Hello,
Local quorum works in the same data center as the coordinator node, but
when an app server execute the write query, how is the coordinator node
chosen?
I use the node.js driver. How do the driver client determine which
cassandra nodes are in the same DC as the client node? Does it use
private network IP [192.168.x.x etc] to auto detect, or must I manually
provide a localBalancing policy by `new DCAwareRoundRobinPolicy(
localDcName )`?
If a partition is not available in the local DC, i.e. if the local
replica node fails or all replica nodes are in remote DC, will local
quorum fail? If it doesn't fail, there is no guarantee that it all
queries on a partition will be directed to the same data center, so does
it means strong consistency cannot be expected?
Another question:
Suppose I have replication factor 3. If one of the node fails, will
queries with ALL consistency fail if the queried partition is on the
failed node? Or would they continue to work with 2 replicas during the
time while cassandra is replicating the partitions on the failed node to
re-establish 3 replicas?
Thank you.
Regards,
X. F. Li
