[GitHub] [spark] mridulm commented on a change in pull request #32114: [SPARK-35011][CORE] Avoid Block Manager registrations when StopExecutor msg is in-flight

[GitBox <gi...@apache.org>]

mridulm commented on a change in pull request #32114:
URL: https://github.com/apache/spark/pull/32114#discussion_r611286561



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File path: core/src/main/scala/org/apache/spark/SparkEnv.scala
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@@ -355,6 +355,12 @@ object SparkEnv extends Logging {
 
     // Mapping from block manager id to the block manager's information.
     val blockManagerInfo = new concurrent.TrieMap[BlockManagerId, BlockManagerInfo]()
+    // Using a cache here since we only want to track recently removed executors to deny their
+    // block manager registration while their StopExecutor message is in-flight.
+    // Assuming average size of 6 bytes of execId and each entry in Cache taking around 64 bytes,
+    // max size of this cache = (6 + 64) * 30000 = 2.1MB
+    val recentlyRemovedExecutors = CacheBuilder.newBuilder().maximumSize(30000)
+      .build[String, String]()

Review comment:
       Any particular reason for such a high cache size ?




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