> Further I need to understand that for internal read/write does cassandra uses > thrift for doing so over an rpc connection(port 9160) or 7000 as for inter > node communication.May be that also could be a reason for so many connections > on 9160. Uses 7000
> What I could see from Ganglia is high CPU load on this server and also number > of TCP connection on port 9160 is around 600+ all the time.The distribution > of these connections say that we have connections from this machine to other > DC machines are around 90 odd each. For port 7000 its around 45. Could these be hadoop tasks that are still running ? Cheers ----------------- Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 25/05/2012, at 4:51 PM, Shubham Srivastava wrote: > I have a multiDC ring with 6 nodes in each DC. > > I have a single node which runs some jobs (including Hadoop Map-Reduce with > PIG) every 15minutes. > > Lately there has been high CPU load and memory issues on this node. > > What I could see from Ganglia is high CPU load on this server and also number > of TCP connection on port 9160 is around 600+ all the time.The distribution > of these connections say that we have connections from this machine to other > DC machines are around 90 odd each. For port 7000 its around 45. > > Further I need to understand that for internal read/write does cassandra uses > thrift for doing so over an rpc connection(port 9160) or 7000 as for inter > node communication.May be that also could be a reason for so many connections > on 9160. > > I have an 8Core machine with 14Gb RAM and 8Gb Heap. > rpc min and max threads are default and so are the other rpc based properties > RF:3 each DC and Read/Write CL:1 and Read Repair Chance=0.1. > cassandra version is 0.8.6 > > Regards, > Shubham
