Refactored ExportSystem to:
- Only fetch message counts once (instead of a query per member)
- Fetch switches using the newly refactored GetTruncatedSwitchList (gets switches and their members in one shot instead of querying for switch members one switch at a time)
- Added a new MessageCountsPerMember method to MemberStore to support the above
- Modified GetTruncatedSwitchList query to retrieve switches with no members (wasn't important for frontpercent, but is if we're reusing that method here)
This doesn't require any index changes beyond those that support GetTruncatedSwitchList, though we can see a small benefit with an index on messages covering the member column (valuable for other reasons outside of these additions).
Refactored GetTruncatedSwitchList to:
- Only fetch switches in the requested range
- Fetch switch members in bulk rather than one switch at a time
This uses a new GetSwitchMembersList method that requires the following indexes:
CREATE INDEX ix_switches_system
ON public.switches USING btree
(system ASC NULLS LAST)
INCLUDE("timestamp")
TABLESPACE pg_default;
CREATE INDEX ix_switch_members_switch
ON public.switch_members USING btree
(switch ASC NULLS LAST)
INCLUDE(member)
TABLESPACE pg_default;
- ImportSystem builds a mapping of data file HID to current system HID
- Switches in a data file are reconciled with system members' actual IDs using this mapping
- SwitchStore provides a RegisterSwitches method to register multiple switches
- RegisterSwitches only imports a switch if one does not exist with the same timestamp
- The number of switches created is logged
Instead of acquiring a connection per service per request, we
acquire connections more often but at a more granular level, meaning
they're also disposed of more quickly instead of staying for a long time
in case of long-running commands or leaks.
