[LU-7] Reconnect server->client connection

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.7.0, Lustre 2.5.5
• Labels: llnl
• Bugzilla ID: 3,622
• Assignee: nasf (Inactive)
• Reporter: Robert Read

Description

Local tracking bug for 3622.

Issue Links

• is duplicated by: LU-793 Reconnections should not be refused when there is a request in progress from this client.
• is related to: LU-793 Reconnections should not be refused when there is a request in progress from this client.
• is related to: LU-5520 BL AST resend
• is related to: LU-1239 cascading client evictions
• is related to: LU-1565 lost LDLM_CANCEL RPCs

Comments

[Andreas Dilger]

Closing this old issue.

All of the sub issues have been closed and patches landed for related problems. Servers should resend RPCs to clients in appropriate circumstances before evicting them.

[James A Simmons]

What is left for this work?

[Vitaly Fertman]

BL AST re-send is moved to LU-5520

[Christopher Morrone (Inactive)]

No, it might work. Haven't had a chance to try it yet.

[Cory Spitz]

Chris, are you saying that the patches from LU-793 are not sufficient to fix your issue?

[Christopher Morrone (Inactive)]

Well, no, not my issue. Although my issue may have been lumped in with a bunch of other things. We have specifically been waiting years for issue 3 to be solved.

[Vitaly Fertman]

Chris,

in fact, you issue is client eviction because cancel is not delivered to server.
it may have several different reasons:

1. cancel is lost. it is to be resent - fixed by LU-1565

2. BL AST is lost. BL AST is to be resent - fixed by this patch.

3. CANCEL cannot be sent due to absent connection, re-CONNECT fails with rpc in progress - fixed by LU-793

4. CONNECT cannot be handled by server as all the handling threads are stuck with other RPCs in progress - fixed by LU-1239

5. PING cannot be handled by server as all the handling threads are stuck with other RPCs and client cannot even start re-CONNECT - fixed by LU-1239

[Christopher Morrone (Inactive)]

Vitaly, I don't understand what that has to do with this ticket. Please expand the explanation, or start a new ticket.

[Vitaly Fertman]

BL AST resend: http://review.whamcloud.com/9335

[Cory Spitz]

Re the last comment, that would be LU-1239, http://review.whamcloud.com/2355.

Also, LU-793, 'Reconnections should not be refused when there is a request in progress from this client', http://review.whamcloud.com/#change,1616 would also improve the situation by allowing clients to reconnect with RPCs in process.