yadavay-amzn commented on code in PR #55720:
URL: https://github.com/apache/spark/pull/55720#discussion_r3268549909


##########
sql/connect/client/jvm/src/test/scala/org/apache/spark/sql/application/AmmoniteReplE2ESuite.scala:
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@@ -0,0 +1,72 @@
+/*
+ * 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.sql.application
+
+import java.util.concurrent.TimeUnit
+
+import scala.collection.mutable.ArrayBuffer
+import scala.sys.process.BasicIO
+
+import org.apache.spark.sql.connect.test.{ConnectFunSuite, RemoteSparkSession}
+import org.apache.spark.tags.AmmoniteTest
+
+@AmmoniteTest
+class AmmoniteReplE2ESuite extends ConnectFunSuite with RemoteSparkSession {
+
+  private def runSparkShell(): (Int, String, String) = {
+    val sparkHome = sys.props.getOrElse(
+      "spark.test.home",
+      sys.env.getOrElse("SPARK_HOME", fail("spark.test.home or SPARK_HOME not 
set")))
+    val command = Seq(s"$sparkHome/bin/spark-shell", "--remote", 
s"sc://localhost:$serverPort")
+
+    val process = new ProcessBuilder(command: _*).start()
+    // Close stdin immediately so shell exits on EOF
+    process.getOutputStream.close()
+
+    val stdout = new ArrayBuffer[String]()
+    val stderr = new ArrayBuffer[String]()
+    val stdoutThread = new Thread() {
+      setDaemon(true)
+      override def run(): Unit = BasicIO.processFully(stdout += 
_)(process.getInputStream)
+    }
+    val stderrThread = new Thread() {
+      setDaemon(true)
+      override def run(): Unit = BasicIO.processFully(stderr += 
_)(process.getErrorStream)
+    }
+    stdoutThread.start()
+    stderrThread.start()
+
+    val exited = process.waitFor(60, TimeUnit.SECONDS)
+    if (!exited) {
+      process.destroyForcibly()
+      fail("spark-shell did not exit within 60 seconds")
+    }
+    stdoutThread.join(10000)
+    stderrThread.join(10000)
+    (process.exitValue(), stdout.mkString("\n"), stderr.mkString("\n"))
+  }
+
+  test("SPARK-56448: restarting spark-shell --remote does not throw NPE") {

Review Comment:
   Ran the `AmmoniteReplE2ESuite` test 10 times locally on current master (JDK 
17) and its passing consistently. So the flakiness seems specific to the CI 
run. 
   
   The error (`ExceptionInInitializerError` in Arrow's 
`DefaultAllocationManagerFactory` / Netty's `PooledByteBufAllocatorL`) looks 
like a JDK/Arrow memory allocator incompatibility which may be JDK version 
sensitive. The test itself just launches spark-shell --remote as a subprocess 
and it doesn't do anything Arrow/Netty-specific.
   
   @dongjoon-hyun / @peter-toth  Could you share which JDK vendor/version and 
CI environment produced the failure? Or a link to the CI job if you have it? I 
can deep dive to figure out the issue and try repro with same setup.



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