安全集群使用HiBench工具运行sparkbench获取不到realm

问题

运行HiBench6的sparkbench任务，如Wordcount，任务执行失败，bench.log显示Yarn任务执行失败，登录Yarn UI，查看对应application的失败信息，显示如下：

Exception in thread "main" org.apache.spark.SparkException: Unable to load YARN support
  at org.apache.spark.deploy.SparkHadoopUtil$.liftedTree1$1(SparkHadoopUtil.scala:390)
  at org.apache.spark.deploy.SparkHadoopUtil$.yarn$lzycompute(SparkHadoopUtil.scala:385)
  at org.apache.spark.deploy.SparkHadoopUtil$.yarn(SparkHadoopUtil.scala:385)
  at org.apache.spark.deploy.SparkHadoopUtil$.get(SparkHadoopUtil.scala:410)
  at org.apache.spark.deploy.yarn.ApplicationMaster$.main(ApplicationMaster.scala:796)
  at org.apache.spark.deploy.yarn.ExecutorLauncher$.main(ApplicationMaster.scala:821)
  at org.apache.spark.deploy.yarn.ExecutorLauncher.main(ApplicationMaster.scala)
 Caused by: java.lang.IllegalArgumentException: Can't get Kerberos realm
  at org.apache.hadoop.security.HadoopKerberosName.setConfiguration(HadoopKerberosName.java:65)
  at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:288)
  at org.apache.hadoop.security.UserGroupInformation.setConfiguration(UserGroupInformation.java:336)
  at org.apache.spark.deploy.SparkHadoopUtil.<init>(SparkHadoopUtil.scala:51)
  at org.apache.spark.deploy.yarn.YarnSparkHadoopUtil.<init>(YarnSparkHadoopUtil.scala:49)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
  at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
  at java.lang.Class.newInstance(Class.java:442)
  at org.apache.spark.deploy.SparkHadoopUtil$.liftedTree1$1(SparkHadoopUtil.scala:387)
  ... 6 more
 Caused by: java.lang.reflect.InvocationTargetException
  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.hadoop.security.authentication.util.KerberosUtil.getDefaultRealm(KerberosUtil.java:88)
  at org.apache.hadoop.security.HadoopKerberosName.setConfiguration(HadoopKerberosName.java:63)
  ... 16 more
 Caused by: KrbException: Cannot locate default realm
  at sun.security.krb5.Config.getDefaultRealm(Config.java:1029)
  ... 22 more

回答

失败原因是C80SPC200版本开始，安装集群不再替换/etc/krb5.conf文件，改为通过配置参数指定到客户端内krb5路径，而HiBench并不引用客户端配置文件。解决方案：将客户端/opt/client/KrbClient/kerberos/var/krb5kdc/krb5.conf，copy覆盖集群内所有节点的/etc/krb5.conf，注意替换前需要备份。