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fix(graceful_exit): adjust the destructing order #843
Merged
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See apache/incubator-pegasus#734 for coredump stack details.
The stack shows that we still want to enqueue some tasks when
task_worker_pool
is destroyed.This patch explicitly specified the order in which
service_app
,rpc_engine
andtask_engine
stop in~service_node()
, which is the reverese order they start.