I am trying to setup my IDE to a scala spark application. I want to access
HDFS files from remote Hadoop server that has Kerberos enabled. My
understanding is I should be able to do that from Spark. Here is my code so
far:
val sparkConf = new SparkConf().setAppName(appName).setMaster(master);
if(jars.length>0) {
sparkConf.setJars(jars);
}
if(!properties.isEmpty) {
//val iter = properties.keys.iterator
for((k,v)<-properties)
sparkConf.set(k, v);
} else {
sparkConf
.set("spark.executor.memory", "1024m")
.set("spark.cores.max", "1")
.set("spark.default.parallelism", "4");
}
try {
if(!StringUtils.isBlank(principal) &&
!StringUtils.isBlank(keytab)) {
//UserGroupInformation.setConfiguration(config);
UserGroupInformation.loginUserFromKeytab(principal, keytab);
}
} catch {
case ioe:IOException =>{
println("Failed to login to Hadoop [principal = " +
principal + ", keytab
= " + keytab + "]");
ioe.printStackTrace();}
}
val sc = new SparkContext(sparkConf)
val MY_FILE: String = "hdfs://remoteserver:port/file.out"
val rDD = sc.textFile(MY_FILE,10)
println("Lines "+rDD.count);
I have core-site.xml in my classpath. I changed hadoop.ssl.enabled to false
as it was expecting a secret key. The principal I am using is correct. I
tried username/_HOST@fully.qualified.domain and
username@fully.qualified.domain with no success. I tried running spark in
local mode and yarn client mode. I am hoping someone has a recipe/solved
this problem. Any pointers to help setup/debug this problem will be
helpful.
I am getting following error message:
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:227)
at
org.apache.hadoop.security.UserGroupInformation.setConfiguration(UserGroupInformation.java:249)
at org.apache.spark.examples.SparkYarn$.launchClient(SparkYarn.scala:55)
at org.apache.spark.examples.SparkYarn$.main(SparkYarn.scala:83)
at org.apache.spark.examples.SparkYarn.main(SparkYarn.scala)
... 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:497)
at
org.apache.hadoop.security.authentication.util.KerberosUtil.getDefaultRealm(KerberosUtil.java:75)
at
org.apache.hadoop.security.HadoopKerberosName.setConfiguration(HadoopKerberosName.java:63)
... 11 more
Caused by: KrbException: Cannot locate default realm
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