April 2018
Intermediate to advanced
468 pages
14h 34m
English
Content preview from Mastering Kubernetes - Second Edition
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Assigning pods to nodes
The main problem with the replication controller approach is that multiple pods can get scheduled on the same Kubernetes node. What if you have a replication factor of three and all three pods that are responsible for some range of the keyspace are all scheduled to the same Kubernetes node? First, all requests for read or writes of that range of keys will go to the same node, creating more pressure. But, even worse, we just lost our redundancy. We have a single point of failure (SPOF). If that node dies, the replication controller will happily start three new pods on some other Kubernetes node, but none of them will have data, and no other Cassandra node in the cluster (the other pods) will have data to copy from. ...
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