通过Maven添加Spark依赖项后，启动SparkInterpreter时，Zeppelin引发java.lang.NullPointerException。

时间：2018-08-10 13:38:57

标签： apache-zeppelin google-cloud-dataproc

我试图通过在Zeppelin解释器控制台的groupId:artifactId:version部分中指定Dependencies来通过Maven添加Spark依赖项。一旦我保存并执行了spark段落。抛出java.lang.NullPointerException，完整日志如下

java.lang.NullPointerException
at org.apache.zeppelin.spark.Utils.invokeMethod(Utils.java:44)
at org.apache.zeppelin.spark.Utils.invokeMethod(Utils.java:39)
at org.apache.zeppelin.spark.OldSparkInterpreter.createSparkContext_2(OldSparkInterpreter.java:375)
at org.apache.zeppelin.spark.OldSparkInterpreter.createSparkContext(OldSparkInterpreter.java:364)
at org.apache.zeppelin.spark.OldSparkInterpreter.getSparkContext(OldSparkInterpreter.java:172)
at org.apache.zeppelin.spark.OldSparkInterpreter.open(OldSparkInterpreter.java:740)
at org.apache.zeppelin.spark.SparkInterpreter.open(SparkInterpreter.java:61)
at org.apache.zeppelin.interpreter.LazyOpenInterpreter.open(LazyOpenInterpreter.java:69)
at org.apache.zeppelin.spark.SparkSqlInterpreter.getSparkInterpreter(SparkSqlInterpreter.java:76)
at org.apache.zeppelin.spark.SparkSqlInterpreter.interpret(SparkSqlInterpreter.java:92)
at org.apache.zeppelin.interpreter.LazyOpenInterpreter.interpret(LazyOpenInterpreter.java:103)
at org.apache.zeppelin.interpreter.remote.RemoteInterpreterServer$InterpretJob.jobRun(RemoteInterpreterServer.java:633)
at org.apache.zeppelin.scheduler.Job.run(Job.java:188)
at org.apache.zeppelin.scheduler.FIFOScheduler$1.run(FIFOScheduler.java:140)
at java.util.concurrent.Executors$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)

然后我删除了那个Maven依赖项，但异常并没有消失。

根据日志，Zeppelin似乎无法启动Spark解释器，因此我在zeppelin-interpreter-spark-zeppelin-development-cluster-m.log上查看了Spark Interpreter日志，但运行时未记录任何内容火花段。以下是在Zeppelin-zeppelin-development-cluster-m.log中找到的Zeppelin日志

INFO [2018-08-10 13:24:53,036] ({qtp2110245805-15} VFSNotebookRepo.java[save]:196) - Saving note:2DM9MXZGM
INFO [2018-08-10 13:24:53,053] ({pool-2-thread-2} SchedulerFactory.java[jobStarted]:109) - Job 20180810-111509_373986425 started by scheduler org.apache.zeppelin.interpreter.remote.RemoteInterpreter-spark:shared_process-2DM9MXZGM
INFO [2018-08-10 13:24:53,054] ({pool-2-thread-2} Paragraph.java[jobRun]:380) - Run paragraph [paragraph_id: 20180810-111509_373986425, interpreter: sql, note_id: 2DM9MXZGM, user: anonymous]
WARN [2018-08-10 13:24:58,614] ({pool-2-thread-2} NotebookServer.java[afterStatusChange]:2303) - Job 20180810-111509_373986425 is finished, status: ERROR, exception: null, result: %text java.lang.NullPointerException
at org.apache.zeppelin.spark.Utils.invokeMethod(Utils.java:44)
at org.apache.zeppelin.spark.Utils.invokeMethod(Utils.java:39)
at org.apache.zeppelin.spark.OldSparkInterpreter.createSparkContext_2(OldSparkInterpreter.java:375)
at org.apache.zeppelin.spark.OldSparkInterpreter.createSparkContext(OldSparkInterpreter.java:364)
at org.apache.zeppelin.spark.OldSparkInterpreter.getSparkContext(OldSparkInterpreter.java:172)
at org.apache.zeppelin.spark.OldSparkInterpreter.open(OldSparkInterpreter.java:740)
at org.apache.zeppelin.spark.SparkInterpreter.open(SparkInterpreter.java:61)
at org.apache.zeppelin.interpreter.LazyOpenInterpreter.open(LazyOpenInterpreter.java:69)
at org.apache.zeppelin.spark.SparkSqlInterpreter.getSparkInterpreter(SparkSqlInterpreter.java:76)
at org.apache.zeppelin.spark.SparkSqlInterpreter.interpret(SparkSqlInterpreter.java:92)
at org.apache.zeppelin.interpreter.LazyOpenInterpreter.interpret(LazyOpenInterpreter.java:103)
at org.apache.zeppelin.interpreter.remote.RemoteInterpreterServer$InterpretJob.jobRun(RemoteInterpreterServer.java:633)
at org.apache.zeppelin.scheduler.Job.run(Job.java:188)
at org.apache.zeppelin.scheduler.FIFOScheduler$1.run(FIFOScheduler.java:140)
at java.util.concurrent.Executors$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)

我发现类似的帖子也面临相同的问题，但它们与齐柏林飞艇无法连接到Hive有关。我不认为这是我的问题。我还运行了spark-shell，它运行良好。

我使用的是Google Dataproc图片1.3.1版。

谢谢

1 个答案:

答案 0 :(得分：1)

我已经设法解决了。问题是我添加了以下工件https://mvnrepository.com/artifact/spotify/spark-bigquery/0.2.2-s_2.11作为外部依赖关系，它可能与Spark或Zeppelin库冲突。在删除zeppelin.dep.localrepo中的所有内容（在我的情况下为/usr/lib/zeppelin/local-repo并重新启动Zeppelin之后，一切恢复正常。

谢谢

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