Viewing PGD topology v5

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Listing PGD groups

Using pgd-cli

Use the pgd-cli groups list command to list all groups in the PGD cluster:

pgd groups list
  Group Name  Parent Group Name Group Type     Nodes          
  ---------- ----------------- --------------- -----
  bdrgroup   bdrgroup          global          0
  group_a    bdrgroup          data            4
  group_b    bdrgroup          data            4    
  group_c    bdrgroup          data            1
  group_so   bdrgroup          subscriber-only 1

Using SQL

The following simple query lists all the PGD node groups of which the current node is a member. It currently returns only one row from bdr.local_node_summary.

SELECT node_group_name
FROM bdr.local_node_summary;

You can display the configuration of each node group using a more complex query:

SELECT g.node_group_name
, ns.pub_repsets
, ns.sub_repsets
, g.node_group_default_repset     AS default_repset
, node_group_check_constraints    AS check_constraints
FROM bdr.local_node_summary ns
JOIN bdr.node_group g USING (node_group_name);

Listing nodes in a PGD group

Using pgd-cli

Use the nodes list command to list all nodes in the PGD cluster:

pgd nodes list
  Node Name           Group Name Node Kind       Join State Node Status
  ------------------- ---------- --------------- ---------- -----------          
  bdr-a1              group_a    data            ACTIVE     Up
  bdr-a2              group_a    data            ACTIVE     Up     
  logical-standby-a1  group_a    standby         ACTIVE     Up
  witness-a           group_a    witness         ACTIVE     Up
  bdr-b1              group_b    data            ACTIVE     Up
  bdr-b2              group_b    data            ACTIVE     Up
  logical-standby-b1  group_b    standby         ACTIVE     Up
  witness-b           group_b    witness         ACTIVE     Up
  witness-c           group_c    witness         ACTIVE     Up
  subscriber-only-c1  group_so   subscriber-only ACTIVE     Up

Use grep with the group name to filter the list to a specific group:

pgd nodes list | grep group_b
  bdr-b1             group_b  data      ACTIVE     Up        
  bdr-b2             group_b  data      ACTIVE     Up    
  logical-standby-b1 group_b  standby   ACTIVE     Up   
  witness-b          group_b  witness   ACTIVE     Up

Using SQL

You can extract the list of all nodes in a given node group (such as mygroup) from the bdr.node_summary` view. For example:

SELECT node_name         AS name
, node_seq_id            AS ord
, peer_state_name        AS current_state
, peer_target_state_name AS target_state
, interface_connstr      AS dsn
FROM bdr.node_summary
WHERE node_group_name = 'mygroup';
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Creating and joining PGD groups

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Removing nodes and groups