repl-delay-service

Service to monitor postgres slaves' replication delay.

You'll need a process on the master that regularly (eg. every 1s) writes a timestamp to a heartbeat table. On the slaves, the delta in the value from the clock will be a good estimate of the slave's delay.

Build

To build, you'll need rebar in your path.

make release
./rel/repl_delay_service/bin/repl_delay_service start
curl localhost:8080
curl localhost:8080/min
curl localhost:8080/max
./rel/repl_delay_service/bin/repl_delay_service stop

Configuration

Config is currently a hardcoded list of servers in apps/repl_delay_core/src/repl_delay_core_config.erl.

Layout

apps/repl_delay_core

Application that queries slaves and keeps replication front.

apps/repl_delay_webm