Re: WebDAV folders internally have hundreds of copies of the same few files

[Ken Murchison <murch@xxxxxxxxxxxx>]

On 11/15/18 1:48 AM, Anatoli wrote:

Hi Ken,

Thanks a lot for the clarification, everything makes sense now. How can I list the files marked for deletion and those that are not marked? unexpunge can provide the list of files marked for deletion, is there any better way to list them, directly reading the DB? How to list those that are not marked?

If you login as an admin, you should be able to SELECT the mailbox and use normal IMAP commands.  Alternatively, if you add "+DAV" to a regular userid, this will also allow SELECTing of DAV collection mailboxes.

One more question, related: we got a client who's PC was crashing exactly during the modify operation (some issue with the PC hardware triggered by Excel save operation, probably a RAM spike touching some bad blocks). As a result, the file in Cyrus was becoming damaged, i.e. partially saved. Is it expected?

Shouldn't Cyrus update the db with the pointer to the new file (a new message in the store) only if the operation completes successfully (e.g. the WebDAV messages exchange completes and the connection is closed at the right time or something similar)?

If the append of the resource into the mailbox, or updating the DAV db entry fails, the operation should be reverted, with partial saving done.  Which version of Cyrus are you using?

From: Ken Murchison
Sent: Wednesday, November 14, 2018 10:54
To: Info-cyrus
Subject: Re: WebDAV folders internally have hundreds of copies of the same few files

On 11/13/18 10:15 PM, Anatoli wrote:

Hi,

I'm not sure this is due to some configuration option, bug or feature, but I'm observing some folders on Cyrus HTTP WebDAV server having hundreds (995 at this moment to be precise) internal files in the format "NNN." that correspond to the same file but different versions in time.

There are 2-3 files (xls) in the folder that are edited constantly during the day and it looks like each save operation creates a new file. The files are of some 3-5Mb each. In the explorer/web view there are only a couple of files with a total size of 17.5Mb, but the reported disk usage for the folder is of 1.6Gb.

Could someone please shed some light on what's going on and how to make each file visible to the users to be stored in only one internal file?

Thanks,
Anatoli

Because *DAV is layered on top of an IMAP store, we have to abide by IMAP semantics in which messages (in this case DAV resources) are immutable.  Therefore, we can NOT overwrite an existing message in the mailbox.  Each change MUST result in a new message.  However, the server does mark the previous version(s) as deleted and expunged, which means that they will eventually be removed by cyr_expire.  If you aren't running cyr_expire, you should consider adding an event to cyrus.conf to remove expunged messages (see -X option).

-- 
Ken Murchison
Cyrus Development Team
FastMail US LLC

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-- 
Ken Murchison
Cyrus Development Team
FastMail US LLC

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