counter will replicate to all replicas during write regardless the
consistency level
I that the normal behavior or a bug ?
2013/6/11 Daning Wang dan...@netseer.com
It is counter caused the problem. counter will replicate to all replicas
during write regardless the consistency level.
In our
It is the normal behavior, but that's true of any update, not only of
counters.
The consistency level does *not* influence which replica are written to.
Cassandra always write to all replicas. The consistency level only decides
how replica acknowledgement are waited for.
--
Sylvain
On Wed, Jun
The consistency level does *not* influence which replica are written to.
Cassandra always write to all replicas.
I am aware of this.
My understanding of what Daning said was that client waited for all nodes
to acknowledge the write before considering it successful (inducing extra
latency) for
Is there something special of this kind regarding counters over multiDC ?
No. Counters behave exactly as other writes as far the consistency level is
concerned.
Technically, the counter write path is different from the normal write path
in the sense that a counter write
will be written to one
Crystal clear, we use a lot of counters and I am always happy to learn this
kind of things.
Thanks a lot.
Alain
2013/6/12 Sylvain Lebresne sylv...@datastax.com
Is there something special of this kind regarding counters over multiDC ?
No. Counters behave exactly as other writes as far the
Sorry for the confusion.
Sylvain - Do you think what could cause the client higher latency in
multiDC(CL=one for read and write) ? clients only connect to nodes in the
same DC. we did see the performance greatly improved after changing the
replication factor for counters, but still slower than
It is counter caused the problem. counter will replicate to all replicas
during write regardless the consistency level.
In our case. we don't need to sync the counter across the center. so moving
counter to new keyspace and all the replica in one center solved problem.
There is option
I am seeing the similar behavior, in my case I have 2 nodes in each
datacenter and one node always has high latency (equal to the latency
between the two datacenters). When one of the datacenters is shutdown the
latency drops.
I am curious to know whether anyone else has these issues and if yes
