Node.js: No errors thrown when the Query node goes down leaving the application hanging

Problem:

A client application connecting to a Couchbase cluster with just one Query node, and performing N1QL queries, hangs when that Query node is down (failover / removed).

Reproduction:

Node SDK Client: 2.4.1 and 3 Node Couchbase 4.6.3 cluster:

  Node 1: Data + Query
  Node 2: Data + Index
  Node 3: Data

Application (try-cb) : https://github.com/couchbaselabs/try-cb-nodejs/

Procedure:

Start Application
Use GUI to Select Flights
Failover Node1
Application hangs.

Note:

Application responds when the Query node comes back up again, without having to disconnect.

Expected behavior:

Node.js should throw an error when the Query node goes down. This can be caught by the application which could display some message like "Service Temporarily Unavailable".

Log (with LCB_LOGLEVEL=5):

Attached. debug-2.4.1.log