Store.clear() claims that it will purge all entries from memory and disk cache

     /**
     * purges all entries from memory and disk cache
     * Persister will only be cleared if they implements Clearable
     */
    void clear();

But in fact it only clears from the disk the entries that are currently in the memory cache.

    @Override
    public void clear() {
        for (Key cachedKey : memCache.asMap().keySet()) {
            clear(cachedKey);
        }
    }

If you call this method after a cold start, nothing will be purged from disk, leaving many entries roaming around the disk without a pointer.