release/v1.2: fix(ServeTask): Return error if server is not ready (#6019) #6022
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The grpcWorker.ServeTask function is called when a request is received
over the network (sent by a peer). This function doesn't consider the
health of the node before starting the processing of the request. If we
process a request before the node is ready, we might end up seeing
crashes similar to https://dgraph.atlassian.net/browse/DGRAPH-1934
Fixes DGRAPH-1934
This bug was seen when running Jepsen bank test with
kill-alpha and kill-zero nemesis.
(cherry picked from commit 9293c97)
This change is
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