fix ratis master suite flakes

Author: afterincomparableyum

master/src/test/java/org/apache/celeborn/service/deploy/master/clustermeta/ha/RatisMasterStatusSystemSuiteJ.java

@@ -119,6 +119,15 @@ public static void resetRaftServer(
 
     while (!serversStarted) {
       try {
+        // Re-point each server to a fresh storage directory on every attempt. Ratis releases the
+        // storage directory lock asynchronously on close(), so a failed attempt (e.g. a random
+        // ratis port collision) can leave the previous directory locked. Reusing the same
+        // directory on retry then fails with "directory is already locked"; allocating a clean
+        // directory each time avoids contending for a lock that has not been released yet.
+        configureServerConf(conf1, 1);
+        configureServerConf(conf2, 2);
+        configureServerConf(conf3, 3);
+
         STATUSSYSTEM1 = new HAMasterMetaManager(mockRpcEnv, conf1);
         STATUSSYSTEM2 = new HAMasterMetaManager(mockRpcEnv, conf2);
         STATUSSYSTEM3 = new HAMasterMetaManager(mockRpcEnv, conf3);