Paulo Motta created CASSANDRA-14084:
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Summary: Disks can be imbalanced during replace of same address
when using JBOD
Key: CASSANDRA-14084
URL: https://issues.apache.org/jira/browse/CASSANDRA-14084
Project: Cassandra
Issue Type: Bug
Reporter: Paulo Motta
Assignee: Paulo Motta
While investigating CASSANDRA-14083, I noticed that [we use the pending ranges
to calculate the disk
boundaries|https://github.com/apache/cassandra/blob/41904684bb5509595d11f008d0851c7ce625e020/src/java/org/apache/cassandra/db/DiskBoundaryManager.java#L91]
when the node is bootstrapping.
The problem is that when the node is replacing a node with the same address, it
[sets itself as normal
locally|https://github.com/apache/cassandra/blob/41904684bb5509595d11f008d0851c7ce625e020/src/java/org/apache/cassandra/service/StorageService.java#L1449]
(for other unrelated reasons), so the local ranges will be null and
consequently the disk boundaries will be null. This will cause the sstables to
be randomly spread across disks potentially causing imbalance.
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