Ethan Rose created HDDS-6577:
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Summary: Configurations to reserve HDDS volume space are not
followed
Key: HDDS-6577
URL: https://issues.apache.org/jira/browse/HDDS-6577
Project: Apache Ozone
Issue Type: Bug
Components: Ozone Datanode, SCM
Reporter: Ethan Rose
Ozone currently has two configuration keys that can be used to prevent datanode
volumes from being completely filled up:
hdds.datanode.du.reserved: A list of key-value pairs mapping each volume's path
to a fixed size that should be left empty on the volume. There is no default
value.
hdds.datanode.storage.utilization.critical.threshold: A percentage of each
datanode volume that should be left empty. The default value is 95%.
In a live cluster, we have seen volumes fill up past the default 95% value. In
a docker based test using a fixed size tmpfs volume mount, the configs also did
not seem to be respected. It is also unclear how the configs are reconciled if
configured with conflicting values. This Jira aims to provide a reliable way to
limit datanode volume usage, and add tests to simulate fixed capacity disks for
testing the functionality.
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