[LU-10280] DoM cross-file open+readahead via statahead

• Type: Technical task
• Resolution: Unresolved
• Priority: Minor
• Labels: DoM2
• Assignee: WC Triage
• Reporter: Andreas Dilger

Description

Using the statahead mechanism, the client should detect if files are being looked up in directory order and then opened + read. If that is the case, the client could start doing open+read RPCs in advance to fetch the DoM data to the client.

We'd have to have a mechanism (timeout?) to close the pre-opened files if the application stopped this access pattern, or the statahead pattern was stopped.

Issue Links

• is related to: LU-10919 DoM: read data on stat() and readdir()
• is related to: LU-16247 do open()+readahead for DoM files as batched operations
• is related to: LU-17118 Cross files' read-ahead
• is related to: LU-3285 Data on MDT
• is related to: LU-14139 batched statahead processing