(fix)[db] Fix create database and create table data race (#44600)

There may be a race condition between CREATE DATABASE and CREATE TABLE.
When CREATE DATABASE is being executed, the edit log may get stuck,
while fullNameToDb in getDbNullable can still return the database. As a
result, the CREATE TABLE process continues, which may ultimately lead to
a strange order in the edit log of BDBJE, where CREATE TABLE appears
before CREATE DATABASE.

fe/fe-core/src/main/java/org/apache/doris/catalog/Database.java

@@ -93,7 +93,7 @@ public class Database extends MetaObject implements Writable, DatabaseIf<Table>,
     private final Map<Long, Table> idToTable;
     private ConcurrentMap<String, Table> nameToTable;
     // table name lower case -> table name
-    private final Map<String, String> lowerCaseToTableName;
+    private final ConcurrentMap<String, String> lowerCaseToTableName;
 
     // user define function
     @SerializedName(value = "name2Function")

fe/fe-core/src/main/java/org/apache/doris/datasource/InternalCatalog.java

@@ -441,8 +441,17 @@ public void createDb(CreateDbStmt stmt) throws DdlException {
                     ErrorReport.reportDdlException(ErrorCode.ERR_DB_CREATE_EXISTS, fullDbName);
                 }
             } else {
-                unprotectCreateDb(db);
-                Env.getCurrentEnv().getEditLog().logCreateDb(db);
+                if (!db.tryWriteLock(100, TimeUnit.SECONDS)) {
+                    LOG.warn("try lock failed, create database failed {}", fullDbName);
+                    ErrorReport.reportDdlException(ErrorCode.ERR_EXECUTE_TIMEOUT,
+                            "create database " + fullDbName + " time out");
+                }
+                try {
+                    unprotectCreateDb(db);
+                    Env.getCurrentEnv().getEditLog().logCreateDb(db);
+                } finally {
+                    db.writeUnlock();
+                }
             }
         } finally {
             unlock();