Blocker Description
System.InvalidOperationException: An invalid request URI was provided. The request URI must either be an absolute URI or BaseAddress must be set.
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at System.Net.Http.HttpClient.PrepareRequestMessage(HttpRequestMessage request)
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at System.Net.Http.HttpClient.SendAsync(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationToken cancellationToken)
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at System.Net.Http.HttpClient.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
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at System.Net.Http.HttpClient.PostAsync(Uri requestUri, HttpContent content, CancellationToken cancellationToken)
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at Couchbase.N1QL.QueryClient.<ExecuteQueryAsync>d__19`1.MoveNext()
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ExecuteQueryAsync uses GetQueryUri to get the query server's URI:
https://github.com/brantburnett/couchbase-net-client/blob/d852271c09a9116275e058412f1f82eabacbed01/Src/Couchbase/N1QL/QueryClient.cs#L367
Uri is considered healthy if it has failed less than 2 times since last success, returns null if no query nodes avail:
https://github.com/brantburnett/couchbase-net-client/blob/d852271c09a9116275e058412f1f82eabacbed01/Src/Couchbase/Configuration/ConfigContextBase.cs#L71
Count is only reset if there is a successful query, no other time:
https://github.com/brantburnett/couchbase-net-client/blob/d852271c09a9116275e058412f1f82eabacbed01/Src/Couchbase/N1QL/QueryClient.cs#L387
So, basically, once the client considers the query node down it will never use it again (except maybe if there's a rebalance?)