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Propagate message to a node only if the cluster link is healthy. (#11752)
Currently while a sharded pubsub message publish tries to propagate the message across the cluster, a NULL check is missing for clusterLink. clusterLink could be NULL if the link is causing memory beyond the set threshold cluster-link-sendbuf-limit and server terminates the link. This change introduces two things: Avoids the engine crashes on the publishing node if a message is tried to be sent to a node and the link is NULL. Adds a debugging tool CLUSTERLINK KILL to terminate the clusterLink between two nodes.
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