Fix restart issue

Author: houjun

src/server/pdc_server.c

@@ -955,6 +955,9 @@ PDC_Server_init(int port, hg_class_t **hg_class, hg_context_t **hg_context)
         printf("==PDC_SERVER[%d]: Read cache enabled!\n", pdc_server_rank_g);
 #endif
 
+    // Initialize IDIOMS
+    PDC_Server_metadata_index_init(pdc_server_size_g, pdc_server_rank_g);
+
     // TODO: support restart with different number of servers than previous run
     char checkpoint_file[ADDR_MAX + sizeof(int) + 1];
     if (is_restart_g == 1) {
@@ -993,9 +996,6 @@ PDC_Server_init(int port, hg_class_t **hg_class, hg_context_t **hg_context)
 
     n_metadata_g = 0;
 
-    // Initialize IDIOMS
-    PDC_Server_metadata_index_init(pdc_server_size_g, pdc_server_rank_g);
-
     // PDC transfer_request infrastructures
     PDC_server_transfer_request_init();
 #ifdef PDC_SERVER_CACHE