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Posted to common-issues@hadoop.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2026/03/13 00:31:00 UTC
[jira] [Commented] (HADOOP-19334) Remove usage of sun.misc.Unsafe
[ https://issues.apache.org/jira/browse/HADOOP-19334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18065515#comment-18065515 ]
ASF GitHub Bot commented on HADOOP-19334:
-----------------------------------------
github-actions[bot] commented on PR #8113:
URL: https://github.com/apache/hadoop/pull/8113#issuecomment-4051325326
We're closing this stale PR because it has been open for 100 days with no activity. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
If you feel like this was a mistake, or you would like to continue working on it, please feel free to re-open it and ask for a committer to remove the stale tag and review again.
Thanks all for your contribution.
> Remove usage of sun.misc.Unsafe
> -------------------------------
>
> Key: HADOOP-19334
> URL: https://issues.apache.org/jira/browse/HADOOP-19334
> Project: Hadoop Common
> Issue Type: Bug
> Components: build
> Reporter: yanmin
> Priority: Major
> Labels: pull-request-available
>
> According to [JEP 471|https://openjdk.org/jeps/471], sun.misc.Unsafe becomes deprecated for removal in Java 23. So, the JDK versions before 23 should be able to use it. The problem in the original description probably was due to the Java 9 module problem (need the new --add-exports / --add-opens command line options).
> It is good to remove the use of Unsafe. Just want to clarify the reported problem.
> ----
> h3. Original description
> when we build hadoop in JDK11 runtime based on [HADOOP-19298|https://github.com/apache/hadoop/pull/7085] , JDK11 build is failing as flowing due to: {{package sun.misc does not exist}} in.
>
> This is because that package sun.misc is not supported after jdk11.
>
> The purpose of this JIRA is to replace the .misc.Unsafe.
> related java class:
> {code:java}
> NativeIO.java
> FastByteComparisons.java
> AbstractFuture.java
> ShortCircuitShm.java {code}
>
> {code:java}
> [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] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SignalLogger.java:[22,16] package sun.misc does not exist
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SignalLogger.java:[23,16] package sun.misc does not exist
> [ERROR] /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
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SignalLogger.java:[46,19] cannot find symbol
> [ERROR] symbol: class SignalHandler
> [ERROR] location: class org.apache.hadoop.util.SignalLogger.Handler
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SignalLogger.java:[59,24] cannot find symbol
> [ERROR] symbol: class Signal
> [ERROR] location: class org.apache.hadoop.util.SignalLogger.Handler
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/service/launcher/IrqHandler.java:[26,16] package sun.misc does not exist
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/service/launcher/IrqHandler.java:[27,16] package sun.misc does not exist
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/service/launcher/IrqHandler.java:[42,42] cannot find symbol
> [ERROR] symbol: class SignalHandler
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/service/launcher/IrqHandler.java:[71,11] cannot find symbol
> [ERROR] symbol: class Signal
> [ERROR] location: class org.apache.hadoop.service.launcher.IrqHandler
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/service/launcher/IrqHandler.java:[126,22] cannot find symbol
> [ERROR] symbol: class Signal
> [ERROR] location: class org.apache.hadoop.service.launcher.IrqHandler
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/nativeio/NativeIO.java:[48,16] package sun.misc does not exist
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/FastByteComparisons.java:[27,16] package sun.misc does not exist
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/FastByteComparisons.java:[134,20] cannot find symbol
> [ERROR] symbol: class Unsafe
> [ERROR] location: class org.apache.hadoop.io.FastByteComparisons.LexicographicalComparerHolder.UnsafeComparer
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SignalLogger.java:[50,39] cannot find symbol
> [ERROR] symbol: class Signal
> [ERROR] location: class org.apache.hadoop.util.SignalLogger.Handler
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SignalLogger.java:[50,21] cannot find symbol
> [ERROR] symbol: variable Signal
> [ERROR] location: class org.apache.hadoop.util.SignalLogger.Handler
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SignalLogger.java:[58,5] method does not override or implement a method from a supertype
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/service/launcher/IrqHandler.java:[92,20] cannot find symbol
> [ERROR] symbol: class Signal
> [ERROR] location: class org.apache.hadoop.service.launcher.IrqHandler
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/service/launcher/IrqHandler.java:[93,7] cannot find symbol
> [ERROR] symbol: variable Signal
> [ERROR] location: class org.apache.hadoop.service.launcher.IrqHandler
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/service/launcher/IrqHandler.java:[113,5] cannot find symbol
> [ERROR] symbol: variable Signal
> [ERROR] location: class org.apache.hadoop.service.launcher.IrqHandler
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/service/launcher/IrqHandler.java:[125,3] method does not override or implement a method from a supertype
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/nativeio/NativeIO.java:[901,17] cannot find symbol
> [ERROR] symbol: class Unsafe
> [ERROR] location: class org.apache.hadoop.io.nativeio.NativeIO
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/nativeio/NativeIO.java:[903,7] cannot find symbol
> [ERROR] symbol: class Unsafe
> [ERROR] location: class org.apache.hadoop.io.nativeio.NativeIO
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/nativeio/NativeIO.java:[903,24] cannot find symbol
> [ERROR] symbol: class Unsafe
> [ERROR] location: class org.apache.hadoop.io.nativeio.NativeIO
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/FastByteComparisons.java:[140,22] cannot find symbol
> [ERROR] symbol: class Unsafe
> [ERROR] location: class org.apache.hadoop.io.FastByteComparisons.LexicographicalComparerHolder.UnsafeComparer
> [ERROR] /hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/FastByteComparisons.java:[145,29] cannot find symbol
> [ERROR] symbol: class Unsafe
> [ERROR] -> [Help 1]
> [ERROR]
> [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
> [ERROR] Re-run Maven using the -X switch to enable full debug logging.
> [ERROR]
> [ERROR] For more information about the errors and possible solutions, please read the following articles:
> [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
> [ERROR]
> [ERROR] After correcting the problems, you can resume the build with the command
> [ERROR] mvn <args> -rf :hadoop-common {code}
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