我在emr齐柏林飞艇上运行几个笔记本。
EMR version 5.29.0 Spark 2.4.4 and Zeppelin 0.8.2 有时，由于多个笔记本并行运行，因此内存不足，无法运行笔记本。因此，它将抛出如下错误。

INFO [2021-03-30 06:14:51,383] ({pool-2-thread-99} Paragraph.java[jobRun]:381) - Run paragraph [paragraph_id: 20210325-112126_1343087125, interpreter: pyspark, note_id: 2G34X6W7Z, user: admin]
ERROR [2021-03-30 06:14:51,385] ({pool-2-thread-99} Job.java[run]:190) - Job failed
java.lang.RuntimeException: java.lang.NullPointerException
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreterProcess.callRemoteFunction(RemoteInterpreterProcess.java:141)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreter.internal_create(RemoteInterpreter.java:169)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreter.open(RemoteInterpreter.java:136)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreter.getFormType(RemoteInterpreter.java:312)
    at org.apache.zeppelin.notebook.Paragraph.jobRun(Paragraph.java:408)
    at org.apache.zeppelin.scheduler.Job.run(Job.java:188)
    at org.apache.zeppelin.scheduler.RemoteScheduler$JobRunner.run(RemoteScheduler.java:315)
    at java.util.concurrent.Executors$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:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
    at org.apache.thrift.transport.TSocket.open(TSocket.java:170)
    at org.apache.zeppelin.interpreter.remote.ClientFactory.create(ClientFactory.java:51)
    at org.apache.zeppelin.interpreter.remote.ClientFactory.create(ClientFactory.java:37)
    at org.apache.commons.pool2.BasePooledObjectFactory.makeObject(BasePooledObjectFactory.java:60)
    at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:861)
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:435)
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreterProcess.getClient(RemoteInterpreterProcess.java:62)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreterProcess.callRemoteFunction(RemoteInterpreterProcess.java:133)
    ... 13 more
ERROR [2021-03-30 06:14:51,385] ({pool-2-thread-99} NotebookServer.java[afterStatusChange]:2308) - Error
java.lang.RuntimeException: java.lang.NullPointerException
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreterProcess.callRemoteFunction(RemoteInterpreterProcess.java:141)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreter.internal_create(RemoteInterpreter.java:169)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreter.open(RemoteInterpreter.java:136)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreter.getFormType(RemoteInterpreter.java:312)
    at org.apache.zeppelin.notebook.Paragraph.jobRun(Paragraph.java:408)
    at org.apache.zeppelin.scheduler.Job.run(Job.java:188)
    at org.apache.zeppelin.scheduler.RemoteScheduler$JobRunner.run(RemoteScheduler.java:315)
    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:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
    at org.apache.thrift.transport.TSocket.open(TSocket.java:170)
    at org.apache.zeppelin.interpreter.remote.ClientFactory.create(ClientFactory.java:51)
    at org.apache.zeppelin.interpreter.remote.ClientFactory.create(ClientFactory.java:37)
    at org.apache.commons.pool2.BasePooledObjectFactory.makeObject(BasePooledObjectFactory.java:60)
    at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:861)
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:435)
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreterProcess.getClient(RemoteInterpreterProcess.java:62)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreterProcess.callRemoteFunction(RemoteInterpreterProcess.java:133)
    ... 13 more
 WARN [2021-03-30 06:14:51,386] ({pool-2-thread-99} NotebookServer.java[afterStatusChange]:2316) - Job 20210325-112126_1343087125 is finished, status: ERROR, exception: java.lang.RuntimeException: java.lang.NullPointerException, result: %text java.lang.NullPointerException
    at org.apache.thrift.transport.TSocket.open(TSocket.java:170)
    at org.apache.zeppelin.interpreter.remote.ClientFactory.create(ClientFactory.java:51)
    at org.apache.zeppelin.interpreter.remote.ClientFactory.create(ClientFactory.java:37)
    at org.apache.commons.pool2.BasePooledObjectFactory.makeObject(BasePooledObjectFactory.java:60)
    at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:861)
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:435)
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreterProcess.getClient(RemoteInterpreterProcess.java:62)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreterProcess.callRemoteFunction(RemoteInterpreterProcess.java:133)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreter.internal_create(RemoteInterpreter.java:169)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreter.open(RemoteInterpreter.java:136)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreter.getFormType(RemoteInterpreter.java:312)
    at org.apache.zeppelin.notebook.Paragraph.jobRun(Paragraph.java:408)
    at org.apache.zeppelin.scheduler.Job.run(Job.java:188)
    at org.apache.zeppelin.scheduler.RemoteScheduler$JobRunner.run(RemoteScheduler.java:315)
    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:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

 INFO [2021-03-30 06:14:51,401] ({pool-2-thread-99} VFSNotebookRepo.java[save]:196) - Saving note:2G34X6W7Z
 INFO [2021-03-30 06:14:51,775] ({pool-2-thread-99} SchedulerFactory.java[jobFinished]:120) - Job 20210325-112126_1343087125 finished by scheduler org.apache.zeppelin.interpreter.remote.RemoteInterpreter-iwb::2G34X6W7Z-shared_session

一旦出现此问题，即使内存在稍后阶段可用，笔记本也不会运行，直到齐柏林飞艇服务重新启动。我们尝试在整个Yarn资源空闲时运行笔记本，但笔记本抛出相同的错误。问题一直存在，直到解释器/齐柏林飞艇重新启动。在此之前，我们不能运行同一个笔记本。