Spark on hdp Yarn Cluster 踩坑(hdp.version)

开源Spark运行在hdp的yarn集群失败分析:

部署方案

  • spark官网下载基于hdp的Hadoop版本的pre-built的spark安装包
  • 在机器上解压,并在spark-env中配置HADOOP_CONF_DIR,SPARK_CONF_DIR,spark-defaults中添加相关配置

测试情况:

a ) : local模式运行sparkPi 成功
b ) : 使用yarn-client模式运行异常,下面分析该异常

问题现象 :

在hdp的yarn集群时由于am启动异常而失败,异常“ ERROR SparkContext:91 - Error initializing SparkContext.org.apache.spark.SparkException: Yarn application has already ended! It might have been killed or unable to launch application master.”

查看am日志发现am启动失败点原因为"Error: Could not find or load main class org.apache.spark.deploy.yarn.ExecutorLauncher" 
该类时am启动的核心类,排查jar包异常发现该类所在jar包 spark-yarn*.jar存在且包含该类。

查看Yarn原生页面抛出打印异常: “Exception message: /data/hadoop/yarn/local/usercache/ocsp/appcache/application_1519982778829_0171/container_e37_1519982778829_0171_02_000001/launch_container.sh: line 21: $PWD:$PWD/__spark_conf__:$PWD/__spark_libs__/*:$HADOOP_CONF_DIR:/usr/hdp/current/hadoop-client/*:/usr/hdp/current/hadoop-client/lib/*:/usr/hdp/current/hadoop-hdfs-client/*:/usr/hdp/current/hadoop-hdfs-client/lib/*:/usr/hdp/current/hadoop-yarn-client/*:/usr/hdp/current/hadoop-yarn-client/lib/*:$PWD/mr-framework/hadoop/share/hadoop/mapreduce/*:$PWD/mr-framework/hadoop/share/hadoop/mapreduce/lib/*:$PWD/mr-framework/hadoop/share/hadoop/common/*:$PWD/mr-framework/hadoop/share/hadoop/common/lib/*:$PWD/mr-framework/hadoop/share/hadoop/yarn/*:$PWD/mr-framework/hadoop/share/hadoop/yarn/lib/*:$PWD/mr-framework/hadoop/share/hadoop/hdfs/*:$PWD/mr-framework/hadoop/share/hadoop/hdfs/lib/*:$PWD/mr-framework/hadoop/share/hadoop/tools/lib/*:/usr/hdp/${hdp.version}/hadoop/lib/hadoop-lzo-0.6.0.${hdp.version}.jar:/etc/hadoop/conf/secure:$PWD/__spark_conf__/__hadoop_conf__: bad substitution”
该异常是yarn在启动container时,调用launch_container.sh:脚本,该脚本返回点异常信息。 此处执行点时export CLASSPATH 也就是为调用container启动准备环境变量时,该行执行异常,导致添加classpath失败。进而导致找不到executor启动类。

该命令执行失败时由于命令中包含/usr/hdp/${hdp.version}/hadoop/lib/hadoop-lzo-0.6.0.${hdp.version}.jar。 该操作时为进程添加lzo包,已实现lzo的压缩格式。查看hdp的hadoop lib目录,然而并没有该包。可能时为了客户方便使用默认将该目录导入
    [root@hosttest lib]# ll | grep lzo
    [root@hosttest lib]# pwd
    /usr/hdp/2.6.0.3-8/hadoop/lib
    [root@hosttest lib]# ll | grep -i lzo
    [root@hosttest lib]# 

解决方法

由于没有找到将改目录从classpath中移除的方法,就采用添加—Dhdp.version的方式,让此命令可以正常执行
  添加方法: 在spark-default.conf配置文件中添加: spark.driver.extraJavaOptions -Dhdp.version=2.6.5 spark.yarn.am.extraJavaOptions -Dhdp.version=2.6.5
缺陷: 由于缺少真正的jar包。 因此lzo压缩算法不可用。
    原文作者:WestC
    原文地址: https://www.jianshu.com/p/de762c244663
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