回复: CTDB and per record persistency

[陈 方进]

Hello, martin.
The file copying scenario  involves a cluster built using CTDB, with two machines sharing a common public IP.
When you copy files to the shared directory and the node with the public IP experiences a failure with subsequent failover, the file copying process continues seamlessly without any error displayed on the Windows system.
Do you have any means to ensure that file copying can proceed normally even during transparent failover events?
Best wish!
________________________________
发件人: Martin Schwenke <martin at meltin.net>
发送时间: 2024年1月3日 14:50
收件人: samba-technical at lists.samba.org <samba-technical at lists.samba.org>
抄送: 陈 方进 <sharingfun520 at outlook.com>
主题: Re: CTDB and per record persistency

Hi,

On Wed, 27 Dec 2023 07:40:57 +0000, 陈 方进 via samba-technical
<samba-technical at lists.samba.org> wrote:

> Hello , I learned from Ralph Böhme's speech on persistent handles at
> the 2018 SambaXP conference that amitay had proposed an idea
> regarding the persistence of each record in CTDB.

> I'm curious to know if there has been any progress since then.

As far as I am aware, there hasn't been any progress on a new CTDB
database model to support persistent handles, with high performance.

> If not, are there any methods to help CTDB seamlessly handle node
> failures, preventing failures in the replication of files?

I'm a little bit confused by this question, because I don't understand
how "replication of files" comes into it.  It is really about
replicating file handle state.

I am seeing things like
https://gitlab.com/samba-team/samba/-/merge_requests/3461 (which I will
review very soon :-).  Mention of witness protocol may indicate that
someone is working on persistent handles... but I'll leave it to others
who know... rather than guessing myself.

peace & happiness,
martin