This library builds a mesh from multiple tarantool instances. The mesh monitors itself, helps members discover everyone else and get notified about their status changes with low latency.
It is built upon the ideas from consul, or, more precisely, the SWIM algorithm.
Membership module works over UDP protocol and can operate
even before tarantool box.cfg
was initialized.
A member is represented by the table with fields:
uri
status
is a string:alive
,suspect
,dead
orleft
incarnation
which is incremented every time the instance is being suspected or dead or updates its payloadpayload
is a table with auxiliary data, which can be used by various modules to do whatever they wanttimestamp
is a value offiber.time64()
(in microseconds), corresponding to the last update of status or incarnation.timestamp
is always local and does not depent on other members' clock setting.clock_delta
is a time drift between member's clock (remote) and the local one (in microseconds).
Example:
---
uri: "localhost:33001"
status: "alive"
incarnation: 1
payload:
uuid: "2d00c500-2570-4019-bfcc-ab25e5096b73"
timestamp: 1522427330993752
clock_delta: 27810
...