[SPARK-27369][CORE] Setup resources when Standalone Worker starts up

core/src/main/scala/org/apache/spark/deploy/worker/Worker.scala

@@ -41,6 +41,8 @@ import org.apache.spark.internal.config.Tests.IS_TESTING
 import org.apache.spark.internal.config.UI._
 import org.apache.spark.internal.config.Worker._
 import org.apache.spark.metrics.{MetricsSystem, MetricsSystemInstances}
+import org.apache.spark.resource.ResourceInformation
+import org.apache.spark.resource.ResourceUtils.getOrDiscoverAllResources
 import org.apache.spark.rpc._
 import org.apache.spark.util.{SparkUncaughtExceptionHandler, ThreadUtils, Utils}
 
@@ -54,6 +56,7 @@ private[deploy] class Worker(
     workDirPath: String = null,
     val conf: SparkConf,
     val securityMgr: SecurityManager,
+    resourceFileOpt: Option[String] = None,
     externalShuffleServiceSupplier: Supplier[ExternalShuffleService] = null)
   extends ThreadSafeRpcEndpoint with Logging {
 
@@ -176,6 +179,9 @@ private[deploy] class Worker(
     masterRpcAddresses.length // Make sure we can register with all masters at the same time
   )
 
+  // visible for tests
+  private[deploy] var resources: Map[String, ResourceInformation] = _
+
   var coresUsed = 0
   var memoryUsed = 0
 
@@ -208,6 +214,7 @@ private[deploy] class Worker(
     logInfo("Spark home: " + sparkHome)
     createWorkDir()
     startExternalShuffleService()
+    setupWorkerResources()
     webUi = new WorkerWebUI(this, workDir, webUiPort)
     webUi.bind()
 
@@ -220,6 +227,16 @@ private[deploy] class Worker(
     metricsSystem.getServletHandlers.foreach(webUi.attachHandler)
   }
 
+  private def setupWorkerResources(): Unit = {
+    try {
+      resources = getOrDiscoverAllResources(conf, SPARK_WORKER_PREFIX, resourceFileOpt)
+    } catch {
+      case e: Exception =>
+        logError("Failed to setup worker resources: ", e)
+        System.exit(1)
+    }
+  }
+
   /**
    * Change to use the new master.
    *
@@ -785,7 +802,8 @@ private[deploy] object Worker extends Logging {
     val conf = new SparkConf
     val args = new WorkerArguments(argStrings, conf)
     val rpcEnv = startRpcEnvAndEndpoint(args.host, args.port, args.webUiPort, args.cores,
-      args.memory, args.masters, args.workDir, conf = conf)
+      args.memory, args.masters, args.workDir, conf = conf,
+      resourceFileOpt = conf.get(SPARK_WORKER_RESOURCE_FILE))
     // With external shuffle service enabled, if we request to launch multiple workers on one host,
     // we can only successfully launch the first worker and the rest fails, because with the port
     // bound, we may launch no more than one external shuffle service on each host.
@@ -809,15 +827,16 @@ private[deploy] object Worker extends Logging {
       masterUrls: Array[String],
       workDir: String,
       workerNumber: Option[Int] = None,
-      conf: SparkConf = new SparkConf): RpcEnv = {
+      conf: SparkConf = new SparkConf,
+      resourceFileOpt: Option[String] = None): RpcEnv = {
 
     // The LocalSparkCluster runs multiple local sparkWorkerX RPC Environments
     val systemName = SYSTEM_NAME + workerNumber.map(_.toString).getOrElse("")
     val securityMgr = new SecurityManager(conf)
     val rpcEnv = RpcEnv.create(systemName, host, port, conf, securityMgr)
     val masterAddresses = masterUrls.map(RpcAddress.fromSparkURL)
     rpcEnv.setupEndpoint(ENDPOINT_NAME, new Worker(rpcEnv, webUiPort, cores, memory,
-      masterAddresses, ENDPOINT_NAME, workDir, conf, securityMgr))
+      masterAddresses, ENDPOINT_NAME, workDir, conf, securityMgr, resourceFileOpt))
     rpcEnv
   }
 

core/src/main/scala/org/apache/spark/internal/config/Worker.scala

@@ -20,6 +20,17 @@ package org.apache.spark.internal.config
 import java.util.concurrent.TimeUnit
 
 private[spark] object Worker {
+  val SPARK_WORKER_PREFIX = "spark.worker"
+
+  val SPARK_WORKER_RESOURCE_FILE =
+    ConfigBuilder("spark.worker.resourcesFile")
+    .internal()
+    .doc("Path to a file containing the resources allocated to the worker. " +
+      "The file should be formatted as a JSON array of ResourceInformation objects. " +
+      "Only used internally in standalone mode.")
+    .stringConf
+    .createOptional
+
   val WORKER_TIMEOUT = ConfigBuilder("spark.worker.timeout")
     .longConf
     .createWithDefault(60)

core/src/test/scala/org/apache/spark/deploy/worker/WorkerSuite.scala

@@ -60,7 +60,7 @@ class WorkerSuite extends SparkFunSuite with Matchers with BeforeAndAfter {
     val securityMgr = new SecurityManager(conf)
     val rpcEnv = RpcEnv.create("test", "localhost", 12345, conf, securityMgr)
     _worker = new Worker(rpcEnv, 50000, 20, 1234 * 5, Array.fill(1)(RpcAddress("1.2.3.4", 1234)),
-      "Worker", "/tmp", conf, securityMgr, shuffleServiceSupplier)
+      "Worker", "/tmp", conf, securityMgr, None, shuffleServiceSupplier)
     _worker
   }