Pod placement

You can configure Pod placement for HDFS nodes as described in Pod Placement.

Default Pod placement constraints for master nodes:

affinity: podAffinity: preferredDuringSchedulingIgnoredDuringExecution: - podAffinityTerm: labelSelector: matchLabels: app.kubernetes.io/instance: cluster-name app.kubernetes.io/name: hbase topologyKey: kubernetes.io/hostname weight: 20 podAntiAffinity: preferredDuringSchedulingIgnoredDuringExecution: - podAffinityTerm: labelSelector: matchLabels: app.kubernetes.io/component: master app.kubernetes.io/instance: cluster-name app.kubernetes.io/name: hbase topologyKey: kubernetes.io/hostname weight: 70

Default Pod placement constraints for region server nodes:

affinity: podAffinity: preferredDuringSchedulingIgnoredDuringExecution: - podAffinityTerm: labelSelector: matchLabels: app.kubernetes.io/instance: cluster-name app.kubernetes.io/name: hbase topologyKey: kubernetes.io/hostname weight: 20 - podAffinityTerm: labelSelector: matchLabels: app.kubernetes.io/component: datanode app.kubernetes.io/instance: hdfs-cluster-name app.kubernetes.io/name: hdfs topologyKey: kubernetes.io/hostname weight: 50 podAntiAffinity: preferredDuringSchedulingIgnoredDuringExecution: - podAffinityTerm: labelSelector: matchLabels: app.kubernetes.io/component: regionserver app.kubernetes.io/instance: cluster-node app.kubernetes.io/name: hbase topologyKey: kubernetes.io/hostname weight: 70

Default Pod placement constraints for rest server nodes:

affinity: podAffinity: preferredDuringSchedulingIgnoredDuringExecution: - podAffinityTerm: labelSelector: matchLabels: app.kubernetes.io/instance: test-hbase app.kubernetes.io/name: hbase topologyKey: kubernetes.io/hostname weight: 20 podAntiAffinity: preferredDuringSchedulingIgnoredDuringExecution: - podAffinityTerm: labelSelector: matchLabels: app.kubernetes.io/component: restserver app.kubernetes.io/instance: test-hbase app.kubernetes.io/name: hbase topologyKey: kubernetes.io/hostname weight: 70

In the examples above cluster-name is the name of the HBase custom resource that owns this Pod. The hdfs-cluster-name is the name of the HDFS cluster that was configured in the hdfsConfigMapName property.

It is important that the hdfsConfigMapName property contains the name the HDFS cluster. You could instead configure ConfigMaps of specific name or data roles, but for the purpose of pod placement, this will lead to faulty behavior.