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Benjamin Lerer commented on CASSANDRA-14793:
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The patch ensure that the data of the local system keyspaces is stored by
default within the first data directory (at the exception of the paxos table)
to allow the node to tolerate a failure of the disks associated with the other
directories.
The patch also allow users to configure a different directory for the system
keyspaces. This would allow people to use a disk providing redundancy to
support the lost of any of the disks used to store the data.
On startup existing system keyspace data will be automatically migrated to
support 4.0 upgrades or configuration changes (use of a separate disk for the
system keyspaces).
> Improve system table handling when losing a disk when using JBOD
> ----------------------------------------------------------------
>
> Key: CASSANDRA-14793
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14793
> Project: Cassandra
> Issue Type: Bug
> Components: Legacy/Core
> Reporter: Marcus Eriksson
> Assignee: Benjamin Lerer
> Priority: Normal
> Fix For: 4.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> We should improve the way we handle disk failures when losing a disk in a
> JBOD setup
> One way could be to pin the system tables to a special data directory.
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