osd/bluestore: Actually wait until completion in write_sync#26868
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vitalif wants to merge 1 commit intoceph:mimicfrom
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osd/bluestore: Actually wait until completion in write_sync#26868vitalif wants to merge 1 commit intoceph:mimicfrom
vitalif wants to merge 1 commit intoceph:mimicfrom
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This function is only used by RocksDB WAL writing so it must sync data. This fixes ceph#18338 and thus allows to actually set `bluefs_preextend_wal_files` to true, gaining +100% single-thread write iops in disk-bound (HDD or bad SSD) setups. To my knowledge it doesn't hurt performance in other cases. Test it yourself on any HDD with `fio -ioengine=rbd -direct=1 -bs=4k -iodepth=1`. Issue ceph#18338 is easily reproduced without this patch by issuing a `kill -9` to the OSD while doing `fio -ioengine=rbd -direct=1 -bs=4M -iodepth=16`. Fixes: https://tracker.ceph.com/issues/18338 https://tracker.ceph.com/issues/38559 Signed-off-by: Vitaliy Filippov <vitalif@yourcmc.ru>
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Please don't open backport PRs until the fix has merged to master and the appropriate backport tickets exist. :) |
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This function is only used by RocksDB WAL writing so it must sync data.
This fixes #18338 and thus allows to actually set
bluefs_preextend_wal_filesto true, gaining +100% single-thread write iops in disk-bound (HDD or bad SSD) setups. To my knowledge it doesn't hurt performance in other cases. Test it yourself on any HDD withfio -ioengine=rbd -direct=1 -bs=4k -iodepth=1.Issue #18338 is easily reproduced without this patch by issuing a
kill -9to the OSD while doingfio -ioengine=rbd -direct=1 -bs=4M -iodepth=16.Fixes: https://tracker.ceph.com/issues/18338 https://tracker.ceph.com/issues/38559