Question

我为Spark设置了这些配置，但每当我正在阅读或写入Cassandra表时，我都会得到ioException

          .setMaster(sparkIp)
          .set("spark.cassandra.connection.host", cassandraIp)
          .set("spark.sql.crossJoin.enabled", "true")
          .set("spark.executor.memory", sparkExecutorMemory) //**26 GB**
          .set("spark.executor.cores", sparkExecutorCore) // **from 4 to 8**
          .set("spark.executor.instances", sparkExecutorInstances) // 1
          .set("spark.cassandra.output.batch.size.bytes", "2048")
          .set("spark.sql.broadcastTimeout", "2000")
          .set("spark.sql.shuffle.partitions", "1000")
          .set("spark.network.timeout", "80s")
          .set("spark.executor.extraJavaOptions", "-verbose:gc -XX:+UseG1GC")

sc.cassandraTableMyCaseClass //阅读代码

dataRDD..saveToCassandra（“myDatabase”，“mytable”）//编写代码

表格中的数据量很大，操作也很复杂。

我正在使用具有28gb内存和8个内核的火花大师以及具有相同配置的10个火花工作者，其中我使用的是26 gb内存和4到8个内核。有时我也得到ExecutorLostException。

在Cassandra表中编写数据时的最新StackTrace

org.apache.spark.SparkException: Job aborted due to stage failure: Task 145 in stage 6.0 failed 4 times, most recent failure: Lost task 145.6 in stage 6.0 (TID 3268, 10.178.149.48): ExecutorLostFailure (executor 157 exited caused by one of the running tasks) Reason: Executor heartbeat timed out after 118434 ms
Driver stacktrace:
    at org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$failJobAndIndependentStages(DAGScheduler.scala:1450)
    at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1438)
    at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1437)
    at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
    at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
    at org.apache.spark.scheduler.DAGScheduler.abortStage(DAGScheduler.scala:1437)
    at org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:811)
    at org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:811)
    at scala.Option.foreach(Option.scala:257)
    at org.apache.spark.scheduler.DAGScheduler.handleTaskSetFailed(DAGScheduler.scala:811)
    at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.doOnReceive(DAGScheduler.scala:1659)
    at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:1618)
    at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:1607)
    at org.apache.spark.util.EventLoop$$anon$1.run(EventLoop.scala:48)

提前谢谢

通过Spark从Cassandra表读取和写入时获取异常

0 个答案: