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

    https://github.com/apache/spark/pull/19717#discussion_r154833630
  
    --- Diff: 
resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/submit/DriverConfigurationStepsOrchestrator.scala
 ---
    @@ -0,0 +1,121 @@
    +/*
    + * 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.k8s.submit
    +
    +import org.apache.spark.SparkConf
    +import org.apache.spark.deploy.k8s.Config._
    +import org.apache.spark.deploy.k8s.ConfigurationUtils
    +import org.apache.spark.deploy.k8s.Constants._
    +import org.apache.spark.deploy.k8s.submit.steps._
    +import org.apache.spark.launcher.SparkLauncher
    +import org.apache.spark.util.SystemClock
    +
    +/**
    + * Constructs the complete list of driver configuration steps to run to 
deploy the Spark driver.
    + */
    +private[spark] class DriverConfigurationStepsOrchestrator(
    +    namespace: String,
    +    kubernetesAppId: String,
    +    launchTime: Long,
    +    mainAppResource: Option[MainAppResource],
    +    appName: String,
    +    mainClass: String,
    +    appArgs: Array[String],
    +    submissionSparkConf: SparkConf) {
    +
    +  // The resource name prefix is derived from the application name, making 
it easy to connect the
    +  // names of the Kubernetes resources from e.g. kubectl or the Kubernetes 
dashboard to the
    +  // application the user submitted. However, we can't use the application 
name in the label, as
    +  // label values are considerably restrictive, e.g. must be no longer 
than 63 characters in
    +  // length. So we generate a separate identifier for the app ID itself, 
and bookkeeping that
    +  // requires finding "all pods for this application" should use the 
kubernetesAppId.
    +  private val kubernetesResourceNamePrefix =
    --- End diff --
    
    I cant see rest of the context of this conversation - but UUID will be 36 
odd bytes, well within the 63 char limit ?


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