blerer commented on a change in pull request #1276:
URL: https://github.com/apache/cassandra/pull/1276#discussion_r761960234



##########
File path: test/unit/org/apache/cassandra/cql3/CQLTester.java
##########
@@ -603,6 +603,11 @@ public ColumnFamilyStore 
getCurrentColumnFamilyStore(String keyspace)
              : Keyspace.open(keyspace).getColumnFamilyStore(currentTable);

Review comment:
       Should be replaced by `getColumnFamilyStore`

##########
File path: src/java/org/apache/cassandra/db/SystemKeyspaceMigrator41.java
##########
@@ -0,0 +1,179 @@
+/*
+ * 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.db;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Optional;
+import java.util.function.Function;
+
+import com.google.common.annotations.VisibleForTesting;
+import org.apache.commons.lang3.StringUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.apache.cassandra.config.DatabaseDescriptor;
+import org.apache.cassandra.cql3.QueryProcessor;
+import org.apache.cassandra.cql3.UntypedResultSet;
+import org.apache.cassandra.db.marshal.BytesType;
+import org.apache.cassandra.db.marshal.Int32Type;
+import org.apache.cassandra.db.marshal.UTF8Type;
+import org.apache.cassandra.db.marshal.UUIDType;
+import org.apache.cassandra.io.sstable.SequenceBasedSSTableUniqueIdentifier;
+import org.apache.cassandra.schema.SchemaConstants;
+
+/**
+ * Migrate 3.0 versions of some tables to 4.1. In this case it's just extra 
columns and some keys
+ * that are changed.
+ * <p>
+ * Can't just add the additional columns because they are primary key columns 
and C* doesn't support changing
+ * key columns even if it's just clustering columns.
+ */
+public class SystemKeyspaceMigrator41
+{
+    private static final Logger logger = 
LoggerFactory.getLogger(SystemKeyspaceMigrator41.class);
+
+    private SystemKeyspaceMigrator41()
+    {
+    }
+
+    public static void migrate()
+    {
+        migratePeers();
+        migratePeerEvents();
+        migrateTransferredRanges();
+        migrateAvailableRanges();
+        migrateSSTableActivity();
+    }
+
+    @VisibleForTesting
+    static void migratePeers()
+    {
+        migrateTable(SystemKeyspace.LEGACY_PEERS,
+                     SystemKeyspace.PEERS_V2,
+                     new String[]{ "peer",
+                                   "peer_port",
+                                   "data_center",
+                                   "host_id",
+                                   "preferred_ip",
+                                   "preferred_port",
+                                   "rack",
+                                   "release_version",
+                                   "native_address",
+                                   "native_port",
+                                   "schema_version",
+                                   "tokens" },
+                     row -> Collections.singletonList(new Object[]{ 
row.has("peer") ? row.getInetAddress("peer") : null,
+                                                                    
DatabaseDescriptor.getStoragePort(),
+                                                                    
row.has("data_center") ? row.getString("data_center") : null,
+                                                                    
row.has("host_id") ? row.getUUID("host_id") : null,
+                                                                    
row.has("preferred_ip") ? row.getInetAddress("preferred_ip") : null,
+                                                                    
DatabaseDescriptor.getStoragePort(),
+                                                                    
row.has("rack") ? row.getString("rack") : null,
+                                                                    
row.has("release_version") ? row.getString("release_version") : null,
+                                                                    
row.has("rpc_address") ? row.getInetAddress("rpc_address") : null,
+                                                                    
DatabaseDescriptor.getNativeTransportPort(),
+                                                                    
row.has("schema_version") ? row.getUUID("schema_version") : null,
+                                                                    
row.has("tokens") ? row.getSet("tokens", UTF8Type.instance) : null }));
+    }
+
+    @VisibleForTesting
+    static void migratePeerEvents()
+    {
+        migrateTable(SystemKeyspace.LEGACY_PEER_EVENTS,
+                     SystemKeyspace.PEER_EVENTS_V2,
+                     new String[]{ "peer",
+                                   "peer_port",
+                                   "hints_dropped" },
+                     row -> Collections.singletonList(
+                     new Object[]{ row.has("peer") ? 
row.getInetAddress("peer") : null,
+                                   DatabaseDescriptor.getStoragePort(),
+                                   row.has("hints_dropped") ? 
row.getMap("hints_dropped", UUIDType.instance, Int32Type.instance) : null }
+                     ));
+    }
+
+    @VisibleForTesting
+    static void migrateTransferredRanges()
+    {
+        migrateTable(SystemKeyspace.LEGACY_TRANSFERRED_RANGES,
+                     SystemKeyspace.TRANSFERRED_RANGES_V2,
+                     new String[]{ "operation", "peer", "peer_port", 
"keyspace_name", "ranges" },
+                     row -> Collections.singletonList(new Object[]{ 
row.has("operation") ? row.getString("operation") : null,
+                                                                    
row.has("peer") ? row.getInetAddress("peer") : null,
+                                                                    
DatabaseDescriptor.getStoragePort(),
+                                                                    
row.has("keyspace_name") ? row.getString("keyspace_name") : null,
+                                                                    
row.has("ranges") ? row.getSet("ranges", BytesType.instance) : null }));
+    }
+
+    @VisibleForTesting
+    static void migrateAvailableRanges()
+    {
+        migrateTable(SystemKeyspace.LEGACY_AVAILABLE_RANGES,
+                     SystemKeyspace.AVAILABLE_RANGES_V2,
+                     new String[]{ "keyspace_name", "full_ranges", 
"transient_ranges" },
+                     row -> Collections.singletonList(new Object[]{ 
row.getString("keyspace_name"),
+                                                                    
Optional.ofNullable(row.getSet("ranges", 
BytesType.instance)).orElse(Collections.emptySet()),
+                                                                    
Collections.emptySet() }));
+    }
+
+    @VisibleForTesting
+    static void migrateSSTableActivity()

Review comment:
       Any plan to test that scenario?




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