Github user mccheah commented on a diff in the pull request:
https://github.com/apache/spark/pull/4106#discussion_r23317321
--- Diff:
core/src/main/scala/org/apache/spark/deploy/StandaloneSparkHadoopUtil.scala ---
@@ -0,0 +1,76 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.deploy
+
+import java.security.PrivilegedAction
+
+import org.apache.hadoop.mapred.JobConf
+import org.apache.hadoop.security.UserGroupInformation
+import org.apache.spark.{SparkEnv, Logging}
+import sun.security.jgss.krb5.Krb5InitCredential
+
+import scala.sys.process.Process
+
+private[spark] class StandaloneSparkHadoopUtil extends SparkHadoopUtil {
+
+ val hadoopSecurityAuthenticationKey = "hadoop.security.authentication"
+ val principalKey = "dfs.namenode.kerberos.principal"
+ val keytabKey = "dfs.namenode.keytab.file"
+ val securityEnabledButKeyNotDefined = "Hadoop security was enabled, but
%s" +
+ "was not set in the hadoop configuration."
+
+ lazy val configuredPrivilegedUGI: UserGroupInformation = {
+ if ("kerberos".equals(conf.get(hadoopSecurityAuthenticationKey,
"simple"))) {
+ logInfo("Setting up kerberos to authenticate")
+ getConfValueOrNone(principalKey) match {
+ case Some(principal) =>
+ getConfValueOrNone(keytabKey) match {
+ case Some(keytab) =>
+ // Log in with the HDFS principal. However, this does NOT
get the TGT
+ // kinit must be executed manually in spark-env.sh or
somewhere similar
+
UserGroupInformation.loginUserFromKeytabAndReturnUGI(principal, keytab)
--- End diff --
I really don't understand this fully either, most of the comments are from
the long time I spent empirically testing this. But when I explicitly ran
kdestroy -A before launching Spark and reading from HDFS, I kept receiving
stack traces complaining about no tgt (ticket-granting-ticket) being there,
despite the fact that I had invoked loginUserFromKeytab(). What's worth
remarking is that once kinit is run once, the ticket can be renewed, or the
kerberos ticket configured so that it never needs to be renewed at all. I'm not
sure - are users of the history server merely running kinit once and then
letting the ticket be renewed often enough or setting the tickets' lifetime to
indefinite?
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