Hi,
Iam new to Akka, and have been designing an application in
akka(2.2.3)/scala. Gist of the application is to poll for files from
external source every minute, process the file (read) and send it for
downstream processing.
I have a master actor, that creates region pollers (the external source can
be located in multiple geo regions). The region pollers then polls for
files in the specific region and creates child actors that processes the
files.
Current mechanism-
1. MasterPoller created and scheduled periodically, by sending a message in
a Main
2. The MasterPoller actor creates the RegionPoller actor upon receiving the
message
3. The RegionPoller creates the FileWorker actors upon receiving the message
4. FileWorker processes the files.
First question, is this an acceptable pattern of creating actors within the
"receive" method. Or should it be created as part of the "preStart" of each
actor. Should I terminate the actors in step 3. and 2. after processing? Or
if I don't, will they be reused when the MasterPoller creates the actors
again? I fear that with the implementation I currently have, the number of
actors are going to be incremented with no explicit "stop". But what's the
performance impact of stopping the actors, and recreating them?
Secondly if I create the actors as part of "prestart" then they will be
reused. But in the case where FileWorker is processing, and then the
MasterPoller is scheduled for the next run, and sends a message to
RegionPoller. When RegionPoller sends the message to FileWorker, it's going
to be blocked, right?
Any suggestions on what the best practices are?
Regards,
Sridhar.
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