Bug #39968: [journal] add support for aligned appends - rbd - Ceph

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Bug #39968

closed

[journal] add support for aligned appends

Added by Jason Dillaman almost 5 years ago. Updated almost 5 years ago.

Status:

Resolved

Priority:

Normal

Assignee:

Mykola Golub

Target version:

% Done:

Source:

Tags:

Backport:

Regression:

Severity:

3 - minor

Reviewed:

Affected Versions:

ceph-qa-suite:

Pull request ID:

28351

Crash signature (v1):

Crash signature (v2):

Description

Journal entries are normally appended to the the end of the journal object. Unaligned appends can result in between 2 - 3 writes within bluestore (depending on the append size and min alloc size). One potential solution would be to support a new "journal::append" cls method that could automatically re-align the write based on the current journal size. This would also require supporting a new "pad" journal event that can skip X number of bytes in the replay stream.