thanks a lot Terry 2016-07-26 12:03 GMT+08:00 Terry Hoo <hujie.ea...@gmail.com>:
> Kevin, > > Try to create the StreamingContext as following: > > val ssc = new StreamingContext(spark.sparkContext, Seconds(2)) > > > > On Tue, Jul 26, 2016 at 11:25 AM, kevin <kiss.kevin...@gmail.com> wrote: > >> hi,all: >> I want to read data from kafka and regist as a table then join a jdbc >> table. >> My sample like this : >> >> val spark = SparkSession >> .builder >> .config(sparkConf) >> .getOrCreate() >> >> val jdbcDF = spark.read.format("jdbc").options(Map("url" -> >> "jdbc:mysql://master1:3306/demo", "driver" -> "com.mysql.jdbc.Driver", >> "dbtable" -> "i_user", "user" -> "root", "password" -> "passok")).load() >> jdbcDF.cache().createOrReplaceTempView("black_book") >> val df = spark.sql("select * from black_book") >> df.show() >> >> val ssc = new StreamingContext(sparkConf, Seconds(2)) >> ssc.checkpoint("checkpoint") >> >> val topicMap = topics.split(",").map((_, numThreads.toInt)).toMap >> val lines = KafkaUtils.createStream(ssc, zkQuorum, group, >> topicMap).map(_._2) >> val words = lines.flatMap(_.split(" ")) >> >> *I got error :* >> >> 16/07/26 11:18:07 WARN AbstractHandler: No Server set for >> org.spark_project.jetty.server.handler.ErrorHandler@6f0ca692 >> +--------------------+--------+--------+ >> | id|username|password| >> +--------------------+--------+--------+ >> |e6faca36-8766-4dc...| a| a| >> |699285a3-a108-457...| admin| 123| >> |e734752d-ac98-483...| test| test| >> |c0245226-128d-487...| test2| test2| >> |4f1bbdb2-89d1-4cc...| 119| 911| >> |16a9a360-13ee-4b5...| 1215| 1215| >> |bf7d6a0d-2949-4c3...| demo3| demo3| >> |de30747c-c466-404...| why| why| >> |644741c9-8fd7-4a5...| scala| p| >> |cda1e44d-af4b-461...| 123| 231| >> |6e409ed9-c09b-4e7...| 798| 23| >> +--------------------+--------+--------+ >> >> Exception in thread "main" org.apache.spark.SparkException: Only one >> SparkContext may be running in this JVM (see SPARK-2243). To ignore this >> error, set spark.driver.allowMultipleContexts = true. The currently running >> SparkContext was created at: >> >> org.apache.spark.sql.SparkSession$Builder.getOrCreate(SparkSession.scala:749) >> main.POC$.main(POC.scala:43) >> main.POC.main(POC.scala) >> sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) >> >> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) >> >> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) >> java.lang.reflect.Method.invoke(Method.java:498) >> >> org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:724) >> org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:180) >> org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:205) >> org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:119) >> org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala) >> at >> org.apache.spark.SparkContext$$anonfun$assertNoOtherContextIsRunning$2.apply(SparkContext.scala:2211) >> at >> org.apache.spark.SparkContext$$anonfun$assertNoOtherContextIsRunning$2.apply(SparkContext.scala:2207) >> at scala.Option.foreach(Option.scala:257) >> at >> org.apache.spark.SparkContext$.assertNoOtherContextIsRunning(SparkContext.scala:2207) >> at >> org.apache.spark.SparkContext$.markPartiallyConstructed(SparkContext.scala:2277) >> at org.apache.spark.SparkContext.<init>(SparkContext.scala:91) >> at >> org.apache.spark.streaming.StreamingContext$.createNewSparkContext(StreamingContext.scala:837) >> at >> org.apache.spark.streaming.StreamingContext.<init>(StreamingContext.scala:84) >> at main.POC$.main(POC.scala:50) >> at main.POC.main(POC.scala) >> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) >> at >> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) >> at >> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) >> at java.lang.reflect.Method.invoke(Method.java:498) >> at >> org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:724) >> at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:180) >> at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:205) >> at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:119) >> at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala) >> >> >> >