Monitor the Current Value of Node Spread Daemon Timeouts

Jim_Knicely · May 2019

When you know your network or nodes may be unable to respond for a specific amount of time due to network delays or temporary pauses of a VM, you can increase the spread timeout period to longer than this time using the SET_SPREAD_OPTION function (available starting in Vertica 9.2.1-0).

You can view the current value of the Spread Daemon timeout for each cluster node in the SPREAD_STATE system table (also available starting in Vertica 9.2.1-0).

Example:

dbadmin=> SELECT * FROM spread_state;
     node_name      | token_timeout
--------------------+---------------
 v_test_db_node0001 |          8000
 v_test_db_node0002 |          8000
 v_test_db_node0003 |          8000
(3 rows)

dbadmin=> SELECT SET_SPREAD_OPTION( 'TokenTimeout', '32000');
NOTICE 9003:  Spread has been notified about the change
                   SET_SPREAD_OPTION
--------------------------------------------------------
 Spread option 'TokenTimeout' has been set to '32000'.

(1 row)

dbadmin=> SELECT * FROM spread_state;
     node_name      | token_timeout
--------------------+---------------
 v_test_db_node0001 |         32000
 v_test_db_node0002 |         32000
 v_test_db_node0003 |         32000
(3 rows)

Helpful Links:
https://www.vertica.com/docs/9.2.x/HTML/Content/Authoring/UsingVerticaOnAzure/AdjustingSpreadDaemonTimeouts.htm

https://www.vertica.com/docs/9.2.x/HTML/Content/Authoring/SQLReferenceManual/Functions/VerticaFunctions/SET_SPREAD_OPTION.htm

https://www.vertica.com/docs/9.2.x/HTML/Content/Authoring/SQLReferenceManual/SystemTables/MONITOR/SPREAD_STATE.htm

Have fun!