phalcon/cphalcon · warning · Phalcon\Mvc\Model\MetaData\Exceptions\MetaDataStrategyFailed

Failed to store metaData to the cache adapter

Error message

Failed to store metaData to the cache adapter

What it means

After metadata is computed on a cache miss, MetaData::write() persists it with adapter->set(key, data). If that call returns false or throws (backend down, wrong credentials, unwritable directory, oversized payload), write() consults the orm.exception_on_failed_metadata_save setting (also settable via Phalcon\Mvc\Model\Model::setup(['exceptionOnFailedMetaDataSave' => ...])): with the setting enabled it throws MetaDataStrategyFailed, otherwise it raises a PHP warning via trigger_error(). The computed metadata still works in memory for the current request — only persistence failed.

Source

Thrown at phalcon/Mvc/Model/MetaData.zep:1063

                    unset(this->pendingMetaDataWrites[key]);
                }
            }
            return true;
        }
        return false;
    }

    /**
     * Throws an exception when the metadata cannot be written
     */
    private function throwWriteException(var option) -> void
    {
        string message;

        let message = "Failed to store metaData to the cache adapter";

        if option {
            throw new MetaDataStrategyFailed(message);
        } else {
            trigger_error(message);
        }
    }
}

View on GitHub (pinned to b7419de9cd)

Solutions

1. Restore the backend: verify connectivity, credentials, and (for Stream) that the metadata directory exists, is writable, and has space.
2. Delete stale or poisoned 'meta-*' entries so the next write carries a clean payload.
3. If requests must survive cache outages, keep orm.exception_on_failed_metadata_save off (write failures then only warn) — but alert on the warning.
4. Match the adapter's serializer with what the backend supports on every node.

Example fix

// before: Stream adapter writing to a read-only directory
$metaData = new Phalcon\Mvc\Model\MetaData\Stream([
    'metaDataDir' => '/var/www/app/config/', // not writable -> write fails
]);

// after
$metaData = new Phalcon\Mvc\Model\MetaData\Stream([
    'metaDataDir' => '/var/www/app/cache/metadata/', // writable, shipped empty
]);

// Pre-flight: prove the metadata backend accepts writes before the first model query
$probe = new Phalcon\Cache\Adapter\Redis($redisOptions); // same backend settings as MetaData
if (!$probe->set('meta-healthcheck', 1)) {
    $di->setShared('modelsMetadata', new Phalcon\Mvc\Model\MetaData\Memory());
}

use Phalcon\Mvc\Model\MetaData\Exceptions\MetaDataStrategyFailed;

try {
    $invoices = Invoices::find(); // first query computes and stores metadata
} catch (MetaDataStrategyFailed $e) {
    $logger->error('metadata backend write failed: ' . $e->getMessage());
    $di->setShared('modelsMetadata', new Phalcon\Mvc\Model\MetaData\Memory()); // degrade gracefully
    $invoices = Invoices::find();
}

When it happens

Trigger: The first model query of a process after a deployment (cache miss triggers write) while the metadata backend refuses writes: Redis/Libmemcached unreachable or read-only, Stream adapter's metaDataDir lacking write permission or disk space, or an adapter whose set() returns false.

Common situations: Cache node restarts during deploys; container images where the metadata directory is read-only; permission changes on cache/metadata; transient network failures to Redis; enabling exceptionOnFailedMetaDataSave and then hitting a routine cache outage.

Related errors

• Identity column '{identityField}' isn't part of the table co
• Column '{column}' have not defined a data type in '{classNam
• Column '{column}' isn't part of the table columns in '{class
• The meta-data is invalid or is corrupt
• A dependency injection container is required to access inter

AI-assisted analysis of phalcon/cphalcon@b7419de9cd (2026-08-21). Data as JSON: /api/errors/4be6f045dbbf5041. Report an issue: GitHub.