[LU-11478] LNet: discovery sequence numbers could be misleading

• Type: Technical task
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.13.0, Lustre 2.12.3
• Labels: lnet-health lnet-router
• Assignee: Amir Shehata (Inactive)
• Reporter: Amir Shehata (Inactive)

Description

There is a sequence number used when sending discovery messages. This sequence number is intended to detect stale messages. However it could be misleading if the peer reboots. In this case the peer's sequence number will reset. The node will think that all information being sent to it is stale, while in reality the peer might've changed configuration.

There is no reliable why to know whether a peer rebooted, so we'll always assume that the messages we're receiving are valid. So we'll operate on the first come first serve basis.

Issue Links

• is duplicated by: LU-12197 incorrect peer nids with discovery enabled

Comments

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/36041/
Subject: LU-11478 lnet: misleading discovery seqno.
Project: fs/lustre-release
Branch: b2_12
Current Patch Set:
Commit: da9998767a9093c088d28119179ee591f42910dc

[Gerrit Updater]

Minh Diep ([e-mail]) uploaded a new patch: https://review.whamcloud.com/36041
Subject: LU-11478 lnet: misleading discovery seqno.
Project: fs/lustre-release
Branch: b2_12
Current Patch Set: 1
Commit: 139abfc32612018eea7cc4b882fbfcd7f1f643e1

[Joseph Gmitter (Inactive)]

Work has landed as part of the MR Routing merge commit: https://review.whamcloud.com/#/c/34983/

[Gerrit Updater]

Amir Shehata ([e-mail]) merged in patch https://review.whamcloud.com/33304/
Subject: LU-11478 lnet: misleading discovery seqno.
Project: fs/lustre-release
Branch: multi-rail
Current Patch Set:
Commit: 42d999ed8f6113724b1ac103b832d5b74b878d55

[Gerrit Updater]

Amir Shehata ([e-mail]) uploaded a new patch: https://review.whamcloud.com/33304
Subject: LU-11478 lnet: misleading discovery seqno.
Project: fs/lustre-release
Branch: multi-rail
Current Patch Set: 1
Commit: 09146925f301c951513ea70fd6f80ad544a73f97