Dynamic Snitch does not compute scores if no direct reads hit the node.
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Key: CASSANDRA-3640
URL: https://issues.apache.org/jira/browse/CASSANDRA-3640
Project: Cassandra
Issue Type: Bug
Reporter: Edward Capriolo
Priority: Minor
We can into an interesting situation. We added 2 nodes to our cluster.
Strangely this node performed worse then other nodes. It had more IOwait for
example. The impact was not major but it was noticeable. Later I determined
that this Cassandra node was not in our client's list of nodes and our clients
do not auto discover. I confirmed that the host did not have any scores inside
it's dynamic snitch.
It is counter intuitive that a node receiving less or no direct user requests
would perform worse then others. I am not sure of the dynamic that caused this.
I understand that DSnitch is supposed to have it's own view of the world, maybe
it could share information with neighbours. Again this is more of a client
configuration issue then a direct Cassandra issue, but I found it quite
interesting.
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