我看到了我在主节点上慢慢用尽Java堆的问题。以下是我创建的一个简单的示例,它仅重复200次。大约1小时内,主人的设置在内存中耗尽,并带有以下错误:
16/12/15 17:55:46 INFO YarnSchedulerBackend$YarnDriverEndpoint: Launching task 97578 on executor id: 9 hostname: ip-xxx-xxx-xx-xx
#
# java.lang.OutOfMemoryError: Java heap space
# -XX:OnOutOfMemoryError="kill -9 %p"
# Executing /bin/sh -c "kill -9 20160"...
代码:
import org.apache.spark.sql.functions._
import org.apache.spark._
object MemTest {
case class X(colval: Long, colname: Long, ID: Long)
def main(args: Array[String]) {
val conf = new SparkConf().setAppName("MemTest")
val spark = new SparkContext(conf)
val sc = org.apache.spark.sql.SQLContext.getOrCreate(spark)
import sc.implicits._;
for( a <- 1 to 200)
{
var df = spark.parallelize((1 to 5000000).map(x => X(x.toLong, x.toLong % 10, x.toLong / 10 ))).toDF()
df = df.groupBy("ID").pivot("colname").agg(max("colval"))
df.count
}
spark.stop()
}
}
我使用m4.xlarge(4个节点 1个主)在AWS EMR-5.1.0上运行。这是我的火花设置
{
"Classification": "spark-defaults",
"Properties": {
"spark.dynamicAllocation.enabled": "false",
"spark.executor.instances": "16",
"spark.executor.memory": "2560m",
"spark.driver.memory": "768m",
"spark.executor.cores": "1"
}
},
{
"Classification": "spark",
"Properties": {
"maximizeResourceAllocation": "false"
}
},
i使用
与SBT编译name := "Simple Project"
version := "1.0"
scalaVersion := "2.11.7"
libraryDependencies ++= Seq(
"org.apache.spark" %% "spark-core" % "2.0.2" % "provided",
"org.apache.spark" %% "spark-sql" % "2.0.2")
然后使用
运行它spark-submit --class MemTest target/scala-2.11/simple-project_2.11-1.0.jar
使用jmap -histo
查看内存,我看到java.lang.Long
和scala.Tuple2
继续生长。
您确定群集上安装的火花版本是2.0.2吗?
或群集上有几个火花安装,您确定要调用正确的(2.0.2)Spark-Submit?
(不幸的是,我无法发表评论,所以这就是我将其发布为答案的原因)