Question about Number of Thrift Connections

Kevin Mendel

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Mar 21, 2016, 4:53:34 PM3/21/16

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When MAX_CASSANDRA_CONNECTIONS=128, netstat shows 257 ESTABLISHED connections on port 9160.

When MAX_CASSANDRA_CONNECTIONS=160, netstat shows 321.

Can anyone explain?

Vinny Ly

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Mar 21, 2016, 6:19:49 PM3/21/16

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I think the x2 is because you have one connection for read and one for write per thread (see AstyanaxReader/AstyanaxWriter).

for the +1, do you have an extra client running something that's connecting to cassandra? like cqlsh?

I am assuming port 9160 is for your cassandra connections.

Kevin Mendel

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Mar 21, 2016, 6:36:50 PM3/21/16

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I really just want to know if the number of TCP connections should be 2 X MAX_CASSANDRA_CONNECTIONS.

You seem to be saying it is, and that it's an Astyanax thing. So thanks for confirming.

The 1 odd one I am not worried about. But I did have cqlsh running. So I exited, but it didn't go away. cqlsh wouldn't be using thrift anyway, I think.

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