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我的班级中有一张不可变的地图。当我以本地模式运行我的代码时,没有问题,我可以访问地图中的每个键。但是,当我以集群模式运行我的代码时,节点会在映射中找不到键的错误。在集群模式下使用地图的火花
我到现在为止所尝试的是这些;
- 在集群上广播不可变映射。
broadcast = sc.broadcast(my_immutable_map)
-Parallelize地图作为对RDD
my_map_rdd = sc.parallelize(my_immutable_map.toSeq)
当我检查日志,我看到钥匙未发现异常。 我的错误堆栈跟踪如下:
Driver stacktrace:
org.apache.spark.SparkException: Job aborted due to stage failure: Task 1 in stage 15.0 failed 4 times, most recent failure: Lost task 1.3 in stage 15.0 (TID 25, datanode1.big.com): java.util.NoSuchElementException: key not found: 905053199731
at scala.collection.MapLike$class.default(MapLike.scala:228)
at scala.collection.AbstractMap.default(Map.scala:58)
at scala.collection.MapLike$class.apply(MapLike.scala:141)
at scala.collection.AbstractMap.apply(Map.scala:58)
at havelsan.CDRGenerator$.generate_random_target(CDRGenerator.scala:95)
at havelsan.CDRGenerator$$anonfun$main$2$$anonfun$6.apply(CDRGenerator.scala:167)
at havelsan.CDRGenerator$$anonfun$main$2$$anonfun$6.apply(CDRGenerator.scala:165)
at scala.collection.Iterator$$anon$11.next(Iterator.scala:328)
at scala.collection.Iterator$$anon$14.hasNext(Iterator.scala:389)
at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:327)
at org.apache.spark.rdd.PairRDDFunctions$$anonfun$saveAsHadoopDataset$1$$anonfun$13$$anonfun$apply$6.apply$mcV$sp(PairRDDFunctions.scala:1197)
at org.apache.spark.rdd.PairRDDFunctions$$anonfun$saveAsHadoopDataset$1$$anonfun$13$$anonfun$apply$6.apply(PairRDDFunctions.scala:1197)
at org.apache.spark.rdd.PairRDDFunctions$$anonfun$saveAsHadoopDataset$1$$anonfun$13$$anonfun$apply$6.apply(PairRDDFunctions.scala:1197)
at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1251)
at org.apache.spark.rdd.PairRDDFunctions$$anonfun$saveAsHadoopDataset$1$$anonfun$13.apply(PairRDDFunctions.scala:1205)
at org.apache.spark.rdd.PairRDDFunctions$$anonfun$saveAsHadoopDataset$1$$anonfun$13.apply(PairRDDFunctions.scala:1185)
at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:66)
at org.apache.spark.scheduler.Task.run(Task.scala:89)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:214)
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)
你能解释一下如何分配火花地图以及它是如何可能有些节点无法找到在此映射中的某些键,好吗?顺便说一句,我的火花版本是1.6.0
我错过了什么?
UPDATE
这部分是用于初始化驾驶员地图。
...
var pd = sc.textFile("hdfs://...")
my_immutable_map = pd.map(line => line.split(":")).map{ line => (line(0), line(1).split(","))}.collectAsMap
...
broadcast = sc.broadcast(my_immutable_map)
my_map_rdd = sc.parallelize(my_immutable_map.toSeq)
这是我得到错误的部分。
def my_func(key:String):String={
...
my_value = broadcast.value(key)
...
}
my_func在地图内被调用为;
my_another_rdd.map{ line =>
val key = line.split(",")(0)
my_func(key)
}
spark版本?? – banjara
我的火花版本是1.6.0 –
请提供更多代码。如果地图相当小,第一种方法是正确的。 –