[GitHub] style95 opened a new pull request #2810: Add couchdb clustering

[gi...@git.apache.org]

style95 opened a new pull request #2810: Add couchdb clustering
URL: https://github.com/apache/incubator-openwhisk/pull/2810
 
 
   This pr is to deploy couchdb cluster.
   From 2.0 CouchDB officially support clustering.
   
   Notable changes are as follow:
   
   ### Image of CouchDB is changed to the one from Apache.
   
   `klaemo/couchdb` is superseded by `apache/couchdb`.
   Accordingly version is also updated to 2.1
   
   ### Coordinator node.
   
   Since we need one coordinator node to setup CouchDB cluster, first host in db group becomes coordinator node.
   
   ### New environment variables for cluster.
   Important factors for CouchDB cluster is the number of shards and the number of quorums.
   Corresponding environment variables are introduced.
   
   
   Note: Please be informed that, current version of `apache/couchdb:2.1` does not support these values, so I created a pull request for this.
   Once this pr is merged, those environment variables will be available.
   https://github.com/apache/couchdb-docker/pull/32
   
   
   This pr also can address the problem reported by this issue: #2808
 
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