[LU-12121] DOM: BRW to missing obj?

• Type: Bug
• Resolution: Duplicate
• Priority: Minor
• Affects Version/s: Lustre 2.12.0
• Environment: CentOS 7.6
• Severity: 3
• Assignee: Mikhail Pershin
• Reporter: Stephane Thiell

Description

From time to time, I can see BRW to missing obj error on MDTs with DOM:

fir-md1-s2: Mar 26 10:45:33 fir-md1-s2 kernel: LustreError: 90902:0:(mdt_io.c:442:mdt_preprw_write()) fir-MDT0003: BRW to missing obj [0x28000f666:0xca48:0x0]
fir-md1-s2: Mar 26 10:48:36 fir-md1-s2 kernel: LustreError: 91887:0:(mdt_io.c:442:mdt_preprw_write()) fir-MDT0003: BRW to missing obj [0x28000f7a6:0x1bfa:0x0]
fir-md1-s2: Mar 26 10:48:38 fir-md1-s2 kernel: LustreError: 91726:0:(mdt_io.c:442:mdt_preprw_write()) fir-MDT0003: BRW to missing obj [0x28000f666:0xd1a1:0x0]
fir-md1-s2: Mar 26 10:49:05 fir-md1-s2 kernel: LustreError: 91846:0:(mdt_io.c:442:mdt_preprw_write()) fir-MDT0003: BRW to missing obj [0x28000f52a:0x98bf:0x0]
fir-md1-s2: Mar 26 10:53:48 fir-md1-s2 kernel: LustreError: 91423:0:(mdt_io.c:442:mdt_preprw_write()) fir-MDT0003: BRW to missing obj [0x28000f7bb:0x6d61:0x0]

Any idea of what is causing this, is it just a warning? Note: we haven't noticed any real issue, I am just wondering.

Thanks!
Stephane

Issue Links

• duplicates: LU-11359 racer test 1 times out with client hung in dir_create.sh, ls, … and MDS in ldlm_completion_ast()

Comments

[Stephane Thiell]

These messages don't show up anymore since we're using https://review.whamcloud.com/#/c/34071/ everywhere.

[Stephane Thiell]

Thanks!!

[Peter Jones]

Seems that we can close this as a duplicate then and should focus on getting LU-11359 finalized ASAP

[Mikhail Pershin]

That may happens when DOM files are deleted, the object on MDT is deleted much quicker than on OST so client may do data flush for already deleted object. That is handled also in https://review.whamcloud.com/34071

[Peter Jones]

Mike

Can you please comment?

Thanks

Peter