我正在使用Cassandra 2.1.5(dsc),Spark 1.2.1和spark-cassandra-connector 1.2.1。
当我运行Spark作业(scala脚本)时,我收到以下错误:
16/03/08 10:22:03 INFO DAGScheduler:Job 0 failed:reduce at JsonRDD.scala:57,花了15.051150 s线程" main" org.apache.spark.SparkException:作业因阶段失败而中止: 阶段1.0中的任务1失败1次,最近失败:丢失任务 阶段1.0中的1.0(TID 4,localhost):com.esotericsoftware.kryo.KryoException:无法找到类: org.apache.spark.sql.cassandra.CassandraS QLRow
我尝试使用以下内容执行here所述的内容:
/home/ubuntu/spark-1.2.1/bin/spark-submit --driver-class-path /home/ubuntu/.ivy2/cache/com.datastax.spark/spark-cassandra-connector_2.10/jars/spark-cassandra-connector_2.10-1.2.1.jar --conf spark.executor.extraClassPath=/home/ubuntu/.ivy2/cache/com.datastax.spark/spark-cassandra-connector_2.10/jars/spark-cassandra-connector_2.10-1.2.1.jar --class "$class" "$jar"
但只会收到以下错误:
线程中的异常" main" java.lang.NoClassDefFoundError: COM / datastax /驱动器/核心/ ConsistencyLevel 在com.datastax.spark.connector.writer.WriteConf $。(WriteConf.scala:76) 在com.datastax.spark.connector.writer.WriteConf $。(WriteConf.scala) 在com.datastax.spark.connector.util.ConfigCheck $。(ConfigCheck.scala:23) 在com.datastax.spark.connector.util.ConfigCheck $。(ConfigCheck.scala) 在com.datastax.spark.connector.cql.CassandraConnectorConf $ .apply(CassandraConnectorConf.scala:81) 在com.datastax.spark.connector.cql.CassandraConnector $ .apply(CassandraConnector.scala:204) 在com.datastax.spark.connector.RDDFunctions.joinWithCassandraTable $ default $ 5(RDDFunctions.scala:127) 在co.crowdx.aggregation.SignalIO $ .main(SignalIO.scala:92) 在co.crowdx.aggregation.SignalIO.main(SignalIO.scala) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) 在org.apache.spark.deploy.SparkSubmit $ .launch(SparkSubmit.scala:358) 在org.apache.spark.deploy.SparkSubmit $ .main(SparkSubmit.scala:75) 在org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
引起:java.lang.ClassNotFoundException: com.datastax.driver.core.ConsistencyLevel
可能是什么问题? (我现在不想升级spark或cassandra)
修改的
我尝试运行spark shell以更简单的方式查看问题:
spark-1.2.1/bin/spark-shell --jars /home/ubuntu/.ivy2/cache/com.datastax.spark/spark-cassandra connector_2.10/jars/spark-cassandra-connector_2.10-1.2.1.jar --conf spark.cassandra.connection.host=11.11.11.11
尝试运行简单的命令:
> scala> import org.apache.spark.sql.cassandra.CassandraSQLContext
> import org.apache.spark.sql.cassandra.CassandraSQLContext
>
> scala> import org.apache.spark.sql.SchemaRDD import
> org.apache.spark.sql.SchemaRDD
>
> scala> val cc = new CassandraSQLContext(sc) cc:
> org.apache.spark.sql.cassandra.CassandraSQLContext =
> org.apache.spark.sql.cassandra.CassandraSQLContext@1c41c05e
>
> scala> val rdd = cc.sql("select * from listener.scans_daily_imei_partitioned as a, listener.scans_daily_imei_partitioned as b where a.id=b.id")
我收到以下错误:
rdd:org.apache.spark.sql.SchemaRDD = RDD at ScheDRDD [0] SchemaRDD.scala:108 ==查询计划== ==物理计划== com.google.common.util.concurrent.ExecutionError:java.lang.NoClassDefFoundError: COM / datastax /驱动器/芯/ ConsistencyLevel
答案 0 :(得分:3)
我用自编译的spark-cassandra-connector解决了这个问题:
wget https://github.com/datastax/spark-cassandra-connector/archive/v1.2.1.zip
unzip v1.2.1.zip
cd spark-cassandra-connector-1.2.1
sbt assembly
cp /home/ubuntu/spark-cassandra-connector-1.2.1/spark-cassandra-connector-java/target/scala-2.10/spark-cassandra-connector-java-assembly-1.2.1.jar spark-cassandra-connector-java-assembly-1.2.1-FAT.jar
将火花用作:
/home/ubuntu/spark-1.2.1/bin/spark-submit --driver-class-path /home/ubuntu/spark-cassandra-connector-java-assembly-1.2.1-FAT.jar --conf spark.executor.extraClassPath=/home/ubuntu/spark-cassandra-connector-java-assembly-1.2.1-FAT.jar --class "$class" "$jar"
完美无缺。