How to properly close a connection? (But not the driver)

[Kaizah Kaiser]

I am trying to simply close a connection but keep the driver intact (because I want to reuse it to connect again later to a different replica set). Doing so gives me all sorts of dead letters.

What I am doing:

val driver = new MongoDriver()

val conn = driver.connection

val conn = driver.connection(List("localhost"))

conn.close

But when the connection is closed, I get all these (limited to 10):

[INFO] [08/02/2016 15:45:42.233] [reactivemongo-akka.actor.default-dispatcher-2] [akka://reactivemongo/deadLetters] Message [reactivemongo.core.actors.Closed$] from Actor[ak

ka://reactivemongo/user/Monitor-Connection-2#-435832937] to Actor[akka://reactivemongo/deadLetters] was not delivered. [1] dead letters encountered. This logging can be turned off

or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.

[INFO] [08/02/2016 15:45:42.233] [reactivemongo-akka.actor.default-dispatcher-2] [akka://reactivemongo/user/Connection-2] Message [reactivemongo.core.actors.ChannelDisconnected] fr

om Actor[akka://reactivemongo/deadLetters] to Actor[akka://reactivemongo/user/Connection-2#-1358334014] was not delivered. [2] dead letters encountered. This logging can be turned

off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.

[INFO] [08/02/2016 15:45:42.233] [reactivemongo-akka.actor.default-dispatcher-2] [akka://reactivemongo/user/Connection-2] Message [reactivemongo.core.actors.ChannelClosed] from Act

or[akka://reactivemongo/deadLetters] to Actor[akka://reactivemongo/user/Connection-2#-1358334014] was not delivered. [3] dead letters encountered. This logging can be turned off or

 adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.

[INFO] [08/02/2016 15:45:42.233] [reactivemongo-akka.actor.default-dispatcher-2] [akka://reactivemongo/user/Connection-2] Message [reactivemongo.core.actors.ChannelDisconnected] fr

om Actor[akka://reactivemongo/deadLetters] to Actor[akka://reactivemongo/user/Connection-2#-1358334014] was not delivered. [4] dead letters encountered. This logging can be turned

off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.

[INFO] [08/02/2016 15:45:42.233] [reactivemongo-akka.actor.default-dispatcher-2] [akka://reactivemongo/user/Connection-2] Message [reactivemongo.core.actors.ChannelClosed] from Act

or[akka://reactivemongo/deadLetters] to Actor[akka://reactivemongo/user/Connection-2#-1358334014] was not delivered. [5] dead letters encountered. This logging can be turned off or

 adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.

[INFO] [08/02/2016 15:45:42.234] [reactivemongo-akka.actor.default-dispatcher-2] [akka://reactivemongo/user/Connection-2] Message [reactivemongo.core.actors.ChannelDisconnected] fr

om Actor[akka://reactivemongo/deadLetters] to Actor[akka://reactivemongo/user/Connection-2#-1358334014] was not delivered. [6] dead letters encountered. This logging can be turned

off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.

[INFO] [08/02/2016 15:45:42.234] [reactivemongo-akka.actor.default-dispatcher-2] [akka://reactivemongo/user/Connection-2] Message [reactivemongo.core.actors.ChannelClosed] from Act

or[akka://reactivemongo/deadLetters] to Actor[akka://reactivemongo/user/Connection-2#-1358334014] was not delivered. [7] dead letters encountered. This logging can be turned off or

 adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.

[INFO] [08/02/2016 15:45:42.234] [reactivemongo-akka.actor.default-dispatcher-2] [akka://reactivemongo/user/Connection-2] Message [reactivemongo.core.actors.ChannelDisconnected] fr

om Actor[akka://reactivemongo/deadLetters] to Actor[akka://reactivemongo/user/Connection-2#-1358334014] was not delivered. [8] dead letters encountered. This logging can be turned

off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.

[INFO] [08/02/2016 15:45:42.234] [reactivemongo-akka.actor.default-dispatcher-2] [akka://reactivemongo/user/Connection-2] Message [reactivemongo.core.actors.ChannelClosed] from Act

or[akka://reactivemongo/deadLetters] to Actor[akka://reactivemongo/user/Connection-2#-1358334014] was not delivered. [9] dead letters encountered. This logging can be turned off or

 adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.

[INFO] [08/02/2016 15:45:42.234] [reactivemongo-akka.actor.default-dispatcher-2] [akka://reactivemongo/user/Connection-2] Message [reactivemongo.core.actors.ChannelDisconnected] fr

om Actor[akka://reactivemongo/deadLetters] to Actor[akka://reactivemongo/user/Connection-2#-1358334014] was not delivered. [10] dead letters encountered, no more dead letters will

be logged. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.

[Cédric Chantepie]

Hi,

There is a misunderstanding. As indicated in the documentation, a MongoConnection stands for a logical connection, aka a pool of network channel.
So usually, there is only one instance (as for the MongoDriver) per application lifecycle.

Best regards

[Kaizah Kaiser]

No, there is no misunderstanding - I understand this perfectly well. In my scenario however (be it as it may), I do need to be able to close connections. I can elaborately explain why, but for the sake of simplicity I won't. I just want to know how (and maybe IF) it is possible to do a proper closing of just a (logical) connection (and hence it's underlying physical connections).

Op dinsdag 2 augustus 2016 16:54:14 UTC+2 schreef Cédric Chantepie:

[Cédric Chantepie]

If you think you need to close a specific pool, that's indeed MongoConnection.close, the logging being normal (INFO level) as the coming requests go to the dead letters since the closed pool refused to process it.