[GitHub] spark pull request: [SPARK-4224] [Core][YARN] - Support group acls...

[tgravescs <gi...@git.apache.org>]

Github user tgravescs commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12760#discussion_r61485159
  
    --- Diff: core/src/main/scala/org/apache/spark/security/ShellBasedGroupsMappingProvider.scala ---
    @@ -0,0 +1,53 @@
    +/*
    + * 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.security
    +
    +import org.apache.spark.internal.Logging
    +import org.apache.spark.util.Utils
    +
    +/**
    + * This class is responsible for getting the groups for a particular user in Unix based
    + * environments. This implementation uses the Unix Shell based id command to fetch the user groups
    + * for the specified user. It does not cache the user groups as the invocations are expected
    + * to be infrequent.
    +*/
    +
    +private[spark] class ShellBasedGroupsMappingProvider extends GroupMappingServiceProvider
    +  with Logging {
    +
    +  override def getGroups(username: String): Set[String] = {
    +    val userGroups = getUnixGroups(username)
    +    logInfo("User: " + username + " Groups: " + userGroups.mkString(","))
    --- End diff --
    
    make this a debug message. 


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