Hi Aljoscha, Ufuk Thank you for the replies.
I'm using RocksDB state backend. Could you please explain the blocking I/O calls mentioned? when will it happen? And what will be the effect? A timeout exception? Best Ziyad On Mon, Aug 14, 2017 at 10:17 PM, Ufuk Celebi <u...@apache.org> wrote: > This is as Aljoscha describes. Each thread can handle many different > clients at the same time. You shouldn't need to change the defaults in > most cases. > > The network threads handle the TCP connections and dispatch query > tasks to the query threads which do the actual querying of the state > backend. In case of the RocksDB backend for example this might involve > blocking I/O calls. > > – Ufuk > > On Mon, Aug 14, 2017 at 12:35 PM, Aljoscha Krettek <aljos...@apache.org> > wrote: > > Hi, > > > > I think the number of network treads and number of query threads only > > roughly correlate with the number of clients that can query in parallel > > since this is using asynchronous communication via Akka/Netty. Of course, > > increasing that number means there can be more connections but I think > even > > just 1 Thread or each of those should be able to easily handle multiple > > queries at the same time. > > > > I'm cc'ing Ufuk and Kostas who might know more about this. > > > > Best, > > Aljoscha > > > > On 9. Aug 2017, at 17:19, Ziyad Muhammed <mmzi...@gmail.com> wrote: > > > > Hi all, > > > > I'm trying to understand how many parallel clients will be supported by > the > > queryable state. > > > > query.server.network-threads: number of network (event loop) threads for > the > > KvStateServer (0 => #slots) > > query.server.query-threads: number of asynchronous query threads for the > > KvStateServerHandler (0 => #slots). > > > > so, if I choose 0 for both these parameters, what will be the maximum > number > > of parallel clients supported? > > > > I tried more parallel clients than number of slots, but all of them were > > able to query the state in parallel. Can someone help me to understand > the > > logic here? > > > > Thanks in advance. > > > > Best > > Ziyad > > > > >
