spark IDE: System memory 251396096 must be at least 471859200
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Spark版本:2.1.2,spark自带scala版本2.11.8,spark IDE 版本4.7
Eclipse 中创建WordCount项目, 将scala library container 设置为2.11.11 , 将spark/jars中的jar都导入reference libraries,
代码
import org.apache.log4j.Loggerimport org.apache.log4j.Levelimport org.apache.spark.{ SparkConf, SparkContext }import org.apache.spark.rdd.RDDobject RunWordCount { def main(args: Array[String]): Unit = { Logger.getLogger("org").setLevel(Level.OFF) System.setProperty("spark.ui.showConsoleProgress", "false") println("开始运行RunWordCount") val sc = new SparkContext(new SparkConf().setAppName("wordCount").setMaster("local[1]"))//val sc = new SparkContext(new SparkConf().setAppName("wordCount").setMaster("local[1]").set("spark.testing.memory", "536870912")) println("开始读取文本文件...") val textFile = sc.textFile("data/LICENSE.txt") println("开始创建RDD...") val countsRDD = textFile.flatMap(line => line.split(" ")) .map(word => (word, 1)) .reduceByKey(_ + _) println("开始保存到文本文件...") try { countsRDD.saveAsTextFile("data/output") println("已经存盘成功") } catch { case e: Exception => println("输出目录已经存在,请先删除原有目录"); } }}
运行报错2
Exception in thread "main" java.lang.IllegalArgumentException: System memory 251396096 must be at least 471859200. Please increase heap size using the --driver-memory option or spark.driver.memory in Spark configuration. at org.apache.spark.memory.UnifiedMemoryManager$.getMaxMemory(UnifiedMemoryManager.scala:216) at org.apache.spark.memory.UnifiedMemoryManager$.apply(UnifiedMemoryManager.scala:198) at org.apache.spark.SparkEnv$.create(SparkEnv.scala:330) at org.apache.spark.SparkEnv$.createDriverEnv(SparkEnv.scala:174) at org.apache.spark.SparkContext.createSparkEnv(SparkContext.scala:257) at org.apache.spark.SparkContext.<init>(SparkContext.scala:432) at RunWordCount$.main(RunWordCount.scala:17) at RunWordCount.main(RunWordCount.scala)这是JVM申请的memory不够导致
参考http://blog.csdn.net/shenshendeai/article/details/54631237
应该在conf里设置一下spark.testing.memory.
通过尝试,发现可以有2个地方可以设置
1. 自己的源代码处,可以在conf之后加上:
val conf = new SparkConf().setAppName("word count")
conf.set("spark.testing.memory", "2147480000")//后面的值大于512m即可
2. 可以在Eclipse的Run Configuration处,有一栏是Arguments,下面有VMarguments,在下面添加下面一行(值也是只要大于512m即可)
-Dspark.testing.memory=1073741824
其他的参数,也可以动态地在这里设置,比如-Dspark.master=spark://hostname:7077
再运行就不会报这个错误了。
我用了第一个方法,修改成注释掉的那行代码,运行即不报错。
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