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osd: Perform shard look up correctly in partial EC writes#66453

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NitzanMordhai merged 1 commit intoceph:mainfrom
aainscow:lrc_fix
Dec 3, 2025
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osd: Perform shard look up correctly in partial EC writes#66453
NitzanMordhai merged 1 commit intoceph:mainfrom
aainscow:lrc_fix

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@aainscow aainscow commented Nov 28, 2025

Plugins are permitted to provide a mapping to change the order in which OSDs are used. In practice only LRC does this and it is not currently enabled with optimisations, so this is a theoretical bug.

The bug here was that the "first" shard was assumed to be shard_id_t(0). However, this is not true for LRC.

Fixes: https://tracker.ceph.com/issues/74016

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@aainscow aainscow requested a review from a team as a code owner November 28, 2025 14:33
@github-actions github-actions bot added the core label Nov 28, 2025
Plugins are permitted to provide a mapping to change the order in which OSDs
are used. In practice only LRC does this and it is not currently enabled
with optimisations, so this is a theoretical bug.

The bug here was that the "first" shard was assumed to be shard_id_t(0).  However,
this is not true for LRC.

Fixes: https://tracker.ceph.com/issues/74016

Signed-off-by: Alex Ainscow <aainscow@uk.ibm.com>
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@NitzanMordhai NitzanMordhai merged commit 892986e into ceph:main Dec 3, 2025
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github-actions bot commented Dec 3, 2025

This is an automated message by src/script/redmine-upkeep.py.

I have resolved the following tracker ticket due to the merge of this PR:

No backports are pending for the ticket. If this is incorrect, please update the tracker
ticket and reset to Pending Backport state.

Update Log: https://github.com/ceph/ceph/actions/runs/19889706236

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5 participants