[ https://issues.apache.org/jira/browse/FLINK-11402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17336529#comment-17336529 ]
Flink Jira Bot commented on FLINK-11402: ---------------------------------------- This issue was labeled "stale-major" 7 ago and has not received any updates so it is being deprioritized. If this ticket is actually Major, please raise the priority and ask a committer to assign you the issue or revive the public discussion. > User code can fail with an UnsatisfiedLinkError in the presence of multiple > classloaders > ---------------------------------------------------------------------------------------- > > Key: FLINK-11402 > URL: https://issues.apache.org/jira/browse/FLINK-11402 > Project: Flink > Issue Type: Improvement > Components: Documentation, Runtime / Task > Affects Versions: 1.7.0 > Reporter: Ufuk Celebi > Priority: Major > Labels: stale-major, starter > Attachments: hello-snappy-1.0-SNAPSHOT.jar, hello-snappy.tgz > > > As reported on the user mailing list thread "[`env.java.opts` not persisting > after job canceled or failed and then > restarted|https://lists.apache.org/thread.html/37cc1b628e16ca6c0bacced5e825de8057f88a8d601b90a355b6a291@%3Cuser.flink.apache.org%3E]", > there can be issues with using native libraries and user code class loading. > h2. Steps to reproduce > I was able to reproduce the issue reported on the mailing list using > [snappy-java|https://github.com/xerial/snappy-java] in a user program. > Running the attached user program works fine on initial submission, but > results in a failure when re-executed. > I'm using Flink 1.7.0 using a standalone cluster started via > {{bin/start-cluster.sh}}. > 0. Unpack attached Maven project and build using {{mvn clean package}} *or* > directly use attached {{hello-snappy-1.0-SNAPSHOT.jar}} > 1. Download > [snappy-java-1.1.7.2.jar|http://central.maven.org/maven2/org/xerial/snappy/snappy-java/1.1.7.2/snappy-java-1.1.7.2.jar] > and unpack libsnappyjava for your system: > {code} > jar tf snappy-java-1.1.7.2.jar | grep libsnappy > ... > org/xerial/snappy/native/Linux/x86_64/libsnappyjava.so > ... > org/xerial/snappy/native/Mac/x86_64/libsnappyjava.jnilib > ... > {code} > 2. Configure system library path to {{libsnappyjava}} in {{flink-conf.yaml}} > (path needs to be adjusted for your system): > {code} > env.java.opts: -Djava.library.path=/.../org/xerial/snappy/native/Mac/x86_64 > {code} > 3. Run attached {{hello-snappy-1.0-SNAPSHOT.jar}} > {code} > bin/flink run hello-snappy-1.0-SNAPSHOT.jar > Starting execution of program > Program execution finished > Job with JobID ae815b918dd7bc64ac8959e4e224f2b4 has finished. > Job Runtime: 359 ms > {code} > 4. Rerun attached {{hello-snappy-1.0-SNAPSHOT.jar}} > {code} > bin/flink run hello-snappy-1.0-SNAPSHOT.jar > Starting execution of program > ------------------------------------------------------------ > The program finished with the following exception: > org.apache.flink.client.program.ProgramInvocationException: Job failed. > (JobID: 7d69baca58f33180cb9251449ddcd396) > at > org.apache.flink.client.program.rest.RestClusterClient.submitJob(RestClusterClient.java:268) > at org.apache.flink.client.program.ClusterClient.run(ClusterClient.java:487) > at > org.apache.flink.streaming.api.environment.StreamContextEnvironment.execute(StreamContextEnvironment.java:66) > at com.github.uce.HelloSnappy.main(HelloSnappy.java:18) > 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.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:529) > at > org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:421) > at org.apache.flink.client.program.ClusterClient.run(ClusterClient.java:427) > at > org.apache.flink.client.cli.CliFrontend.executeProgram(CliFrontend.java:813) > at org.apache.flink.client.cli.CliFrontend.runProgram(CliFrontend.java:287) > at org.apache.flink.client.cli.CliFrontend.run(CliFrontend.java:213) > at > org.apache.flink.client.cli.CliFrontend.parseParameters(CliFrontend.java:1050) > at > org.apache.flink.client.cli.CliFrontend.lambda$main$11(CliFrontend.java:1126) > at > org.apache.flink.runtime.security.NoOpSecurityContext.runSecured(NoOpSecurityContext.java:30) > at org.apache.flink.client.cli.CliFrontend.main(CliFrontend.java:1126) > Caused by: org.apache.flink.runtime.client.JobExecutionException: Job > execution failed. > at > org.apache.flink.runtime.jobmaster.JobResult.toJobExecutionResult(JobResult.java:146) > at > org.apache.flink.client.program.rest.RestClusterClient.submitJob(RestClusterClient.java:265) > ... 17 more > Caused by: java.lang.UnsatisfiedLinkError: Native Library > /.../org/xerial/snappy/native/Mac/x86_64/libsnappyjava.jnilib already loaded > in another classloader > at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1907) > at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1861) > at java.lang.Runtime.loadLibrary0(Runtime.java:870) > at java.lang.System.loadLibrary(System.java:1122) > at org.xerial.snappy.SnappyLoader.loadNativeLibrary(SnappyLoader.java:182) > at org.xerial.snappy.SnappyLoader.loadSnappyApi(SnappyLoader.java:154) > at org.xerial.snappy.Snappy.<clinit>(Snappy.java:47) > at com.github.uce.HelloSnappy.lambda$main$95f17bfa$1(HelloSnappy.java:13) > at > org.apache.flink.streaming.api.operators.StreamMap.processElement(StreamMap.java:41) > at > org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:579) > at > org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:554) > at > org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:534) > at > org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:718) > at > org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:696) > at > org.apache.flink.streaming.api.operators.StreamSourceContexts$NonTimestampContext.collect(StreamSourceContexts.java:104) > at > org.apache.flink.streaming.api.functions.source.FromElementsFunction.run(FromElementsFunction.java:164) > at > org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:94) > at > org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:58) > at > org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:99) > at > org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:300) > at org.apache.flink.runtime.taskmanager.Task.run(Task.java:704) > at java.lang.Thread.run(Thread.java:748) > {code} > *Note*: The attached user code configures Snappy to use {{libsnappyjava}} in > the path specified by {{java.library.path}} (see > {{org-xerial-snappy.properties}}). When bundling the native code in the user > JAR, repeated execution works fine. -- This message was sent by Atlassian Jira (v8.3.4#803005)