(Windows) force range-based repair to non-sequential mode

patch by Josh McKenzie; reviewed by jbellis for CASSANDRA-7541

CHANGES.txt

@@ -1,4 +1,5 @@
 2.0.10
+ * (Windows) force range-based repair to non-sequential mode (CASSANDRA-7541)
  * Fix range merging when DES scores are zero (CASSANDRA-7535)
  * Warn when SSL certificates have expired (CASSANDRA-7528)
  * Workaround JVM NPE on JMX bind failure (CASSANDRA-7254)

src/java/org/apache/cassandra/service/StorageService.java

@@ -2544,6 +2544,12 @@ public class StorageService extends NotificationBroadcasterSupport implements IE
 
         logger.info("starting user-requested repair of range {} for keyspace {} and column families {}",
                     repairingRange, keyspaceName, columnFamilies);
+
+        if (!FBUtilities.isUnix() && isSequential)
+        {
+            logger.warn("Snapshot-based repair is not yet supported on Windows.  Reverting to parallel repair.");
+            isSequential = false;
+        }
         return forceRepairAsync(keyspaceName, isSequential, dataCenters, hosts, repairingRange, columnFamilies);
     }