Github user mridulm commented on a diff in the pull request:
https://github.com/apache/spark/pull/17665#discussion_r112060395
--- Diff:
resource-managers/mesos/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosSecurityManager.scala
---
@@ -0,0 +1,66 @@
+/*
+ * 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.scheduler.cluster.mesos
+
+import javax.xml.bind.DatatypeConverter
+
+import org.apache.hadoop.security.{Credentials, UserGroupInformation}
+
+import org.apache.spark.SparkConf
+import org.apache.spark.deploy.SparkHadoopUtil
+import org.apache.spark.deploy.mesos.config
+import org.apache.spark.deploy.security.ConfigurableCredentialManager
+import org.apache.spark.internal.Logging
+
+
+private[mesos] class MesosSecurityManager extends Logging {
+ def isSecurityEnabled(): Boolean = {
+ UserGroupInformation.isSecurityEnabled
+ }
+
+ /** Writes delegation tokens to spark.mesos.kerberos.ugiTokens */
+ def setUGITokens(conf: SparkConf): Unit = {
+ val userCreds = getDelegationTokens(conf)
+
+ val byteStream = new java.io.ByteArrayOutputStream(1024 * 1024)
+ val dataStream = new java.io.DataOutputStream(byteStream)
+ userCreds.writeTokenStorageToStream(dataStream)
+ val credsBytes = byteStream.toByteArray
+
+ logInfo(s"Writing ${credsBytes.length} bytes to
${config.USER_CREDENTIALS.key}.")
+
+ val creds64 = DatatypeConverter.printBase64Binary(credsBytes)
+ conf.set(config.USER_CREDENTIALS, creds64)
+ }
+
+ /**
+ * Returns the user's credentials, with new delegation tokens added for
all configured
+ * services.
+ */
+ private def getDelegationTokens(conf: SparkConf): Credentials = {
+ val userCreds = UserGroupInformation.getCurrentUser.getCredentials
+ val numTokensBefore = userCreds.numberOfTokens
+ val hadoopConf = SparkHadoopUtil.get.newConfiguration(conf)
+ val credentialManager = new ConfigurableCredentialManager(conf,
hadoopConf)
+ credentialManager.obtainCredentials(hadoopConf, userCreds)
--- End diff --
Yes, that is why I said this is potentially buggy :-)
As it currently stands in the current happy path - since there is only a
single invocation of the method, it will work.
But as soon as another invocation of the method happens in the same jvm
(through any means); it will fail to acquire tokens.
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