Avoid race inserting new data in compaction_history during truncation…

… in SystemKeyspaceMigrator41Test.testMigrateCompactionHistory

Patch by marcuse; reviewed by Sam Tunnicliffe for CASSANDRA-19098

test/unit/org/apache/cassandra/db/SystemKeyspaceMigrator41Test.java

@@ -20,6 +20,7 @@
 
 import java.net.InetAddress;
 import java.nio.ByteBuffer;
+import java.util.Collections;
 import java.util.Date;
 import java.util.Map;
 import java.util.UUID;
@@ -32,6 +33,7 @@
 import org.apache.cassandra.config.DatabaseDescriptor;
 import org.apache.cassandra.cql3.CQLTester;
 import org.apache.cassandra.cql3.UntypedResultSet;
+import org.apache.cassandra.db.compaction.CompactionManager;
 import org.apache.cassandra.db.marshal.BytesType;
 import org.apache.cassandra.db.marshal.Int32Type;
 import org.apache.cassandra.db.marshal.LongType;
@@ -311,10 +313,15 @@ public void testMigrateCompactionHistory() throws Throwable
  assertEquals(ImmutableMap.of(), row.getMap("compaction_properties", UTF8Type.instance, UTF8Type.instance));
  }
  assertEquals(1, rowCount);
+ Keyspace.all().forEach(ks -> {
+ ks.getColumnFamilyStores().forEach(cfs -> {
+ cfs.disableAutoCompaction();
+ CompactionManager.instance.waitForCessation(Collections.singleton(cfs), (sstable) -> true);
+ });
+ });
 
  //Test nulls/missing don't prevent the row from propagating
  execute(String.format("TRUNCATE %s", table));
-
  execute(String.format("INSERT INTO %s (id) VALUES (?)", table), compactionId);
  SystemKeyspaceMigrator41.migrateCompactionHistory();