galera_connect.inc sleeps one second on each invocation

# Temporal solution to avoid concurrent IST MDEV-7178

--sleep 1

diff --git a/mysql-test/include/galera_connect.inc b/mysql-test/include/galera_c

onnect.inc

index 5e72cf9ed23..aa1521caa74 100644

--- a/mysql-test/include/galera_connect.inc

+++ b/mysql-test/include/galera_connect.inc

@@ -20,6 +20,14 @@

 # $galera_debug

 #   Print debug information.

 #

+# $galera_wait_synced

+#   If set, wait for the node to reach the 'Synced' state after connecting.

+#   This is a one-shot flag: it is cleared at the end of this include, so it

+#   must be set before every source. Callers that connect to a node which is

+#   expected to become Synced (e.g. galera_init.inc during cluster bring-up)

+#   should set it; callers that connect to a node in a non-Primary, donor or

+#   otherwise desynced state must leave it unset.

+#

 if (!$galera_connection_name)

 {

@@ -50,10 +58,41 @@ if ($galera_debug)

 --enable_query_log

 }

-# Temporal solution to avoid concurrent IST MDEV-7178

---sleep 1

-

 # Open a connection

 --disable_query_log

 --connect($galera_connection_name,$galera_connection_address,root,,test,$_galera_port,)

 --enable_query_log

+

+if ($galera_wait_synced)

+{

+  --disable_query_log

+  --disable_result_log

+  --enable_reconnect

+  let $wait_counter = 600;

+  while ($wait_counter)

+  {

+    --disable_abort_on_error

+    let $synced = `SELECT VARIABLE_VALUE = 'Synced' FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_local_state_comment'`;

+    --enable_abort_on_error

+    if ($synced)

+    {

+      let $wait_counter = 0;

+    }

+    if (!$synced)

+    {

+      real_sleep 0.1;

+      dec $wait_counter;

+    }

+  }

+  --disable_reconnect

+  --enable_query_log

+  --enable_result_log

+

+  if (!$synced)

+  {

+    --die Node $galera_connection_name did not reach Synced state in galera_connect.inc

+  }

+}

+

+# Clear the one-shot flag so it does not leak to later galera_connect.inc calls.

+--let $galera_wait_synced= 0

diff --git a/mysql-test/include/galera_init.inc b/mysql-test/include/galera_init.inc

index 79591973862..1105ef7b0ce 100644

--- a/mysql-test/include/galera_init.inc

+++ b/mysql-test/include/galera_init.inc

@@ -19,6 +19,8 @@ while ($_galera_node)

 {

   --let $galera_connection_name= node_$_galera_node

   --let $galera_server_number= $_galera_node

+  # During bring-up every node is expected to become Synced.

+  --let $galera_wait_synced= 1

   --source include/galera_connect.inc

   --dec $_galera_node