[LU-10889] Inconsistent request deadline between client and server.

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.12.0
• Labels: patch
• Severity: 3

Epic

timeout

• Assignee: Alexander Boyko
• Reporter: Alexander Boyko

Description

A client can resend requests and a server have ability to find a duplicate requests. In this case a server drops the request. As a result the client request deadline is different than the deadline for same request at server.
For example

00000100:00080000:11.1F:1468964870.796746:0:27071:0:(service.c:1556:ptlrpc_server_check_resend_in_progress()) @@@ Found duplicate req in processing  req@ffff880d9168b080 x1539226900119556/t0(0) o101->08998e08-887e-a620-6fb3-36cb6d9403ee@2145@gni1:-1/-1 lens 576/0 e 0 to 0 dl 1468965375 ref 1 fl New:/2/ffffffff rc 0/-1
00000100:00080000:11.1:1468964870.796752:0:27071:0:(service.c:1557:ptlrpc_server_check_resend_in_progress()) @@@ Request being processed  req@ffff880cd7f5dcc0 x1539226900119556/t0(0) o101->08998e08-887e-a620-6fb3-36cb6d9403ee@2145@gni1:-1/-1 lens 576/0 e 0 to 0 dl 1468965030 ref 1 fl New:/0/ffffffff rc 0/-1

At client request x1539226900119556 has deadline 1468965375, at server 1468965030. So, in the worst case the client will wait for 345sec long than server for the request.