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Zach Brown fb7e43dd23 v1.4 Release

Finish the release notes for the 1.4 release.

Signed-off-by: Zach Brown <zab@versity.com>

2022-05-06 09:57:27 -07:00

Versity ScoutFS Release Notes

v1.4
May 6, 2022

Fix possible client crash during server failover
Fixed a narrow window during server failover and lock recovery that could cause a client mount to believe that it had an inconsistent item cache and panic. This required very specific lock state and messaging patterns between multiple mounts and multiple servers which made it unlikely to occur in the field.

v1.3
Apr 7, 2022

Fix rare server instability under heavy load
Fixed a case of server instability under heavy load due to concurrent work fully exhausting metadata block allocation pools reserved for a single server transaction. This would cause brief interruption as the server shutdown and the next server started up and made progress as pending work was retried.
Fix slow fencing preventing server startup
If a server had to process many fence requests with a slow fencing mechanism it could be interrupted before it finished. The server now makes sure heartbeat messages are sent while it is making progress on fencing requests so that other quorum members don't interrupt the process.
Performance improvement in getxattr and setxattr
Kernel allocation patterns in the getxattr and setxattr implementations were causing significant contention between CPUs. Their allocation strategy was changed so that concurrent tasks can call these xattr methods without degrading performance.

v1.2
Mar 14, 2022

Fix deadlock between fallocate() and read() system calls
Fixed a lock inversion that could cause two tasks to deadlock if they performed fallocate() and read() on a file at the same time. The deadlock was uninterruptible so the machine needed to be rebooted. This was relatively rare as fallocate() is usually used to prepare files before they're used.
Fix instability from heavy file deletion workloads
Fixed rare circumstances under which background file deletion cleanup tasks could try to delete a file while it is being deleted by another task. Heavy load across multiple nodes, either many files being deleted or large files being deleted, increased the chances of this happening. Heavy staging could cause this problem because staging can create many internal temporary files that need to be deleted.

v1.1
Feb 4, 2022

Add scoutfs(1) change-quorum-config command
Add a change-quorum-config command to scoutfs(1) to change the quorum configuration stored in the metadata device while the file system is unmounted. This can be used to change the mounts that will participate in quorum and the IP addresses they use.
Fix Rare Risk of Item Cache Corruption
Code review found a rare potential source of item cache corruption. If this happened it would look as though deleted parts of the filesystem returned, but only at the time they were deleted. Old deleted items are not affected. This problem only affected the item cache, never persistent storage. Unmounting and remounting would drop the bad item cache and resync it with the correct persistent data.

v1.0
Nov 8, 2021