A _find request can run for a very long time (on large databases when the
selector matches no index) and this continues even if the client disconnects.
We want to stop the fabric work when there is no client to receive the
result. fabric_streams already kills the workers if the coordinating process
dies but in this circumstance it does not.
this commit enhances (and renames) the existing cleanup process to be a watchdog. If
enabled, the watchdog needs to be kicked regularly (by whatever activity we
think indicates its worth continuing) or it will terminate the process it is
watching, and kill the worker processes also.
Currently only mango_httpd:handle_find_req enables the watchdog and it only
kicks the watchdog when it enqueues a row to be returned (i.e, only on selector
matches).
2 files changed
