18562: Update doc and config comments for UsePreemptibleInstances.

[arvados.git] / lib / config / config.default.yml

diff --git a/lib/config/config.default.yml b/lib/config/config.default.yml
index 98437e77584a525337c51076d7f0402e89748484..87d38ffe4bd380d3d98c37f9a0a2c0861a82850f 100644 (file)
--- a/lib/config/config.default.yml
+++ b/lib/config/config.default.yml
@@ -902,8 +902,16 @@ Clusters:
       # Schedule all child containers on preemptible instances (e.g. AWS
       # Spot Instances) even if not requested by the submitter.
       #
+      # If false, containers are scheduled on preemptible instances
+      # only when requested by the submitter.
+      #
+      # Note that arvados-cwl-runner does not currently offer a
+      # feature to request preemptible instances, so this value
+      # effectively acts as a cluster-wide decision about whether to
+      # use preemptible instances.
+      #
       # This flag is ignored if no preemptible instance types are
-      # configured.
+      # configured, and has no effect on top-level containers.
       UsePreemptibleInstances: true
 
       # PEM encoded SSH key (RSA, DSA, or ECDSA) used by the