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https://issues.apache.org/jira/browse/CASSANDRA-14084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16272977#comment-16272977
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Paulo Motta commented on CASSANDRA-14084:
-----------------------------------------
This situation is reproduced by [this
dest|https://github.com/pauloricardomg/cassandra-dtest/commit/1b96dfd855d1b2fc10cbb4cf2e4c95d236ecd951#diff-1ef92939c7765f8c4041bada71208eebR51].
The simple fix is to use normal tokens for replacement nodes with the same
address:
* [3.11|https://github.com/pauloricardomg/cassandra/tree/3.11-14084]
CI looked clean when this was in CASSANDRA-13948, but I will submit again just
to make sure this will not cause problems when committed separately.
> 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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