nvharikrishna commented on code in PR #4149:
URL: https://github.com/apache/cassandra/pull/4149#discussion_r2916230568


##########
test/unit/org/apache/cassandra/tools/CMSOfflineToolTest.java:
##########
@@ -0,0 +1,1834 @@
+/*
+ * 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.cassandra.tools;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Random;
+import java.util.Set;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+
+import org.apache.cassandra.config.DatabaseDescriptor;
+import org.apache.cassandra.dht.IPartitioner;
+import org.apache.cassandra.dht.Murmur3Partitioner;
+import org.apache.cassandra.dht.Range;
+import org.apache.cassandra.dht.Token;
+import org.apache.cassandra.io.util.FileInputStreamPlus;
+import org.apache.cassandra.io.util.FileOutputStreamPlus;
+import org.apache.cassandra.locator.InetAddressAndPort;
+import org.apache.cassandra.locator.Replica;
+import org.apache.cassandra.schema.DistributedSchema;
+import org.apache.cassandra.schema.KeyspaceMetadata;
+import org.apache.cassandra.schema.KeyspaceParams;
+import org.apache.cassandra.schema.Keyspaces;
+import org.apache.cassandra.schema.ReplicationParams;
+import org.apache.cassandra.schema.SchemaConstants;
+import org.apache.cassandra.service.accord.AccordFastPath;
+import org.apache.cassandra.service.accord.AccordStaleReplicas;
+import 
org.apache.cassandra.service.consensus.migration.ConsensusMigrationState;
+import org.apache.cassandra.tcm.ClusterMetadata;
+import org.apache.cassandra.tcm.ClusterMetadataService;
+import org.apache.cassandra.tcm.Epoch;
+import org.apache.cassandra.tcm.membership.Directory;
+import org.apache.cassandra.tcm.membership.Location;
+import org.apache.cassandra.tcm.membership.NodeAddresses;
+import org.apache.cassandra.tcm.membership.NodeId;
+import org.apache.cassandra.tcm.membership.NodeState;
+import org.apache.cassandra.tcm.membership.NodeVersion;
+import org.apache.cassandra.tcm.ownership.DataPlacement;
+import org.apache.cassandra.tcm.ownership.DataPlacements;
+import org.apache.cassandra.tcm.ownership.TokenMap;
+import org.apache.cassandra.tcm.ownership.UniformRangePlacement;
+import org.apache.cassandra.tcm.sequences.BootstrapAndJoin;
+import org.apache.cassandra.tcm.sequences.BootstrapAndReplace;
+import org.apache.cassandra.tcm.sequences.InProgressSequences;
+import org.apache.cassandra.tcm.sequences.LeaveStreams;
+import org.apache.cassandra.tcm.sequences.LockedRanges;
+import org.apache.cassandra.tcm.sequences.Move;
+import org.apache.cassandra.tcm.sequences.UnbootstrapAndLeave;
+import org.apache.cassandra.tcm.serialization.VerboseMetadataSerializer;
+import org.apache.cassandra.tcm.serialization.Version;
+import org.apache.cassandra.tcm.transformations.PrepareJoin;
+import org.apache.cassandra.tcm.transformations.PrepareLeave;
+import org.apache.cassandra.tcm.transformations.PrepareMove;
+import org.apache.cassandra.tcm.transformations.PrepareReplace;
+import org.apache.cassandra.tcm.transformations.Register;
+
+import static org.apache.cassandra.config.DatabaseDescriptor.getStoragePort;
+import static 
org.apache.cassandra.distributed.test.log.ClusterMetadataTestHelper.prepareJoin;
+import static org.assertj.core.api.Assertions.assertThat;
+
+
+public class CMSOfflineToolTest extends OfflineToolUtils

Review Comment:
   I see the same issue with other tooling test cases as well. I believe it 
started failing after 
https://github.com/apache/cassandra/commit/940739a4889794a5f198731b152c70e86bc95976#diff-2a22a979edab7acc8cc1067910e1a1e3db8866c61c4d207b53c6e15d409fe103L115
 which removed the removal of initial threads by name. Now 
`org.apache.cassandra.tools.OfflineToolUtils#assertNoUnexpectedThreadsStarted` 
is using only regex comparison and RMI thread names as regex are not matching 
themselves, leading to the unwanted thread issue.
   
   Thought this is the desired behavior and did not fix it. But, pushed the 
change now as a separate commit 
https://github.com/apache/cassandra/pull/4149/changes/80765145f49f9e8169e5bc9d06856233955fdeb5.
 
   
   Surprisingly, I did not face this issue when I ran in debug mode or from the 
command line. I found that adding `-XX:+DisableAttachMechanism` to the JVM args 
helped to fix the issue (without the commit mentioned above), even when I ran 
it from IntelliJ. I am not sure if it is the expected behavior though.



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