New features:
- Implement [client writeback cache](docs/config/client.en.md#client_enable_writeback)
- Add the third I/O mode: [O_DIRECT|O_SYNC](docs/config/osd.en.md#data_io) (good for Optane)
- Reduce load on etcd by splitting OSD lease and statistics reporting intervals:
[etcd_stats_interval](docs/config/osd.en.md#etcd_stats_interval) (default 30 sec)
- Make MON automatically filter OSDs by layout (block_size/immediate_commit/bitmap_granularity)
to prevent "refusing to start PGs of this pool" errors on misconfiguration
- Support running fio benchmarks on systems without io_uring
- Make QEMU driver compatible with QEMU 8.1
- Document usage of [vhost-user-blk](docs/usage/qemu.en.md#vhost-user-blk)
Bug fixes:
- Fix resizing disks in QEMU driver (for example, in Proxmox)
- Fix "unexpected result" in Proxmox driver by making CLI flush output on exit
- Remove unneeded block_size mismatch warnings on pools without matching PGs
- Fix possible segfault in vitastor-cli ls -l (usually with deleted pools)
- Fix QEMU driver compatibility with systems without io_uring
- Fix monitor eating 100% CPU when etcd is down (caused by infinite retries)
- Fix potential incorrect write processing with snapshots (not caught in tests
but could probably lead to client hangs)
- Fix buffer insertion in cluster_client (not caught in tests but could
probably lead to incorrect writes in rare cases)
- Fix rare OSD crash during sync operation processing
- Fix a reenterability issue in cluster_client not reproducible in QEMU/fio,
but reproducible with the currently developed K/V database implementation
- Fix deletion of the first modified object - OSDs could crash if you modified
the same object a lot of times, then deleted it, and then modified it again
- Fix the fio_sec_osd test tool
- Disabled by default, enable with client_enable_writeback=true
- Even then only enabled in FIO when -direct is disabled and in QEMU when
block device cache is enabled in settings
- Can also be enabled in other clients like vitastor-cli using parameter
client_writeback_allowed=true, but not recommended
New features:
- Data and metadata checksums!
- Metadata checksums are always used with new disk format
- Data checksums can be turned on with --data_csum_type crc32c for new OSDs
- Checksum block size can be configured
- inmemory_metadata now also affects keeping checksums in memory
- Linux page cache I/O caching support which can be enabled separately for
data, metadata (including checksums) and journal (O_SYNC instead of O_DIRECT)
- Details [here](https://git.yourcmc.ru/vitalif/vitastor/src/branch/master/docs/config/layout-osd.en.md#data_csum_type)
- Backwards compatibility is preserved, you can use new OSDs with old disks
Release also includes bug fixes from [0.9.6](https://git.yourcmc.ru/vitalif/vitastor/releases/tag/v0.9.6).
0.9.6 is moved to "-oldstable" repositories and will be available for some additional time.
Instead of it, just do not verify checksums of currently mutated objects.
When clean data modification during flush runs in parallel to a read request,
that request may read a mix of old and new data. It may even read a mix of
multiple flushed versions if it lasts too long... And attempts to verify it
using temporary copies of metadata make the algorithm too complex and creepy.
- Fix vitastor-disk partition zeroing (sometimes it was writing garbage instead of zeroes)
- Fix incorrect EC space statistics in `vitastor-cli status`
- Several bug fixes for NFS:
- Add . and .. in NFS directory listings
- Return FILE_SYNC from NFS writes if immediate_commit is enabled
- Return the same "verifier" in NFS COMMIT as in NFS WRITE
- Make parallel NFS extending writes work correctly, without conflicts
- Handle parallel NFS extending writes without imposing extra load on etcd
- Support UTF-8 in vitastor-cli table output
- Also allow "0" and "no" as false for inmemory_metadata and inmemory_journal
- Use HDD defaults for HDD-only in automatic `vitastor-disk prepare` mode
This fixes buffered (not O_DIRECT) NFS writes in Linux - previously they were
hanging in an infinite loop because COMMIT didn't return the same verifier as
previous WRITEs, and NFS kernel client was infinitely retrying the same writes.
Also this probably allows for correct NFS failover, at least for the same
buffered writes, because NFS clients repeat all write requests until a COMMIT
confirms them.
Previously, multiple parallel writes extending file size through NFS were
racing with each other and triggering deletions of part of the written data
I.e. if you mounted vitastor-nfs and just copied a file into it in MC then
you could end up with only a part of the file actually written
- Improve QEMU driver performance by integrating io_uring in it (up to 1.5x total iops improvement)
- Fix QEMU driver deadlocks which started to reproduce in qemu-img after iothread fixes
- Fix `vitastor-cli status` reporting more etcds than actually exists (fix etcd address duplication in config on reload)
- Fix `vitastor-cli ls` crashing on inodes in non-existing pools
- Delete old garbage /pool/stats/ keys for non-existing (deleted) pools
- Reduce memory usage of etcds initialized by make-etcd script
- Fix OSDs almost always crashing on etcd restart due to "revisions were compacted" (support reloading state from etcd)
- Fix a crash and a stall possible mostly in HDD setups with small journal and big (512k, 900k) random writes
- Add notes about HDDs to documentation. You are officially allowed to use HDD-only Vitastor with HGST/Toshiba/EXOS :)
Deadlock was caused by switching QEMU coroutines directly inside
vitastor_co_read_bitmap_cb() callback. The correct way is to schedule a BH
/BH is a QEMU term for setImmediate() :)/, same as in read and write callbacks.
Fixes two bugs found during HDD testing :-)
1) OSD crashed with "BUG: Attempt to overwrite used offset of the journal" during
`fio -bs=900k -iodepth=128` test with 16 MB journal
2) OSD stalled during `fio -bs=512k -iodepth=128` test with 64 MB journal
Before this change, OSDs almost always died when one of the etcds was restarted,
even though the rest of them was still in quorum and the lease was still active
Vitaliy Filippov