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Posted to commits@cassandra.apache.org by "Benedict Elliott Smith (Jira)" <ji...@apache.org> on 2022/10/13 07:31:00 UTC
[jira] [Commented] (CASSANDRA-17850) Find a way to get FileDescriptor.fd and sun.nio.ch.FileChannelImpl.fd without opening internals
[ https://issues.apache.org/jira/browse/CASSANDRA-17850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17616836#comment-17616836 ]
Benedict Elliott Smith commented on CASSANDRA-17850:
----------------------------------------------------
You can get them from FileInputStream, FileOutputStream and RandomAccessFile.
But, it might be that we don't really need the file descriptor and can simply use the {{force}} method on {{{}FileChannel{}}}. We can even do this for syncing directories, seemingly. Relevant JDK bug thread where this feature was temporarily broken, tracking a replacement mechanism (that does not yet exist): [https://bugs.openjdk.org/browse/JDK-8080235]
> Find a way to get FileDescriptor.fd and sun.nio.ch.FileChannelImpl.fd without opening internals
> -----------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-17850
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17850
> Project: Cassandra
> Issue Type: Improvement
> Components: Build
> Reporter: Ekaterina Dimitrova
> Priority: Normal
> Fix For: 4.x
>
>
> With Java 17 if we do not add below to the jvm17 server options:
> {code:java}
> --add-opens java.base/sun.nio.ch=ALL-UNNAMED
> --add-opens java.base/java.io=ALL-UNNAMED{code}
> we get on startup (considering I comment out the scripted UDFs and apply a few changes to the startup scripts):
> {code:java}
> ERROR [ScheduledTasks:1] 2022-08-23 12:29:25,652 JVMStabilityInspector.java:68 - Exception in thread Thread[ScheduledTasks:1,5,ScheduledTasks]
> java.lang.AssertionError: java.lang.reflect.InaccessibleObjectException: Unable to make field private int java.io.FileDescriptor.fd accessible: module java.base does not "opens java.io" to unnamed module @11d8ae8b
> at org.apache.cassandra.utils.FBUtilities.getProtectedField(FBUtilities.java:801)
> at org.apache.cassandra.utils.NativeLibrary.<clinit>(NativeLibrary.java:84)
> at org.apache.cassandra.utils.TimeUUID$Generator.hash(TimeUUID.java:496)
> at org.apache.cassandra.utils.TimeUUID$Generator.makeNode(TimeUUID.java:474)
> at org.apache.cassandra.utils.TimeUUID$Generator.makeClockSeqAndNode(TimeUUID.java:452)
> at org.apache.cassandra.utils.TimeUUID$Generator.<clinit>(TimeUUID.java:368)
> at org.apache.cassandra.streaming.StreamingState.<clinit>(StreamingState.java:50)
> at org.apache.cassandra.streaming.StreamManager.<init>(StreamManager.java:257)
> at org.apache.cassandra.streaming.StreamManager.<clinit>(StreamManager.java:58)
> at org.apache.cassandra.service.StorageService.<init>(StorageService.java:376)
> at org.apache.cassandra.service.StorageService.<clinit>(StorageService.java:226)
> at org.apache.cassandra.locator.DynamicEndpointSnitch.updateScores(DynamicEndpointSnitch.java:274)
> at org.apache.cassandra.locator.DynamicEndpointSnitch$1.run(DynamicEndpointSnitch.java:91)
> at org.apache.cassandra.concurrent.ExecutionFailure$1.run(ExecutionFailure.java:133)
> at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
> at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
> at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
> at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
> at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
> at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
> at java.base/java.lang.Thread.run(Thread.java:833)
> Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make field private int java.io.FileDescriptor.fd accessible: module java.base does not "opens java.io" to unnamed module @11d8ae8b
> at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
> at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
> at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:178)
> at java.base/java.lang.reflect.Field.setAccessible(Field.java:172)
> at org.apache.cassandra.utils.FBUtilities.getProtectedField(FBUtilities.java:796)
> ... 20 common frames omitted
> {code}
> and
> {code:java}
> ERROR [ScheduledTasks:1] 2022-08-23 12:31:18,443 JVMStabilityInspector.java:68 - Exception in thread Thread[ScheduledTasks:1,5,ScheduledTasks]
> java.lang.AssertionError: java.lang.reflect.InaccessibleObjectException: Unable to make field private final java.io.FileDescriptor sun.nio.ch.FileChannelImpl.fd accessible: module java.base does not "opens sun.nio.ch" to unnamed module @4c012563
> at org.apache.cassandra.utils.FBUtilities.getProtectedField(FBUtilities.java:801)
> at org.apache.cassandra.utils.NativeLibrary.<clinit>(NativeLibrary.java:87)
> at org.apache.cassandra.utils.TimeUUID$Generator.hash(TimeUUID.java:496)
> at org.apache.cassandra.utils.TimeUUID$Generator.makeNode(TimeUUID.java:474)
> at org.apache.cassandra.utils.TimeUUID$Generator.makeClockSeqAndNode(TimeUUID.java:452)
> at org.apache.cassandra.utils.TimeUUID$Generator.<clinit>(TimeUUID.java:368)
> at org.apache.cassandra.streaming.StreamingState.<clinit>(StreamingState.java:50)
> at org.apache.cassandra.streaming.StreamManager.<init>(StreamManager.java:257)
> at org.apache.cassandra.streaming.StreamManager.<clinit>(StreamManager.java:58)
> at org.apache.cassandra.service.StorageService.<init>(StorageService.java:376)
> at org.apache.cassandra.service.StorageService.<clinit>(StorageService.java:226)
> at org.apache.cassandra.locator.DynamicEndpointSnitch.updateScores(DynamicEndpointSnitch.java:274)
> at org.apache.cassandra.locator.DynamicEndpointSnitch$1.run(DynamicEndpointSnitch.java:91)
> at org.apache.cassandra.concurrent.ExecutionFailure$1.run(ExecutionFailure.java:133)
> at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
> at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
> at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
> at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
> at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
> at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
> at java.base/java.lang.Thread.run(Thread.java:833)
> Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make field private final java.io.FileDescriptor sun.nio.ch.FileChannelImpl.fd accessible: module java.base does not "opens sun.nio.ch" to unnamed module @4c012563
> at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
> at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
> at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:178)
> at java.base/java.lang.reflect.Field.setAccessible(Field.java:172)
> at org.apache.cassandra.utils.FBUtilities.getProtectedField(FBUtilities.java:796)
> ... 20 common frames omitted
> {code}
>
>
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