with C# you need to be sure to tell thrift to use client-side buffering. http://wiki.apache.org/cassandra/ThriftExamples#C.23 shows this (but didn't until recently)
On Mon, May 24, 2010 at 4:09 PM, Carlos Alvarez <cbalva...@gmail.com> wrote: > I have the same issue in my cluster: 0,5% of requests are extremely > slow because the time it takes to read the data from the socket. > > However in my case it is not related to the load. Actually the > percentage of anomalies drop as the load increases. > > On the other hand the nio is actually slow than blocking io when you > have enough resources to handle all connections (which is my situation > in the server). > > I tend to blame the client and my unoptimized client connection scheme > ( c# client) which opens a lot of sockets and doenst pool at all. > > I am currently pinpointing this issue. I will let you know if find something. > > > Carlos.e > > > On 5/22/10, Даниел Симеонов <dsimeo...@gmail.com> wrote: >> Hi Jonathan, >> This sounds a little bit strange, I would expect that NIO server sockets >> to be more scalable than regular socket, well I don't have much experience >> with tcp programming. What was the scenario you used? The problem I observe >> is that most of the requests to Cassandra are quite performant (lets say >> miliseconds) yet some requests (~ 0.2 % of all requests) are slow ~2-5 >> seconds. Profiling Cassandra showed that thrift socket read operations >> contributed for most of the time spent. >> Best regards, Daniel. >> >> 2010/5/22 Jonathan Ellis <jbel...@gmail.com> >> >>> Because when we tested it, it was slower. >>> >>> 2010/5/21 Даниел Симеонов <dsimeo...@gmail.com>: >>> > Hi, >>> > I have a question about the thrift protocol used to connect to >>> Cassandra, >>> > I saw in class CassandraDaemon that TServerSocket is being used, >>> > why TNonblockingServerSocket is not being used? Thank you very much! >>> > Best regards, Daniel. >>> >>> >>> >>> -- >>> Jonathan Ellis >>> Project Chair, Apache Cassandra >>> co-founder of Riptano, the source for professional Cassandra support >>> http://riptano.com >>> >> > > -- > Sent from my mobile device > > Tal vez hubo un error en la grafía. O en la articulación del Sacro Nombre. > -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com
