[GitHub] [couchdb] nicknaychov commented on issue #2386: CouchDB Zones: How to verify if zones are setup correctly?

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nicknaychov commented on issue #2386: CouchDB Zones: How to verify if zones are setup correctly?
URL: https://github.com/apache/couchdb/issues/2386#issuecomment-572457662
 
 
   thank you for answer @kocolosk .
   
   That makes things little bit clearer. Just to add, I do not use placement but just z=2. I rely on "automatic" placement, since I need second cluster to be used as backup in case main site is down. I use couchdb prior to introducing the placement option, so I am not sure if I should use it and how exactly will fit in my case. 
   
   Would you actually recommend using of placement param in favor of z parameter?
   
   Is there any link describing when we should use placement vs the z param? Maybe one of them should be deprecated in future releases if they overlap functionality in order to avoid confusion.
   
   In my case with 4 nodes, 2 zones(z=2) and n=3 without using DB placement, if request comes to zone 1 then R/W will be done only to the 2 nodes from that zone and there will be no WAN crossing, correct?
   My purpose is to avoid WAN crossing and thus slowing down the cluster.
   
   BTW Shard map looks ok:
   `"shards": {
           "00000000-55555554": [
               "couchdb@pbx1-z1.domain.ca",
               "couchdb@pbx1-z2.domain.ca",
               "couchdb@pbx2-z2.domain.ca"
           ],
           "55555555-aaaaaaa9": [
               "couchdb@pbx1-z1.domain.ca",
               "couchdb@pbx1-z2.domain.ca",
               "couchdb@pbx2-z1.domain.ca"
           ],
           "aaaaaaaa-ffffffff": [
               "couchdb@pbx1-z2.domain.ca",
               "couchdb@pbx2-z1.domain.ca",
               "couchdb@pbx2-z2.domain.ca"
           ]
       }`
   
   Many thanks to anybody who can shed some light on this.

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