warrenzhu25 commented on a change in pull request #30175:
URL: https://github.com/apache/spark/pull/30175#discussion_r582412333



##########
File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/continuous/EpochCoordinator.scala
##########
@@ -267,4 +268,23 @@ private[continuous] class EpochCoordinator(
       queryWritesStopped = true
       context.reply(())
   }
+
+  private def checkTotalCores(): Unit = {
+    val INSTRUCTION_FOR_FEWER_CORES =
+      """
+        |Total %s (kafka partitions) * %s (cpus per task) = %s needed,
+        |but only have %s (executors) * %s (cores per executor) = %s (total 
cores).
+        |Please increase total number of executor cores to at least %s.
+    """.stripMargin
+    val numExecutors = session.conf.get("spark.executor.instances", "1").toInt

Review comment:
       Thanks for suggestions. Any idea how to get BlockManagerMaster instance 
here?




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