Specification

Consul Kv Datastore

Fireap stores its working data on Consul Kv.
All kinds of data appear in the table below:

path	data type	description
`fireap/<app>/lock`	String	Task execution lock to avoid multiple execution at the same time
`fireap/<app>/nodes/<node>/version`	String	Last executed task version on `<node>`
`fireap/<app>/nodes/<node>/semaphore`	Integer	How many subscribers are acceptable for `<node>`
`fireap/<app>/nodes/<node>/update_info`	JSON	Includes date when last task execution completed and from which host `<node>` "pulled" the update

Here are some supplementary information:

Fireap does not memorize version history but only last executed version.
When a subscriber "pulls" updates from a remote node, it decrements the semaphore number of the remote node. This reduction is done by Consul HTTP API with ?cas= parameter to safely update the value.
Format of update_info goes like below:
- {"updated_at":"2016-03-20 22:24:09 +0900","remote_node":"xxx01"}.
- This data is only for monitor use.