Multisite – transient caching expiration with Redis object cache

imrelaszlo
(@imrelaszlo)

6 days, 14 hours ago

Hello!

After a while the transients stored in Redis cache on multisite install, losts. I’ve a CRON that runs on every 20 minutes. Loops over the sites and calls WP CRON, with WP-CLI. It was worked before, nothing touched. There are some data that stored in a transient, and on the next run, processed. Long, slow process, this is the cause of the relatively rare CRON run period. The problem: the transient data is lost.

It I call the CRON frequently, the data was saved and loaded good. Only if there are some time between the runs, the data losts. Redis backend used.

In the earlier LiteSpeed versions if my memory good, there was a setting for this (store transients in object cache), but I cannot find it after LiteSpeec Cache plugin updates.

So, the question: how can I increase the transient timeout?

Viewing 7 replies - 1 through 7 (of 7 total)

Plugin Support litetim
(@litetim)

6 days, 14 hours ago

@imrelaszlo
In 7.8 we removed Store transients but LSC is behaving like setting is on: always saving transients to Object Cache(OC).
Have you tried: https://docs.litespeedtech.com/lscache/lscwp/cache/#default-object-lifetime ? Also some transients will be saved without timeout, UNTIL purge all cache is run. When is cleared, all the transients from OC are deleted.
Thread Starter imrelaszlo
(@imrelaszlo)

6 days, 14 hours ago
Hello @litetim !

The “Default Object Lifetime” setting is 3600. There was many full cache purge. In the set_transient() function there are 30 minutes for timeout. I’ve tried with reduced CRON frequency (10 minutes), still losing the data. If I call it more frequent (manually), it works. Here s my custom shell script:
```
#!/bin/bash
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

for url in $( plesk ext wp-toolkit --wp-cli -instance-id 5 -- site list --field=url --deleted=0 --archived=0 --skip-plugins --skip-themes ); do
  plesk ext wp-toolkit --wp-cli -instance-id 5 -- cron event run --quiet --due-now --url="$url"
done
```
This is needed to run all site’s cron with CLI.
Plugin Support litetim
(@litetim)

6 days, 13 hours ago

@imrelaszlo
have you checked LSC => Toolbox => Debug => Purge logs?
What do you mean losing the data? Do you mean transients dissapear?

Thread Starter imrelaszlo
(@imrelaszlo)

6 days, 13 hours ago

@litetim

I’ve not found this: LSC => Toolbox => Debug => Purge logs?

LiteSpeed Cache Toolbox v7.8.1

Running on LiteSpeed Enterprise web server.

Data lose: transient data is empty (not found). Yes, disapperars.
Plugin Support litetim
(@litetim)

6 days, 13 hours ago
@imrelaszlo Enable Debug: https://docs.litespeedtech.com/lscache/lscwp/toolbox/#debug-log (don’t leave it ON for long)
And look in Logs Tab: https://docs.litespeedtech.com/lscache/lscwp/toolbox/#log-view-tab => Purge Logs
I think something is purging the cache.
Now, when OC is ON, all transients are saved to Redis, not database.
- This reply was modified 6 days, 12 hours ago by litetim.
Thread Starter imrelaszlo
(@imrelaszlo)

1 day, 16 hours ago

@litetim

I’ve enabled debug, wait for an import, but no success… Reduced CRON frequency to 8 minutes, still not OK. The log does not contain any “purge” string. What should I search for? And, is the Basic log level enought, or I need to incease the log level to include this events?

Plugin Support litetim
(@litetim)

1 day, 15 hours ago

@imrelaszlo
Debug level is set to advanced? https://docs.litespeedtech.com/lscache/lscwp/toolbox/#debug-level
From https://docs.litespeedtech.com/lscache/lscwp/toolbox/#log-view-tab please select: Purge Log from the buttons above the logs list.

Viewing 7 replies - 1 through 7 (of 7 total)

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