Maven可以创build文件夹和locking文件，但下载时会挂起
我有一个maven构build，我使用Docker中心的官方maven镜像在Docker容器中运行。 .m2目录被挂载到一个NFS共享。
这个工作在一个环境中，但是在另一个相同的环境中，在写入locking文件之后，它总是会挂起。 它从来没有完成下载，但永远挂在那里。 由于mavendebugging没有给我任何细节后，它挂起点，我决定看.m2目录，看看发生了什么。
ubuntu@kubernetes-dev-nfs-pv:/nfs-shares/jenkins/.m2$ inotifywait -m -r . Setting up watches. Beware: since -r was given, this may take a while! Watches established. ./ CREATE,ISDIR repository ./ OPEN,ISDIR repository ./ CLOSE_NOWRITE,CLOSE,ISDIR repository ./repository/ CREATE,ISDIR org ./repository/ OPEN,ISDIR org ./repository/ CLOSE_NOWRITE,CLOSE,ISDIR org ./repository/org/ CREATE,ISDIR springframework ./repository/org/ OPEN,ISDIR springframework ./repository/org/ CLOSE_NOWRITE,CLOSE,ISDIR springframework ./repository/org/springframework/ CREATE,ISDIR boot ./repository/org/springframework/ OPEN,ISDIR boot ./repository/org/springframework/ CLOSE_NOWRITE,CLOSE,ISDIR boot ./repository/org/springframework/boot/ CREATE,ISDIR spring-boot-starter-parent ./repository/org/springframework/boot/ OPEN,ISDIR spring-boot-starter-parent ./repository/org/springframework/boot/ CLOSE_NOWRITE,CLOSE,ISDIR spring-boot-starter-parent ./repository/org/springframework/boot/spring-boot-starter-parent/ CREATE,ISDIR 1.3.7.RELEASE ./repository/org/springframework/boot/spring-boot-starter-parent/ OPEN,ISDIR 1.3.7.RELEASE ./repository/org/springframework/boot/spring-boot-starter-parent/ CLOSE_NOWRITE,CLOSE,ISDIR 1.3.7.RELEASE ./repository/org/springframework/boot/spring-boot-starter-parent/1.3.7.RELEASE/ CREATE spring-boot-starter-parent-1.3.7.RELEASE.pom.part.lock Maven似乎正在工作，它创build了一些文件夹，甚至locking文件，但它然后挂起。 我怎样才能完成maven或find一些额外的信息来帮助我解决这个问题。
顺便说一句，如果我在容器内使用临时存储，它会按预期下载软件包。
UDPATE：其中一条评论提示了一个线程转储。 下面你可以看到我连接到正在运行的容器。 我确认容器可以修改.m2目录中的文件，然后使用jstack获取进程的线程转储。
ec2-user@murano-necrhj0ld3vkx4-kube-3-gm5dmsfnftxn:~$ sudo docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES c7d1f4c91559 maven:alpine "cat" About an hour ago Up About an hour agitated_cori ec2-user@murano-necrhj0ld3vkx4-kube-3-gm5dmsfnftxn:~$ sudo docker exec -ti c7d1f4c91559 /bin/bash bash-4.3$ ps PID USER TIME COMMAND 1 1000 0:00 cat 6 1000 0:00 sh -c echo $$ > '/var/jenkins_home/workspace/api-product@tmp/durable-ca9825bd/pid'; jsc=durable-04ba6b757bca34373f180bd01ef64ca1; JENKINS_SERVER_COOKIE=$jsc '/var/jenkins_home/workspace/api-product@tmp/durable-ca 12 1000 0:00 {script.sh} /bin/sh -xe /var/jenkins_home/workspace/api-product@tmp/durable-ca9825bd/script.sh 13 1000 0:07 /usr/lib/jvm/java-1.8-openjdk/bin/java -classpath /usr/share/maven/boot/plexus-classworlds-2.5.2.jar -Dclassworlds.conf=/usr/share/maven/bin/m2.conf -Dmaven.home=/usr/share/maven -Dmaven.multiModuleProjectDirecto 1584 1000 0:00 /bin/bash 1589 1000 0:00 ps bash-4.3$ cat /var/jenkins_home/workspace/api-product@tmp/durable-ca9825bd/script.sh #!/bin/sh -xe mvn -Dmaven.repo.local="$PWD"/../../.m2/repository clean compile bash-4.3$ ls -la /var/jenkins_home/.m2/ total 16 drwxr-xr-x 3 1000 1000 4096 May 2 21:14 . drwxrwxr-x 23 1000 1000 4096 May 3 11:55 .. -rw-r--r-- 1 1000 1000 6 May 2 21:14 file.txt drwxr-xr-x 3 1000 1000 4096 May 2 20:50 repository bash-4.3$ cat /var/jenkins_home/.m2/file.txt hello bash-4.3$ vi /var/jenkins_home/.m2/file.txt bash-4.3$ cat /var/jenkins_home/.m2/file.txt hello another bash-4.3$ jstack 13 2017-05-03 13:04:37 Full thread dump OpenJDK 64-Bit Server VM (25.121-b13 mixed mode): "Attach Listener" #11 daemon prio=9 os_prio=0 tid=0x00007fc4a4956800 nid=0x6a7 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Service Thread" #8 daemon prio=9 os_prio=0 tid=0x00007fc4a4343000 nid=0x2c runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C1 CompilerThread2" #7 daemon prio=9 os_prio=0 tid=0x00007fc4a4311800 nid=0x2b waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C2 CompilerThread1" #6 daemon prio=9 os_prio=0 tid=0x00007fc4a4302000 nid=0x2a waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C2 CompilerThread0" #5 daemon prio=9 os_prio=0 tid=0x00007fc4a42ff000 nid=0x29 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Signal Dispatcher" #4 daemon prio=9 os_prio=0 tid=0x00007fc4a42fc800 nid=0x28 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Finalizer" #3 daemon prio=8 os_prio=0 tid=0x00007fc4a42d5000 nid=0x27 in Object.wait() [0x00007fc48ba4b000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000dab108d8> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143) - locked <0x00000000dab108d8> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164) at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209) "Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x00007fc4a42ca800 nid=0x26 in Object.wait() [0x00007fc48bb4c000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000dab18178> (a java.lang.ref.Reference$Lock) at java.lang.Object.wait(Object.java:502) at java.lang.ref.Reference.tryHandlePending(Reference.java:191) - locked <0x00000000dab18178> (a java.lang.ref.Reference$Lock) at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153) "main" #1 prio=5 os_prio=0 tid=0x00007fc4a4179800 nid=0x20 runnable [0x00007fc4a3426000] java.lang.Thread.State: RUNNABLE at sun.nio.ch.FileDispatcherImpl.lock0(Native Method) at sun.nio.ch.FileDispatcherImpl.lock(FileDispatcherImpl.java:90) at sun.nio.ch.FileChannelImpl.tryLock(FileChannelImpl.java:1115) at org.eclipse.aether.connector.basic.PartialFile$LockFile.tryLock(PartialFile.java:135) at org.eclipse.aether.connector.basic.PartialFile$LockFile.lock(PartialFile.java:80) at org.eclipse.aether.connector.basic.PartialFile$LockFile.<init>(PartialFile.java:67) at org.eclipse.aether.connector.basic.PartialFile$Factory.newInstance(PartialFile.java:219) at org.eclipse.aether.connector.basic.BasicRepositoryConnector$GetTaskRunner.runTask(BasicRepositoryConnector.java:441) at org.eclipse.aether.connector.basic.BasicRepositoryConnector$TaskRunner.run(BasicRepositoryConnector.java:359) at org.eclipse.aether.util.concurrency.RunnableErrorForwarder$1.run(RunnableErrorForwarder.java:76) at org.eclipse.aether.connector.basic.BasicRepositoryConnector$DirectExecutor.execute(BasicRepositoryConnector.java:590) at org.eclipse.aether.connector.basic.BasicRepositoryConnector.get(BasicRepositoryConnector.java:258) at org.eclipse.aether.internal.impl.DefaultArtifactResolver.performDownloads(DefaultArtifactResolver.java:529) at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:430) at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:255) at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:232) at org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveArtifact(DefaultRepositorySystem.java:303) at org.apache.maven.project.ProjectModelResolver.resolveModel(ProjectModelResolver.java:193) at org.apache.maven.project.ProjectModelResolver.resolveModel(ProjectModelResolver.java:243) at org.apache.maven.model.building.DefaultModelBuilder.readParentExternally(DefaultModelBuilder.java:1051) at org.apache.maven.model.building.DefaultModelBuilder.readParent(DefaultModelBuilder.java:829) at org.apache.maven.model.building.DefaultModelBuilder.build(DefaultModelBuilder.java:331) at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:429) at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:398) at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:361) at org.apache.maven.graph.DefaultGraphBuilder.collectProjects(DefaultGraphBuilder.java:400) at org.apache.maven.graph.DefaultGraphBuilder.getProjectsForMavenReactor(DefaultGraphBuilder.java:391) at org.apache.maven.graph.DefaultGraphBuilder.build(DefaultGraphBuilder.java:78) at org.apache.maven.DefaultMaven.buildGraph(DefaultMaven.java:511) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:221) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:194) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:107) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:993) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:345) at org.apache.maven.cli.MavenCli.main(MavenCli.java:191) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356) "VM Thread" os_prio=0 tid=0x00007fc4a42c0000 nid=0x25 runnable "GC task thread#0 (ParallelGC)" os_prio=0 tid=0x00007fc4a4190800 nid=0x21 runnable "GC task thread#1 (ParallelGC)" os_prio=0 tid=0x00007fc4a4192000 nid=0x22 runnable "GC task thread#2 (ParallelGC)" os_prio=0 tid=0x00007fc4a4194000 nid=0x23 runnable "GC task thread#3 (ParallelGC)" os_prio=0 tid=0x00007fc4a4195800 nid=0x24 runnable "VM Periodic Task Thread" os_prio=0 tid=0x00007fc4a4382800 nid=0x2d waiting on condition JNI global references: 235 bash-4.3$
在容器内部，我刚刚确认可以访问pom，并显示debugging输出，只是在下载时挂起。
https://gist.github.com/dwatrous/34e1edc1db5e4756d4b33c83a9c2ccd0
这很可能与NFS相关，并且存在文件locking错误和/或语义。
其他人也报告过FileChannel#tryLock over NFS的类似问题; 例如参见JDK-8156026和JDK-8065927 。
该方法的契约说 ， tryLock不会阻塞，所以发生的任何阻塞都是由于本机系统调用不应该返回时。 Maven有可能试图绕过这样的bug，但是我认为任何尝试这样做都会很冒险，也许会引入更多的bug。
您可以尝试不同版本的Java，包括Oracle和OpenJDK，在不同的版本中…