Hi Val, Keeping session forever is not good cause it consumes resources on server and client side as well. On the client for example you have bunch of Netty threads.
I think if you just specify session expiration timeout to some big value (1 day for example) it should be far enough. Igor On Wed, Apr 12, 2017 at 12:01 PM, Valentin Kulichenko < valentin.kuliche...@gmail.com> wrote: > Igor, > > Thanks! I'm a bit in a rush with this, so already created a ticket [1] and > assigned it to myself if you don't mind :) > > One more question though. Why exactly keeping sessions "forever" is bad? I > expect store operations to happen while node is up, and currently if there > is a pause larger than 5 minutes between consequent operations, I have to > reopen connection which causes slowdown. I'm not sure what is the benefit > of this and what are we trying to solve with this. Can you please clarify? > > [1] https://issues.apache.org/jira/browse/IGNITE-4954 > > -Val > > On Wed, Apr 12, 2017 at 5:47 PM, Igor Rudyak <irud...@gmail.com> wrote: > >> Hi Val, >> >> 1) The genral idea is to have a session pool, cause closing and reopening >> Cassandra session each time is rather expensive operation. >> >> 2) I can easily add session expiration timeout as a parameter for >> Cassandra store. Will create a ticket for this. >> >> 3) It could be easily implemented ether, by closing and reopening session >> every time or just keeping opened sessions forever, but both approaches are >> bad. It's better to have a session pool and specify rather long session >> expiration timeout. >> >> Igor >> >> >> >> On Apr 12, 2017 2:48 AM, "Valentin Kulichenko" < >> valentin.kuliche...@gmail.com> wrote: >> >> Hi Igor, >> >> I recently faced an issue with Cassandra store closing idle connections >> after some time. While investigating I found that this is caused by >> SessionPool and its SessionMonitor thread which closes sessions that were >> not acquired from the pool within 5 minutes. >> >> I have several questions regarding this: >> >> - What is the general idea behind this? >> - Why the timeout is not configurable? >> - Is it possible to add an option to disable this thread completely? >> Will this have any drawbacks? >> >> -Val >> >> >> >
