Log error "Could not deserialize persisted classifier"

BMerz · June 26, 2020, 5:25pm

Hello,
I have following errors from mail app in nextcloud log:
OCA\Mail\Exception\ServiceException: Could not deserialize persisted classifier 3: File /tmp/oc_tmp_wKOmYa does not contain any data.

Today I had 19 messages like this in the log with different file names and different classifier IDs.

It seems that the error is triggered from execution of cron.php

Occurence of the exception is here:

github.com

nextcloud/mail/blob/5992d04cfd769a79dedad822b5dff753976f407c/lib/Service/Classification/PersistenceService.php#L193


			$this->cache($id, $serialized);
		}

		$tmpPath = $this->tempManager->getTemporaryFile();
		file_put_contents($tmpPath, $serialized);

		try {
			$persister = new Filesystem($tmpPath);
			$estimator = $persister->load();
		} catch (RuntimeException $e) {
			throw new ServiceException("Could not deserialize persisted classifier $id: " . $e->getMessage(), 0, $e);
		}
		if (!($estimator instanceof Estimator)) {
			throw new ServiceException("Deserialized estimator has an unknown type " . get_class($estimator));
		}

		return $estimator;
	}

	private function getCacheKey(int $id): string {
		return "mail_classifier_$id";

What’s wrong here?

Mail App version 1.4.0
Nextcloud version 18.0.6

strugee · June 26, 2020, 8:46pm

Sounds like a bug. I would report it at https://github.com/nextcloud/mail/issues.

ChristophWurst · June 26, 2020, 8:49pm

Yep. This is quite unexpected. Please report so we can have a closer look.

Cheers

BMerz · June 27, 2020, 12:14pm

Issue is already reported by ovv:
#3327