- What I did

In a dynamic environment, it is possible that some of the keys may
disappear between invoking keys() and get_all().
Prevent unnecessary timeout of blocking get_all().
Add more snmp no blocking fix for sonic-net#255

- How I did it
Modify the blocking mode from True to False

- How to verify it
Use server to send with 1000 requests/second. Keep test for weekend and it do not happen.

src/sonic_ax_impl/mibs/__init__.py

@@ -260,7 +260,7 @@ def init_mgmt_interface_tables(db_conn):
     if_alias_map = dict()
 
     for if_name in oid_name_map.values():
-        if_entry = db_conn.get_all(CONFIG_DB, mgmt_if_entry_table(if_name), blocking=True)
+        if_entry = db_conn.get_all(CONFIG_DB, mgmt_if_entry_table(if_name), blocking=False)
         if_alias_map[if_name] = if_entry.get('alias', if_name)
 
     logger.debug("Management alias map:\n" + pprint.pformat(if_alias_map, indent=2))
@@ -319,7 +319,7 @@ def init_sync_d_interface_tables(db_conn):
     if_alias_map = dict()
 
     for if_name in if_name_map:
-        if_entry = db_conn.get_all(APPL_DB, if_entry_table(if_name), blocking=True)
+        if_entry = db_conn.get_all(APPL_DB, if_entry_table(if_name), blocking=False)
         if_alias_map[if_name] = if_entry.get('alias', if_name)
 
     logger.debug("Chassis name map:\n" + pprint.pformat(if_alias_map, indent=2))

src/sonic_ax_impl/mibs/ieee802_1ab.py

@@ -212,7 +212,7 @@ def _get_if_entry(self, if_name):
         else:
             return None
 
-        return Namespace.dbs_get_all(self.db_conn, db, if_table, blocking=True)
+        return Namespace.dbs_get_all(self.db_conn, db, if_table, blocking=False)
 
     def update_interface_data(self, if_name):
         """

src/sonic_ax_impl/mibs/ietf/rfc1213.py

@@ -470,7 +470,7 @@ def _get_if_entry(self, sub_id):
         else:
             return None
 
-        return Namespace.dbs_get_all(self.db_conn, db, if_table, blocking=True)
+        return Namespace.dbs_get_all(self.db_conn, db, if_table, blocking=False)
 
     def _get_if_entry_state_db(self, sub_id):
         """

src/sonic_ax_impl/mibs/ietf/rfc2863.py

@@ -287,7 +287,7 @@ def _get_if_entry(self, oid):
         else:
             return None
 
-        return Namespace.dbs_get_all(self.db_conn, db, if_table, blocking=True)
+        return Namespace.dbs_get_all(self.db_conn, db, if_table, blocking=False)
 
     def get_high_speed(self, sub_id):
         """