wohali commented on issue #796: CouchDB Error - No DB shards could be opened URL: https://github.com/apache/couchdb/issues/796#issuecomment-359060231 @FelipeTaiarol **Please respond** if this issue is still a problem with `max_dbs_open` increased to 15k and using `q=2`. If and when CouchDB ends up in an unresponsive state, please check the output of `localhost:5986/_system` and look at the message queue sizes. Is the `couch_server` message queue high? What those fabric timeout errors mean: Couch is trying to open a shard quickly to grab the security properties, and that's why the timeout is set to 100ms. If the request fails, it tries a different shard on a different node, and doubles the timeout. It will keep trying, doubling the timeout each time, until it runs out of shards, at which point you will get the `No DB shards could be opened` error.
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