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Multiple DataCenter Configuration but very slow write performance

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selvan
Member

I have two data center configuration (miami & culpepper). 3 nodes on each data center with the PropertyFileSnitch. and keyspace configuration as

Keyspace: demo1:
Replication Strategy: org.apache.cassandra.locator.NetworkTopologyStrategy
Durable Writes: true
Options: [culpepper:2, miami:2]

I am writing to miami data center (with LOCAL_QUORUM consistency level) and expected the rows replicated to both data centers and it does. The problem is that slow performance. It is taking about 4 seconds to write 100 records to the demo1 keyspace with above keyspace configuration.

I created an another keyspace demo2 like this

Keyspace: demo2:
Replication Strategy: org.apache.cassandra.locator.NetworkTopologyStrategy
Durable Writes: true
Options: [miami:2]

And writing 100 rows takes only about 150 milliseconds.

Any suggestions what is going on? I was expecting asynchronous replication between data centers.

Thanks
/selvan

Posted 10 months ago #
selvan
Member

Answering my own question ;)

Found the reason why the write was slow. The way of passing the consistency level through hector was incorrect and after I corrected that, the performance was pretty good.

Posted 10 months ago #