[GitHub] KeonHee opened a new pull request #141: Add a membership management using the discovery

[GitBox <gi...@apache.org>]

KeonHee opened a new pull request #141: Add a membership management using the discovery
URL: https://github.com/apache/incubator-openwhisk-package-alarms/pull/141
 
 
   about #133 
   
   
   ## Summary
   One socket is created which connects the nodes using unicast and elects a master node.
   Only the master fires the trigger. If the master node dies, elects another master.
   
   ## Advantage
   - We can build redanduncy with n. (Currently, only two)
   - Dependency with redis can be removed.
   - No external health check manager is required.
   
   ## Configuration
   1. `DISCOVER_DESTINATIONS`
     - Environment variable that turns this pr on/off.
     - If there is no value in this environment variable, the socket does not created, and the trigger execution logic functions as it did in the past(`activehost===host`).
     - Input the addresses of the nodes separated by a comma.
   ex) `DISCOVER_DESTINATIONS=host0.alarm.io,host1.alarm.io,host2.alarm.io`
   
   
   2. `DISCOVER_ADDRESS `,`DISCOVER_PORT `
     - The ip address and port where the socket is created.
   
   3. `DISCOVER_MASTER_TIMEOUT `, `DISCOVER_NODE_TIMEOUT `, `DISCOVER_CHECK_INTERVAL`, `DISCOVER_HELLO_INTERVAL`
     - It is configuration for health check interval and timeout.
     - The following conditions must be met:
   `DISCOVER_MASTER_TIMEOUT ` >= `DISCOVER_NODE_TIMEOUT ` >= `DISCOVER_CHECK_INTERVAL` > `DISCOVER_HELLO_INTERVAL`
   
   ## Compatibility
   If this option is turned off, it can still be used as it was.
   
   
   

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