Fix harvester shutdown for prospector reloading (#3563) #3584
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* Fix harvester shutdown for prospector reloading There are two options for stopping a harvester or a prospector. Either the harvester and prospector finish sending all events and stop them self or they are killed because the output is blocking. In case of shutting down filebeat without using `shutdown_timeout` filebeat is expected to shut down as fast as possible. This means channels are directly closed and the events are not passed through to the registry. In case of dynamic prospector reloading, prospectors and harvesters must be stopped properly as otherwise no new harvester for the same file can be started. To make this possible the following changes were made: * Introduce harvester tracking in prospector to better control / manage the harvesters. The implementation is based on a harvester registry which starts and stops the harvesters * Use an outlet to send events from harvester to prospector. This outlet has an additional signal to have two options on when the outlet should be finished. Like this the outlet can be stopped by the harvester itself or globally through closing beatDone. * Introduce more done channels in prospector to make shutdown more fine grained * Add system tests to verify new behaviour Closes elastic#3546 * review added (cherry picked from commit 15b32e4)
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There are two options for stopping a harvester or a prospector. Either the harvester and prospector finish sending all events and stop them self or they are killed because the output is blocking.
In case of shutting down filebeat without using
shutdown_timeoutfilebeat is expected to shut down as fast as possible. This means channels are directly closed and the events are not passed through to the registry.In case of dynamic prospector reloading, prospectors and harvesters must be stopped properly as otherwise no new harvester for the same file can be started. To make this possible the following changes were made:
Closes #3546
(cherry picked from commit 15b32e4)