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eds: avoid send too many ClusterLoadAssignment requests (#7976)
During initializing secondary clusters, for each initialized cluster, a ClusterLoadAssignment request is sent to istio pilot with the cluster's name appended into request's resource_names list. With a huge number of clusters(e.g 10k clusters), this behavior slows down Envoy's initialization and consumes ton of memory. This change pauses ADS mux for ClusterLoadAssignment to avoid that. Risk Level: Medium Testing: tiny change, no test case added Fixes #7955 Signed-off-by: lhuang8 <lhuang8@ebay.com>
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