Massive directory metadata operation performance decrease (LU-14146)

[LU-15528] downgrade remote PW/EX lock taken in distributed transactions to COS mode Created: 07/Feb/22  Updated: 27/Apr/22

Status: Open
Project: Lustre
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Technical task Priority: Minor
Reporter: Lai Siyao Assignee: WC Triage
Resolution: Unresolved Votes: 0
Labels: None

Issue Links:
Related
is related to LU-14761 DNE2 Metadata degradation Open
Rank (Obsolete): 9223372036854775807

 Description   

downgrade remote PW/EX lock taken in distributed transactions to COS mode asynchronously after transaction stop, this can avoid commit-on-sharing by subsequent stat after distributed transactions (e.g. stat after striped directory creation).

 Comments   
Comment by Lai Siyao [ 08/Feb/22 ]

On second thought, this will make transaction dependency hard to detect, while the benefit is trivial, it's not worthwhile to implement this.

Comment by Gerrit Updater [ 08/Mar/22 ]

"Lai Siyao <lai.siyao@whamcloud.com>" uploaded a new patch: https://review.whamcloud.com/46734
Subject: LU-15528 mdt: enqueue newly created object locks in TXN mode
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 269d1897fdad4ba86de3e7710a9f1be4edd70a10

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