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我有一个基本的火花流字数和它只是不工作。火花流不工作
import sys
from pyspark import SparkConf, SparkContext
from pyspark.streaming import StreamingContext
sc = SparkContext(appName='streaming', master="local[*]")
scc = StreamingContext(sc, batchDuration=5)
lines = scc.socketTextStream("localhost", 9998)
words = lines.flatMap(lambda line: line.split())
counts = words.map(lambda word: (word, 1)).reduceByKey(lambda x, y: x + y)
counts.pprint()
print 'Listening'
scc.start()
scc.awaitTermination()
我在另一个终端上运行nc -lk 9998
,我粘贴了一些文本。它打印出典型的日志(没有例外),但它结束了排队作业一些奇怪的时间(45岁),并不断打印此...
15/06/19 18:53:30 INFO SparkContext: Created broadcast 1 from broadcast at DAGScheduler.scala:874
15/06/19 18:53:30 INFO DAGScheduler: Submitting 1 missing tasks from ResultStage 2 (PythonRDD[7] at RDD at PythonRDD.scala:43)
15/06/19 18:53:30 INFO TaskSchedulerImpl: Adding task set 2.0 with 1 tasks
15/06/19 18:53:35 INFO JobScheduler: Added jobs for time 1434754415000 ms
15/06/19 18:53:40 INFO JobScheduler: Added jobs for time 1434754420000 ms
15/06/19 18:53:45 INFO JobScheduler: Added jobs for time 1434754425000 ms
...
...
我在做什么错?
谢谢。我认为'本地[*]'会自动分配基于本地可用内核的执行程序? (说过,它解决了我的问题,但很好奇为什么'*'不起作用) –
从文档中不清楚,但我认为'local [*]'与'local'类似,只创建一个线程对于接收者而言并且执行者没有线程。 –