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Posted to users@zeppelin.apache.org by Grant Bentley <gr...@AlphaMindSolutions.com> on 2019/10/01 08:29:19 UTC

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From: James Srinivasan <ja...@gmail.com>
Sent: 01 October 2019 09:26
To: users@zeppelin.apache.org
Subject: Re: thrift.transport.TTransportException

I'm guessing you might have conflicting versions of libthrift on your classpath

On Tue, 1 Oct 2019, 08:44 Jeff Zhang, <zj...@gmail.com>> wrote:
It looks like you are using pyspark, could you try just start scala spark interpreter via `%spark` ? First let's figure out whether it is related with pyspark.



Manuel Sopena Ballesteros <ma...@garvan.org.au>> 于2019年10月1日周二 下午3:29写道:
Dear Zeppelin community,

I would like to ask for advice in regards an error I am having with thrift.

I am getting quite a lot of these errors while running my notebooks

org.apache.thrift.transport.TTransportException at org.apache.thrift.transport.TIOStreamTransport.read(TIOStreamTransport.java:132) at org.apache.thrift.transport.TTransport.readAll(TTransport.java:86) at org.apache.thrift.protocol.TBinaryProtocol.readAll(TBinaryProtocol.java:429) at org.apache.thrift.protocol.TBinaryProtocol.readI32(TBinaryProtocol.java:318) at org.apache.thrift.protocol.TBinaryProtocol.readMessageBegin(TBinaryProtocol.java:219) at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:77) at org.apache.zeppelin.interpreter.thrift.RemoteInterpreterService$Client.recv_interpret(RemoteInterpreterService.java:274) at org.apache.zeppelin.interpreter.thrift.RemoteInterpreterService$Client.interpret(RemoteInterpreterService.java:258) at org.apache.zeppelin.interpreter.remote.RemoteInterpreter$4.call(RemoteInterpreter.java:233) at org.apache.zeppelin.interpreter.remote.RemoteInterpreter$4.call(RemoteInterpreter.java:229) at org.apache.zeppelin.interpreter.remote.RemoteInterpreterProcess.callRemoteFunction(RemoteInterpreterProcess.java:135) at org.apache.zeppelin.interpreter.remote.RemoteInterpreter.interpret(RemoteInterpreter.java:228) at org.apache.zeppelin.notebook.Paragraph.jobRun(Paragraph.java:437) at org.apache.zeppelin.scheduler.Job.run(Job.java:188) at org.apache.zeppelin.scheduler.RemoteScheduler$JobRunner.run(RemoteScheduler.java:307) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)

And this is the Spark driver application logs:
…
===============================================================================
YARN executor launch context:
  env:
    CLASSPATH -> {{PWD}}<CPS>{{PWD}}/__spark_conf__<CPS>{{PWD}}/__spark_libs__/*<CPS>$HADOOP_CONF_DIR<CPS>/usr/hdp/3.1.0.0-78/hadoop/*<CPS>/usr/hdp/3.1.0.0-78/hadoop/lib/*<CPS>/usr/hdp/current/hadoop-hdfs-client/*<CPS>/usr/hdp/current/hadoop-hdfs-client/lib/*<CPS>/usr/hdp/current/hadoop-yarn-client/*<CPS>/usr/hdp/current/hadoop-yarn-client/lib/*<CPS>$PWD/mr-framework/hadoop/share/hadoop/mapreduce/*:$PWD/mr-framework/hadoop/share/hadoop/mapreduce/lib/*:$PWD/mr-framework/hadoop/share/hadoop/common/*:$PWD/mr-framework/hadoop/share/hadoop/common/lib/*:$PWD/mr-framework/hadoop/share/hadoop/yarn/*:$PWD/mr-framework/hadoop/share/hadoop/yarn/lib/*:$PWD/mr-framework/hadoop/share/hadoop/hdfs/*:$PWD/mr-framework/hadoop/share/hadoop/hdfs/lib/*:$PWD/mr-framework/hadoop/share/hadoop/tools/lib/*:/usr/hdp/3.1.0.0-78/hadoop/lib/hadoop-lzo-0.6.0.3.1.0.0-78.jar:/etc/hadoop/conf/secure<CPS>{{PWD}}/__spark_conf__/__hadoop_conf__
    SPARK_YARN_STAGING_DIR -> hdfs://gl-hdp-ctrl01-mlx.mlx:8020/user/mansop/.sparkStaging/application_1568954689585_0052
    SPARK_USER -> mansop
    PYTHONPATH -> /usr/hdp/current/spark2-client/python/lib/py4j-0.10.7-src.zip:/usr/hdp/current/spark2-client/python/:<CPS>{{PWD}}/pyspark.zip<CPS>{{PWD}}/py4j-0.10.7-src.zip

  command:
    LD_LIBRARY_PATH="/usr/hdp/current/hadoop-client/lib/native:/usr/hdp/current/hadoop-client/lib/native/Linux-amd64-64:$LD_LIBRARY_PATH" \
      {{JAVA_HOME}}/bin/java \
      -server \
      -Xmx1024m \
      '-XX:+UseNUMA' \
      -Djava.io.tmpdir={{PWD}}/tmp \
      '-Dspark.history.ui.port=18081' \
      -Dspark.yarn.app.container.log.dir=<LOG_DIR> \
      -XX:OnOutOfMemoryError='kill %p' \
      org.apache.spark.executor.CoarseGrainedExecutorBackend \
      --driver-url \
      spark://CoarseGrainedScheduler@r640-1-12-mlx.mlx:35602 \
      --executor-id \
      <executorId> \
      --hostname \
      <hostname> \
      --cores \
      1 \
      --app-id \
      application_1568954689585_0052 \
      --user-class-path \
      file:$PWD/__app__.jar \
      1><LOG_DIR>/stdout \
      2><LOG_DIR>/stderr

  resources:
    __app__.jar -> resource { scheme: "hdfs" host: "gl-hdp-ctrl01-mlx.mlx" port: 8020 file: "/user/mansop/.sparkStaging/application_1568954689585_0052/spark-interpreter-0.8.0.3.1.0.0-78.jar" } size: 20433040 timestamp: 1569804142906 type: FILE visibility: PRIVATE
    __spark_conf__ -> resource { scheme: "hdfs" host: "gl-hdp-ctrl01-mlx.mlx" port: 8020 file: "/user/mansop/.sparkStaging/application_1568954689585_0052/__spark_conf__.zip" } size: 277725 timestamp: 1569804143239 type: ARCHIVE visibility: PRIVATE
    sparkr -> resource { scheme: "hdfs" host: "gl-hdp-ctrl01-mlx.mlx" port: 8020 file: "/user/mansop/.sparkStaging/application_1568954689585_0052/sparkr.zip" } size: 688255 timestamp: 1569804142991 type: ARCHIVE visibility: PRIVATE
    log4j_yarn_cluster.properties -> resource { scheme: "hdfs" host: "gl-hdp-ctrl01-mlx.mlx" port: 8020 file: "/user/mansop/.sparkStaging/application_1568954689585_0052/log4j_yarn_cluster.properties" } size: 1018 timestamp: 1569804142955 type: FILE visibility: PRIVATE
    pyspark.zip -> resource { scheme: "hdfs" host: "gl-hdp-ctrl01-mlx.mlx" port: 8020 file: "/user/mansop/.sparkStaging/application_1568954689585_0052/pyspark.zip" } size: 550570 timestamp: 1569804143018 type: FILE visibility: PRIVATE
    __spark_libs__ -> resource { scheme: "hdfs" host: "gl-hdp-ctrl01-mlx.mlx" port: 8020 file: "/hdp/apps/3.1.0.0-78/spark2/spark2-hdp-yarn-archive.tar.gz" } size: 280293050 timestamp: 1568938921259 type: ARCHIVE visibility: PUBLIC
    py4j-0.10.7-src.zip -> resource { scheme: "hdfs" host: "gl-hdp-ctrl01-mlx.mlx" port: 8020 file: "/user/mansop/.sparkStaging/application_1568954689585_0052/py4j-0.10.7-src.zip" } size: 42437 timestamp: 1569804143043 type: FILE visibility: PRIVATE
    __hive_libs__ -> resource { scheme: "hdfs" host: "gl-hdp-ctrl01-mlx.mlx" port: 8020 file: "/hdp/apps/3.1.0.0-78/spark2/spark2-hdp-hive-archive.tar.gz" } size: 43807162 timestamp: 1568938925069 type: ARCHIVE visibility: PUBLIC

===============================================================================
INFO [2019-09-30 10:42:37,303] ({main} RMProxy.java[newProxyInstance]:133) - Connecting to ResourceManager at gl-hdp-ctrl03-mlx.mlx/10.0.1.248:8030<http://10.0.1.248:8030>
INFO [2019-09-30 10:42:37,324] ({main} Logging.scala[logInfo]:54) - Registering the ApplicationMaster
INFO [2019-09-30 10:42:37,454] ({main} Configuration.java[getConfResourceAsInputStream]:2756) - found resource resource-types.xml at file:/etc/hadoop/3.1.0.0-78/0/resource-types.xml
INFO [2019-09-30 10:42:37,470] ({main} Logging.scala[logInfo]:54) - Will request 2 executor container(s), each with 1 core(s) and 1408 MB memory (including 384 MB of overhead)
INFO [2019-09-30 10:42:37,474] ({dispatcher-event-loop-14} Logging.scala[logInfo]:54) - ApplicationMaster registered as NettyRpcEndpointRef(spark://YarnAM@r640-1-12-mlx.mlx:35602)
INFO [2019-09-30 10:42:37,485] ({main} Logging.scala[logInfo]:54) - Submitted 2 unlocalized container requests.
INFO [2019-09-30 10:42:37,518] ({main} Logging.scala[logInfo]:54) - Started progress reporter thread with (heartbeat : 3000, initial allocation : 200) intervals
INFO [2019-09-30 10:42:37,619] ({Reporter} Logging.scala[logInfo]:54) - Launching container container_e01_1568954689585_0052_01_000002 on host r640-1-12-mlx.mlx for executor with ID 1
INFO [2019-09-30 10:42:37,621] ({Reporter} Logging.scala[logInfo]:54) - Launching container container_e01_1568954689585_0052_01_000003 on host r640-1-13-mlx.mlx for executor with ID 2
INFO [2019-09-30 10:42:37,623] ({Reporter} Logging.scala[logInfo]:54) - Received 2 containers from YARN, launching executors on 2 of them.
INFO [2019-09-30 10:42:39,481] ({dispatcher-event-loop-51} Logging.scala[logInfo]:54) - Registered executor NettyRpcEndpointRef(spark-client://Executor) (10.0.1.12:54340<http://10.0.1.12:54340>) with ID 1
INFO [2019-09-30 10:42:39,553] ({dispatcher-event-loop-62} Logging.scala[logInfo]:54) - Registering block manager r640-1-12-mlx.mlx:33043 with 408.9 MB RAM, BlockManagerId(1, r640-1-12-mlx.mlx, 33043, None)
INFO [2019-09-30 10:42:40,003] ({dispatcher-event-loop-9} Logging.scala[logInfo]:54) - Registered executor NettyRpcEndpointRef(spark-client://Executor) (10.0.1.13:33812<http://10.0.1.13:33812>) with ID 2
INFO [2019-09-30 10:42:40,023] ({pool-6-thread-2} Logging.scala[logInfo]:54) - SchedulerBackend is ready for scheduling beginning after reached minRegisteredResourcesRatio: 0.8
INFO [2019-09-30 10:42:40,025] ({pool-6-thread-2} Logging.scala[logInfo]:54) - YarnClusterScheduler.postStartHook done
INFO [2019-09-30 10:42:40,072] ({dispatcher-event-loop-11} Logging.scala[logInfo]:54) - Registering block manager r640-1-13-mlx.mlx:34105 with 408.9 MB RAM, BlockManagerId(2, r640-1-13-mlx.mlx, 34105, None)
INFO [2019-09-30 10:42:41,779] ({pool-6-thread-2} SparkShims.java[loadShims]:54) - Initializing shims for Spark 2.x
INFO [2019-09-30 10:42:41,840] ({pool-6-thread-2} Py4JUtils.java[createGatewayServer]:44) - Launching GatewayServer at 127.0.0.1:36897<http://127.0.0.1:36897>
INFO [2019-09-30 10:42:41,852] ({pool-6-thread-2} PySparkInterpreter.java[createGatewayServerAndStartScript]:265) - pythonExec: /home/mansop/anaconda2/bin/python
INFO [2019-09-30 10:42:41,862] ({pool-6-thread-2} PySparkInterpreter.java[setupPySparkEnv]:236) - PYTHONPATH: /usr/hdp/current/spark2-client/python/lib/py4j-0.10.7-src.zip:/usr/hdp/current/spark2-client/python/::/d1/hadoop/yarn/local/usercache/mansop/appcache/application_1568954689585_0052/container_e01_1568954689585_0052_01_000001/pyspark.zip:/d1/hadoop/yarn/local/usercache/mansop/appcache/application_1568954689585_0052/container_e01_1568954689585_0052_01_000001/py4j-0.10.7-src.zip
ERROR [2019-09-30 10:43:09,061] ({SIGTERM handler} SignalUtils.scala[apply$mcZ$sp]:43) - RECEIVED SIGNAL TERM
INFO [2019-09-30 10:43:09,068] ({shutdown-hook-0} Logging.scala[logInfo]:54) - Invoking stop() from shutdown hook
INFO [2019-09-30 10:43:09,082] ({shutdown-hook-0} AbstractConnector.java[doStop]:318) - Stopped Spark@505439b3{HTTP/1.1,[http/1.1]}{0.0.0.0:0<http://0.0.0.0:0>}
INFO [2019-09-30 10:43:09,085] ({shutdown-hook-0} Logging.scala[logInfo]:54) - Stopped Spark web UI at http://r640-1-12-mlx.mlx:42446
INFO [2019-09-30 10:43:09,140] ({dispatcher-event-loop-52} Logging.scala[logInfo]:54) - Driver requested a total number of 0 executor(s).
INFO [2019-09-30 10:43:09,142] ({shutdown-hook-0} Logging.scala[logInfo]:54) - Shutting down all executors
INFO [2019-09-30 10:43:09,144] ({dispatcher-event-loop-51} Logging.scala[logInfo]:54) - Asking each executor to shut down
INFO [2019-09-30 10:43:09,151] ({shutdown-hook-0} Logging.scala[logInfo]:54) - Stopping SchedulerExtensionServices
(serviceOption=None,
services=List(),
started=false)
ERROR [2019-09-30 10:43:09,155] ({Reporter} Logging.scala[logError]:91) - Exception from Reporter thread.
org.apache.hadoop.yarn.exceptions.ApplicationAttemptNotFoundException: Application attempt appattempt_1568954689585_0052_000001 doesn't exist in ApplicationMasterService cache.
               at org.apache.hadoop.yarn.server.resourcemanager.ApplicationMasterService.allocate(ApplicationMasterService.java:404)
               at org.apache.hadoop.yarn.api.impl.pb.service.ApplicationMasterProtocolPBServiceImpl.allocate(ApplicationMasterProtocolPBServiceImpl.java:60)
               at org.apache.hadoop.yarn.proto.ApplicationMasterProtocol$ApplicationMasterProtocolService$2.callBlockingMethod(ApplicationMasterProtocol.java:99)
               at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:524)
               at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1025)
               at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:876)
               at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:822)
               at java.security.AccessController.doPrivileged(Native Method)
               at javax.security.auth.Subject.doAs(Subject.java:422)
               at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1730)
               at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2682)

               at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
               at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
               at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
               at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
               at org.apache.hadoop.yarn.ipc.RPCUtil.instantiateException(RPCUtil.java:53)
               at org.apache.hadoop.yarn.ipc.RPCUtil.instantiateYarnException(RPCUtil.java:75)
               at org.apache.hadoop.yarn.ipc.RPCUtil.unwrapAndThrowException(RPCUtil.java:116)
               at org.apache.hadoop.yarn.api.impl.pb.client.ApplicationMasterProtocolPBClientImpl.allocate(ApplicationMasterProtocolPBClientImpl.java:79)
               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.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:422)
               at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:165)
               at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:157)
               at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95)
               at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:359)
               at com.sun.proxy.$Proxy21.allocate(Unknown Source)
               at org.apache.hadoop.yarn.client.api.impl.AMRMClientImpl.allocate(AMRMClientImpl.java:320)
               at org.apache.spark.deploy.yarn.YarnAllocator.allocateResources(YarnAllocator.scala:268)
               at org.apache.spark.deploy.yarn.ApplicationMaster$$anon$3.run(ApplicationMaster.scala:556)
Caused by: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.yarn.exceptions.ApplicationAttemptNotFoundException): Application attempt appattempt_1568954689585_0052_000001 doesn't exist in ApplicationMasterService cache.
               at org.apache.hadoop.yarn.server.resourcemanager.ApplicationMasterService.allocate(ApplicationMasterService.java:404)
               at org.apache.hadoop.yarn.api.impl.pb.service.ApplicationMasterProtocolPBServiceImpl.allocate(ApplicationMasterProtocolPBServiceImpl.java:60)
               at org.apache.hadoop.yarn.proto.ApplicationMasterProtocol$ApplicationMasterProtocolService$2.callBlockingMethod(ApplicationMasterProtocol.java:99)
               at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:524)
               at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1025)
               at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:876)
               at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:822)
               at java.security.AccessController.doPrivileged(Native Method)
               at javax.security.auth.Subject.doAs(Subject.java:422)
               at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1730)
               at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2682)

               at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1497)
               at org.apache.hadoop.ipc.Client.call(Client.java:1443)
               at org.apache.hadoop.ipc.Client.call(Client.java:1353)
               at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:228)
               at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)
               at com.sun.proxy.$Proxy20.allocate(Unknown Source)
               at org.apache.hadoop.yarn.api.impl.pb.client.ApplicationMasterProtocolPBClientImpl.allocate(ApplicationMasterProtocolPBClientImpl.java:77)
               ... 13 more
INFO [2019-09-30 10:43:09,164] ({Reporter} Logging.scala[logInfo]:54) - Final app status: FAILED, exitCode: 12, (reason: Application attempt appattempt_1568954689585_0052_000001 doesn't exist in ApplicationMasterService cache.
               at org.apache.hadoop.yarn.server.resourcemanager.ApplicationMasterService.allocate(ApplicationMasterService.java:404)
               at org.apache.hadoop.yarn.api.impl.pb.service.ApplicationMasterProtocolPBServiceImpl.allocate(ApplicationMasterProtocolPBServiceImpl.java:60)
               at org.apache.hadoop.yarn.proto.ApplicationMasterProtocol$ApplicationMasterProtocolService$2.callBlockingMethod(ApplicationMasterProtocol.java:99)
               at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:524)
               at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1025)
               at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:876)
               at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:822)
               at java.security.AccessController.doPrivileged(Native Method)
               at javax.security.auth.Subject.doAs(Subject.java:422)
               at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1730)
               at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2682)
)
INFO [2019-09-30 10:43:09,166] ({dispatcher-event-loop-54} Logging.scala[logInfo]:54) - MapOutputTrackerMasterEndpoint stopped!
INFO [2019-09-30 10:43:09,236] ({shutdown-hook-0} Logging.scala[logInfo]:54) - MemoryStore cleared
INFO [2019-09-30 10:43:09,237] ({shutdown-hook-0} Logging.scala[logInfo]:54) - BlockManager stopped
INFO [2019-09-30 10:43:09,237] ({shutdown-hook-0} Logging.scala[logInfo]:54) - BlockManagerMaster stopped
INFO [2019-09-30 10:43:09,241] ({dispatcher-event-loop-73} Logging.scala[logInfo]:54) - OutputCommitCoordinator stopped!
INFO [2019-09-30 10:43:09,252] ({shutdown-hook-0} Logging.scala[logInfo]:54) - Successfully stopped SparkContext
INFO [2019-09-30 10:43:09,253] ({shutdown-hook-0} Logging.scala[logInfo]:54) - Shutdown hook called
INFO [2019-09-30 10:43:09,254] ({shutdown-hook-0} Logging.scala[logInfo]:54) - Deleting directory /d1/hadoop/yarn/local/usercache/mansop/appcache/application_1568954689585_0052/spark-ba80cda3-812a-4cf0-b1f6-6e9eb52952b2
INFO [2019-09-30 10:43:09,254] ({shutdown-hook-0} Logging.scala[logInfo]:54) - Deleting directory /d0/hadoop/yarn/local/usercache/mansop/appcache/application_1568954689585_0052/spark-43078781-8f1c-4cd6-a8da-e81b32892cf8
INFO [2019-09-30 10:43:09,255] ({shutdown-hook-0} Logging.scala[logInfo]:54) - Deleting directory /d0/hadoop/yarn/local/usercache/mansop/appcache/application_1568954689585_0052/spark-43078781-8f1c-4cd6-a8da-e81b32892cf8/pyspark-9138f7ad-3f15-42c6-9bf3-e3e72d5d4086

How can I continue troubleshooting in order to find out what this error means?

Thank you very much

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--
Best Regards

Jeff Zhang

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