MDEV-9544 FLUSH [RELAY] LOGS does not rotate logs for a named slave

Problem:- In the case of multisource replication/named slave
when we run "FLUSH LOGS" , it does not flush logs.

Solution:- A new function Master_info_index->flush_all_relay_logs()
is created which will rotate relay logs for all named slave.
This will be called in reload_acl_and_cache function when
connection_name.length == 0

1 files changed, 6 insertions, 2 deletions

diff --git a/sql/sql_reload.cc b/sql/sql_reload.cc
index 995c4c0a838..376dfeb1542 100644
--- a/sql/sql_reload.cc
+++ b/sql/sql_reload.cc
@@ -181,8 +181,12 @@ bool reload_acl_and_cache(THD *thd, unsigned long long options,
       slave is not likely to have the same connection names.
     */
     tmp_write_to_binlog= 0;
-
-    if (!(mi= (get_master_info(&connection_name,
+    if (connection_name.length == 0)
+    {
+      if (master_info_index->flush_all_relay_logs())
+          *write_to_binlog= -1;
+    }
+    else if (!(mi= (get_master_info(&connection_name,
                                Sql_condition::WARN_LEVEL_ERROR))))
     {
       result= 1;