[GitHub] wohali commented on issue #858: Cannot change shard map for system databases

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

wohali commented on issue #858: Cannot change shard map for system databases
URL: https://github.com/apache/couchdb/issues/858#issuecomment-333579565
 
 
   Original context:
   
   > I'm still seeing the same problem as described in COUCHDB-2424 with CouchDB 2.0.0 (Ubuntu) but it doesn't appear that I can reopen that issue.
   >
   > What I'm trying to do trying to get a newly added cluster node to participate in all the databases already created in the cluster so that I can then remove an existing node and replace it with the new one. The workflow I have is:
   >
   > -    Add the new node to the cluster using the _nodes endpoint. This works.
   > -    For each database edit the shard metadata document (e.g. _db/db_name) and add all shards to the new node.
   > 
   > This appears to work for all databases except the system databases. Essentially this means that you can't move the shards for these database off a node in order to retire that node.
   > 
   > An easy way to reproduce the issue is to open http://localhost:5986/_utils/#/database/_dbs/_metadata and then click "Save Changes" in Fauxton. The error "Save failed: Only reserved document ids may start with underscore." is displayed. Doing the same process for a user database works fine. Similarly, editing the document via curl also fails with the same error.
   
 
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