CalDav long synchronization time

devprocode · June 8, 2023, 10:19am

Hello Support,

I use Calendar on different platforms (Android, Windows, iOS) with CalDav.

In general, this works as well.
However, the synchronization takes several seconds (7s-30s depending on the platform).

The behavior with an empty and filled calendar is the same.

I have already looked around and searched for solutions such as deleting the AccessTokens, but nothing has helped.

Do you have any idea how to fix this?

tcit · June 8, 2023, 12:46pm

This might be the same issue than this one (sync tokens are removed too aggressively).

github.com/nextcloud/server

[Bug]: Syncing (shared) calendar misses some events

opened 09:11PM - 09 Feb 23 UTC

Fjodor42

bug 0. Needs triage 25-feedback

### ⚠️ This issue respects the following points: ⚠️ - [X] This is a **bug**, no…t a question or a configuration/webserver/proxy issue. - [X] This issue is **not** already reported on Github _(I've searched it)_. - [X] Nextcloud Server **is** up to date. See [Maintenance and Release Schedule](https://github.com/nextcloud/server/wiki/Maintenance-and-Release-Schedule) for supported versions. - [X] Nextcloud Server **is** running on 64bit capable CPU, PHP and OS. - [X] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/). ### Bug description For a number of years, I have run my own NextCloud instance, on which I have renamed my user's default calendar to "Fælles Kalender" (Danish for Common Calendar), so my wife and I can both enter events into it, to update each other on events that affect us both. Both of us sync from Android phones (via DAVX5 as recommended), and I have also been subscribed via Thunderbird on both my personal and my work computers. As for the latter subscriptions, I used to just use the built-in CalDAV functionality, but have switched to the CalDAV connector for TbSync as per recommended, but to no avail of the problem described below. For quite some time, we have experienced the unfortunate state of affairs that, seemingly at random, her updates from her Android phone will not show up in my sync'ed applications, vice versa, and sometimes previously sync'ed events seem to "go missing". Due to lack of mental and chronological surplus, I have postponed looking further into this, but it cannot continue. I have recently noticed that the events will typically be shown in the web view of the calendar, and will, typically, show up if I un- and resubscribe, leading me to believe that the problem does not lie in actually storing new events or alterations to existing events, but I am at a loss regarding how to even ascertain whether this is even a NextCloud problem, or a problem shared between CalDAV implementations of Thunderbird, TbSync and DAVX5. Hence, initially, I am asking for help pinpointing where the problem lies, but have labeled is a bug, as the common denominator seem to be NextCloud, rather than the various clients. Please advise ### Steps to reproduce 1. Have more than one user share a calendar 2. Have them sync with multiple clients 3. ??? 4. Events disappear ### Expected behavior Shared access to a calendar should mean that all participants, whatever their CalDAV client, should be able to create and alter events and have their events, or changes to such, be reflected to all participants, regardless of the CalDAV-compliant client software used to sync. ### Installation method Community Web installer on a VPS or web space ### Operating system Debian/Ubuntu ### PHP engine version PHP 8.0 ### Web server Apache (supported) ### Database engine version PostgreSQL ### Is this bug present after an update or on a fresh install? None ### Are you using the Nextcloud Server Encryption module? Encryption is Disabled ### What user-backends are you using? - [X] Default user-backend _(database)_ - [ ] LDAP/ Active Directory - [ ] SSO - SAML - [ ] Other ### Configuration report ```shell { "system": { "instanceid": "***REMOVED SENSITIVE VALUE***", "passwordsalt": "***REMOVED SENSITIVE VALUE***", "hashingCost": 10, "trusted_domains": [ "nephele.molgaard.org" ], "datadirectory": "***REMOVED SENSITIVE VALUE***", "overwrite.cli.url": "https:\/\/nephele.molgaard.org", "version": "25.0.3.2", "dbtype": "pgsql", "dbhost": "***REMOVED SENSITIVE VALUE***", "dbname": "***REMOVED SENSITIVE VALUE***", "dbuser": "***REMOVED SENSITIVE VALUE***", "dbpassword": "***REMOVED SENSITIVE VALUE***", "dbtableprefix": "oc_", "logtimezone": "UTC", "installed": true, "mail_domain": "***REMOVED SENSITIVE VALUE***", "mail_from_address": "***REMOVED SENSITIVE VALUE***", "mail_smtpmode": "smtp", "filelocking.enabled": true, "memcache.local": "\\OC\\Memcache\\Redis", "redis": { "host": "***REMOVED SENSITIVE VALUE***", "port": 6379, "timeout": 0 }, "maintenance": false, "loglevel": 2, "logfile": "\/var\/log\/nextcloud\/nextcloud.log", "mail_smtphost": "***REMOVED SENSITIVE VALUE***", "mail_smtpport": "25", "trusted_proxies": "***REMOVED SENSITIVE VALUE***", "overwritehost": "nephele.molgaard.org", "overwriteprotocol": "https", "overwritecondaddr": "^195\\.201\\.133\\.130$", "enable_previews": true, "updatechecker": true, "htaccess.RewriteBase": "\/", "theme": "", "updater.release.channel": "stable", "app_install_overwrite": [ "files_downloadactivity", "ojsxc", "calendar", "contacts", "spreed", "socialsharing_twitter", "bruteforcesettings", "socialsharing_facebook", "files_trackdownloads" ], "default_phone_region": "ISO 3166-2:DK", "secret": "***REMOVED SENSITIVE VALUE***" } } ``` ### List of activated Apps ```shell Enabled: - activity: 2.17.0 - admin_audit: 1.15.0 - bruteforcesettings: 2.5.0 - calendar: 4.2.3 - circles: 25.0.0 - cloud_federation_api: 1.8.0 - comments: 1.15.0 - contacts: 5.1.0 - contactsinteraction: 1.6.0 - dashboard: 7.5.0 - dav: 1.24.0 - deck: 1.8.3 - federatedfilesharing: 1.15.0 - federation: 1.15.0 - files: 1.20.1 - files_downloadactivity: 1.15.0 - files_external: 1.17.0 - files_pdfviewer: 2.6.0 - files_rightclick: 1.4.0 - files_sharing: 1.17.0 - files_trackdownloads: 1.11.0 - files_trashbin: 1.15.0 - files_versions: 1.18.0 - firstrunwizard: 2.14.0 - logreader: 2.10.0 - lookup_server_connector: 1.13.0 - nextcloud_announcements: 1.14.0 - notifications: 2.13.1 - oauth2: 1.13.0 - password_policy: 1.15.0 - photos: 2.0.1 - privacy: 1.9.0 - provisioning_api: 1.15.0 - recommendations: 1.4.0 - related_resources: 1.0.4 - serverinfo: 1.15.0 - settings: 1.7.0 - sharebymail: 1.15.0 - socialsharing_facebook: 2.5.0 - socialsharing_twitter: 2.5.0 - support: 1.8.0 - survey_client: 1.13.0 - systemtags: 1.15.0 - text: 3.6.0 - theming: 2.0.1 - twofactor_backupcodes: 1.14.0 - updatenotification: 1.15.0 - user_status: 1.5.0 - viewer: 1.9.0 - weather_status: 1.5.0 - workflowengine: 2.7.0 Disabled: - encryption: 2.10.0 - ojsxc: 5.0.0 - spreed: 15.0.3 - suspicious_login: 4.2.1 - twofactor_totp - user_ldap ``` ### Nextcloud Signing status ```shell No errors have been found. ``` ### Nextcloud Logs ```shell Irrelevant for now, I think, as I have not myself been able to find anything in the logs. Please do advise as to changes to logging levels if relevant. ``` ### Additional info _No response_

devprocode · June 10, 2023, 10:39am

Hello @tcit,

I don’t have the problem that I miss data, but that the general synchronization takes quite a long time.

tcit · June 10, 2023, 12:56pm

Sync tokens are used to accelerate the synchronisation (by telling if something changed rather than check every collection for changes).

devprocode · October 8, 2023, 1:05pm

Hello @tcit
Ok, what is the solution now? Wait for the task to be solved?

Thanks!

tcit · October 9, 2023, 6:29am

It’s fixed in all Nextcloud supported stable versions.