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sbernauer committed Sep 21, 2023
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You can configure Pod disruptions for HDFS nodes as described in xref:concepts:operations/pod_disruptions.adoc[].

Unless you configure something else or disable our PodDisruptionBudgets (PDBs), we write the following PodDisruptionBudgets:
Unless you configure something else or disable our PodDisruptionBudgets (PDBs), we write the following PDBs:

== Journalnodes
We only allow a single journalnode to be offline at a given time, regardless of the number of replicas or roleGroups.
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We only allow a single namenode to be offline at a given time, regardless of the number of replicas or roleGroups.

== Datanode
For datanodes the questions how many instances can be offline at the same time is a bit harder.

HDFS stores you in blocks on the datanodes.
For datanodes the questions how many instances can be offline at the same time is a bit harder:
HDFS stores your in blocks on the datanodes.
Every block can be replicated multiple times (to multiple datanodes) to ensure maximum availability.
The default setting is a replication of `3` - which can be configured using `spec.clusterConfig.dfsReplication`. However, it is also possible to change the replication factor for a specific file or directory to something else than the cluster default.

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