Disable cleanup if mode is read only

Former-commit-id: 09655e2bb8a52466c1732c829519742867cf07a3

cpp/CHANGELOG.md

@@ -25,6 +25,7 @@ Please mark all change in change log and use the ticket from JIRA.
 - MS-90 - Fix arch match incorrect on ARM
 - MS-99 - Fix compilation bug
 - MS-110 - Avoid huge file size
+- MS-148 - Disable cleanup if mode is read only
 
 ## Improvement
 - MS-82 - Update server startup welcome message

cpp/src/db/MySQLMetaImpl.cpp

@@ -162,7 +162,9 @@ namespace meta {
             ENGINE_LOG_DEBUG << "MySQL connection pool: maximum pool size = " << std::to_string(maxPoolSize);
             try {
 
-                CleanUp();
+                if (mode_ != Options::MODE::READ_ONLY) {
+                    CleanUp();
+                }
 
                 {
                     ScopedConnection connectionPtr(*mysql_connection_pool_, safe_grab);
@@ -457,7 +459,7 @@ namespace meta {
             } //Scoped Connection
 
 
-            if (mode_ != Options::MODE::SINGLE) {
+            if (mode_ == Options::MODE::CLUSTER) {
                 DeleteTableFiles(table_id);
             }