42m 51s		trunk passed
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			_ Patch Compile Tests _
+1 💚	mvninstall	0m 56s		the patch passed
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+1 💚	javac	16m 54s		root-jdkUbuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 generated 0 new + 20 unchanged - 15 fixed = 20 total (was 35)
+1 💚	compile	15m 21s		the patch passed with JDK Private Build-1.8.0_452-8u452-ga~~us1-0ubuntu1~~20.04-b09
+1 💚	javac	15m 21s		root-jdkPrivateBuild-1.8.0_452-8u452-ga~~us1-0ubuntu1~~20.04-b09 with JDK Private Build-1.8.0_452-8u452-ga~~us1-0ubuntu1~~20.04-b09 generated 0 new + 20 unchanged - 15 fixed = 20 total (was 35)
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+1 💚	spotbugs	2m 42s		the patch passed
+1 💚	shadedclient	42m 54s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	22m 53s		hadoop-common in the patch passed.
+1 💚	asflicense	1m 6s		The patch does not generate ASF License warnings.
		240m 53s

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GITHUB PR	#7759
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versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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slfan1989 · 2025-07-09T00:32:33Z

@cnauroth From my side, +1 for this PR. If there are no further comments, we will merge it tomorrow.
cc: @pan3793

slfan1989 · 2025-07-12T00:53:45Z

@pan3793 Thanks for the contribution! Merged into trunk. We have already waited for a long time, let's merge this PR into the trunk branch.

cc: @cnauroth @LuciferYang

HADOOP-19329. Remove directly usage of sun.misc.Signal

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github-actions bot added trunk Common labels Jun 24, 2025

pan3793 changed the title ~~HADOOP-19329. Remove directly usage of sun.misc.Signal~~ HADOOP-19329. Remove direct usage of sun.misc.Signal Jun 24, 2025

pan3793 mentioned this pull request Jun 24, 2025

HADOOP-19329. Remove usage of sun.misc.Signal #7145

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LuciferYang reviewed Jun 24, 2025

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address comments

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LuciferYang reviewed Jun 24, 2025

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fix

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static

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style

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pan3793 added 2 commits June 24, 2025 22:02

fix

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type hint

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cnauroth reviewed Jun 24, 2025

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cnauroth reviewed Jun 25, 2025

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remove unused SuppressWarnings

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cnauroth approved these changes Jun 26, 2025

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slfan1989 requested a review from Copilot June 29, 2025 02:10

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slfan1989 requested a review from adoroszlai June 29, 2025 06:37

address Copilot review comments

239cf0f

slfan1989 requested a review from steveloughran July 3, 2025 01:03

slfan1989 approved these changes Jul 9, 2025

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slfan1989 merged commit 5c92d60 into apache:trunk Jul 12, 2025
2 of 4 checks passed

HADOOP-19329. Remove direct usage of sun.misc.Signal #7759

HADOOP-19329. Remove direct usage of sun.misc.Signal #7759

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pan3793 commented Jun 24, 2025 •

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