From 1e37c945f44837557014714886b09caeeecc9504 Mon Sep 17 00:00:00 2001
From: Jon Bratseth <bratseth@gmail.com>
Date: Thu, 24 Feb 2022 13:21:36 +0100
Subject: Make the error message meaningful for users

If application packages uses <nodes count=... syntax
but also have a hosts.xml file, and are deploying
self-hosted we will fail, but should do so with an
understandable error.
---
 .../java/com/yahoo/config/model/provision/HostsXmlProvisioner.java   | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'config-model/src/main/java/com/yahoo/config')

diff --git a/config-model/src/main/java/com/yahoo/config/model/provision/HostsXmlProvisioner.java b/config-model/src/main/java/com/yahoo/config/model/provision/HostsXmlProvisioner.java
index a9ee440f22c..5a6a8e86e6a 100644
--- a/config-model/src/main/java/com/yahoo/config/model/provision/HostsXmlProvisioner.java
+++ b/config-model/src/main/java/com/yahoo/config/model/provision/HostsXmlProvisioner.java
@@ -45,9 +45,12 @@ public class HostsXmlProvisioner implements HostProvisioner {
         throw new IllegalArgumentException("Unable to find host for alias '" + alias + "'");
     }
 
+    /** Called when provisioning nodes using &lt;nodes count="..." */
     @Override
     public List<HostSpec> prepare(ClusterSpec cluster, Capacity quantity, ProvisionLogger logger) {
-        throw new UnsupportedOperationException("Prepare on an XML host provisioner is not supported");
+        throw new UnsupportedOperationException("Using <nodes count=\"...\"> is not supported when there is a " +
+                                                "hosts.xml file. Remove hosts.xml to make this deployable on " +
+                                                "Vespa Cloud and single-node self-hosted instances.");
     }
 
     private HostSpec host2HostSpec(Host host) {
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