[LU-7236] connections on demand

• Status: Resolved
• Project: Lustre
• Fix Version/s: Lustre 2.12.0
• Type: Improvement
• Priority: Minor
• Reporter: Alex Zhuravlev
• Assignee: Alex Zhuravlev
• Resolution: Fixed
• Labels: OSJ

Description

currently Lustre client establishes connections to all targets at mount and tries to keep them alive all the time. at big scale this can lead to lots of extra work at mount, failover.

Issue Links

• is blocked by: LU-10018 MDT as a statfs proxy
• is related to: LU-11518 lock_count is exceeding lru_size
• is related to: LU-12328 FLR mirroring on 2.12.1-1 not usable ...
• is related to: LU-9660 reduce ptlrpcd wakeups on idle system
• is related to: LU-11126 replay-single test 89: import.c:1668:...
• is related to: LU-11128 replay-single test timeout
• is related to: LU-11206 recovery-mds-scale test failover_ost ...
• is related to: LU-5703 Quiesce client mountpoints from the s...
• is related to: LU-9441 Use kernel threads in predictable fas...
• is related to: LU-9555 "df /path/to/project" should return p...
• is related to: LU-11405 add a test for idle connection feature

Comments

[Gerrit Updater]

Alex Zhuravlev ([e-mail]) uploaded a new patch: http://review.whamcloud.com/16682
Subject: LU-7236 ptlrpc: idling connections can disconnect
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 83d9fc0a0a7914174a5373142b183a7bd99be70a

[Robert Read (Inactive)]

Interesting idea. I remember discussing this ages ago when we made the initial connection asynchronous, but don't recall exactly why we didn't do it. Still sounds like a good idea to me.

[Alex Zhuravlev]

there was a discussion at LAD. Developers from Fujitsu said that connections are consuming quite amount of memory. Then we recalled that there are other possible cases where less connection can help - like recovery, cluster startup.

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/16682/
Subject: LU-7236 ptlrpc: idle connections can disconnect
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 5a6ceb664f07812c351786c1043da71ff5027f8c

[Peter Jones]

Landed for 2.12