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RabbitMQ Supervisor Structure

rabbit_sup

Global supervisor started after the rabbit app has started.

|
--- rabbit_node_monitor_sup
|    |
|    --- rabbit_node_monitor
|       Notifies other nodes in the clusters about its own node presence.
|       Takes cares of the situation when other node dies.
|
--- msg_store_transient
|   |
|   --- rabbit_msg_store
|
--- msg_store_persistent
|   |
|   --- rabbit_msg_store
|       Both handle the message storage.
|
--- rabbit_tcp_client_sup
|   See drawing on paper.
|   Started during the networking boot step. See rabbit_networking:start/0
|
--- rabbit_direct_client_sup
|   Started during the direct_client boot step. See rabbit_direct:boot/0
|
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--- tcp_listener_sup <--- not registered. 
    This supervisor structure is repeated for each network interface on which RabbitMQ listens too
|   |
|   --- tcp_acceptor_sup_IP:PORT
|   |    |
|   |    --- tcp_acceptor
|   |
|   --- tcp_listener
|
--- rabbit_amqqueue_sup
|   |
|   --- rabbit_amqqueue_process  <- one child per queue?
|
--- rabbit_mirror_queue_slave_sup
|   |
|   --- rabbit_mirror_queue_slave <-- one child per queue? Used for HA queues.
|
--- rabbit_guid_sup
|   |
|   --- rabbit_guid     
|       Globally Unique Identifier server.
|
--- rabbit_memory_monitor_sup
|   |
|   --- rabbit_memory_monitor
|       Monitors queues memory usage.
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--- delegate_sup <-- instance of rabbit_sup.erl
|   |
|   --- delegate_x <-- x goes 0-15 according to app config argument: delegate_count. 
        Used to parallelize calls to processes. 
        For example when routing messages, the delegates take care of sending the messages 
        to each of the queues that ought to receive the message.
|
--- rabbit_registry
|   Keeps a registry of plugins and their modules. 
    For example it maps authentication mechanisms to modules with the actual implementation. 
    The same thing is done from exchange type to exchange type implementation.
|
--- rabit_log_sup
|   |
|   --- rabbit_log
|        Delegates logging calls to the native error_logger module.
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--- vm_memory_monitor_sup
|   |
|   --- vm_memory_monitor
|        Monitors Erlang's memory usage to prevent it from crashing or swapping.
|
--- rabbit_event_sup
|   |
|   --- rabbit_event
|        Handles event notification for statistics collection. 
         For example when a new channel is created, then a notification like: 
         `rabbit_event:notify(channel_created, infos(?CREATION_EVENT_KEYS, State))` is fired.
|
--- file_handle_cache_sup <-- instance of rabbit_sup.erl
|   |
|   --- file_handle_cache
|       Manages file handles to synchronize reads and writes to them. 
        See `file_handle_cache.erl` for an in depth explanation of its purpose.
|
--- worker_pool_sup <-- instance of rabbit_sup.erl
    |
    --- worker_pool
    |
    --- worker_pool_worker
    The worker pool process manages a pool of up to `N` number of workers 
    where `N` is the return of `erlang:system_info(schedulers)`. Used to parallelize function calls.