Mobile cache not clearing

  • Resolved haakonrjdyplink

    (@haakonrjdyplink)


    11 months, 3 weeks ago

    Hi again.

    This is a repeat of this issue

    https://ww.wp.xz.cn/support/topic/mobile-cache-not-clearing/

    On our newspaper, the mobile page stopped updating due to cache not being cleared on updates. Manually clearing the cache did not work either.

    As with the last time this happened five months ago we ended up deleting the directory of the mobile cache in wphb-cache. This fixed the issue, and cache on mobile worked normaly.

    This time when deleting the dir it still works, but the problem just reapears on the next cache, where it will no longer update.

    This is only on the mobile cache. Desktop cache works normaly.

    We have temporarily deactivated the plugin.

    All the information from our case 5 months ago still the same.

    • We have no other cache plugins
    • Runs on our own server with plenty of overhead
    • No changes where made prior to the incident
    • We are on the latest hummingbird version, and it was updated 2. june where the problem happend the 18. june
    • Size of files in the mobile cache is 4kb

    Site info

    ` wp-core

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    fonts_size: directory not found
    database_size: 1,75 GB (1874116608 bytes)
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    name: Newsroom Publisher Theme (newsroom-publisher-theme)
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    author: Dyplink
    author_website: https://dyplink.no/
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    Newsroom Publisher Categories: version: 1.0.3, author: Dyplink, Auto-oppdateringer slått av
    Newsroom Publisher Core: version: 2.0.1, author: Dyplink, Auto-oppdateringer slått av
    Newsroom Publisher Dx: version: 1.1.3, author: Dyplink, Auto-oppdateringer slått av
    Newsroom Publisher Epaper: version: 1.0.3, author: Dyplink, Auto-oppdateringer slått av
    Newsroom Publisher Front Page: version: 3.1.3, author: Dyplink, Auto-oppdateringer slått av
    Newsroom Publisher Housing: version: 2.0.0, author: Dyplink, Auto-oppdateringer slått av
    Newsroom Publisher Id Portal: version: 2.4.0, author: Dyplink, Auto-oppdateringer slått av
    Newsroom Publisher Kilkaya: version: 2.2.1, author: Dyplink, Auto-oppdateringer slått av
    Newsroom Publisher Modules: version: 2.0.7, author: Dyplink, Auto-oppdateringer slått av
    Newsroom Publisher Newsticker: version: 1.0.0, author: Dyplink, Auto-oppdateringer slått av
    Page Links To: version: 3.3.7, author: Mark Jaquith, Auto-oppdateringer slått av
    PublishPress Future: version: 4.7.1, author: PublishPress, Auto-oppdateringer slått av
    Simple SMTP: version: 1.3.3, author: soup-bowl & Contributors, Auto-oppdateringer slått av
    Smush: version: 3.18.1, author: WPMU DEV, Auto-oppdateringer slått av
    Solid Security Basic: version: 9.3.8, author: SolidWP, Auto-oppdateringer slått av
    User Role Editor: version: 4.64.5, author: Vladimir Garagulya, Auto-oppdateringer slått av
    WP Logo Showcase Responsive Slider and Carousel: version: 3.8.4, author: Essential Plugin, Auto-oppdateringer slått av
    WP User Avatars: version: 1.4.1, author: Triple J Software, Inc., Auto-oppdateringer slått av
    Yoast SEO: version: 25.3, author: Team Yoast (latest version: 25.3.1), Auto-oppdateringer slått av wp-plugins-inactive (3)

    Hummingbird: version: 3.14.1, author: WPMU DEV, Auto-oppdateringer slått av
    Newsroom Publisher Subscription: version: 1.3.16, author: Dyplink, Auto-oppdateringer slått av
    Query Monitor: version: 3.18.0, author: John Blackbourn, Auto-oppdateringer slått av wp-media

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    imagick_limits:
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    imagick::RESOURCETYPE_DISK: 8589934592
    imagick::RESOURCETYPE_FILE: 768
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    imagick::RESOURCETYPE_MEMORY: 2 GB
    imagick::RESOURCETYPE_THREAD: 1
    imagick::RESOURCETYPE_TIME: 1.844674407371E+19
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    WP_HOME: undefined
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    wordpress: writable
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    uploads: writable
    plugins: writable
    themes: writable
    fonts: does not exist
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    pro: free
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    The page I need help with: [log in to see the link]

Viewing 7 replies - 1 through 7 (of 7 total)
  • Thread Starter haakonrjdyplink

    (@haakonrjdyplink)

    11 months, 3 weeks ago

    We have done some debugging, and we think we have found the problem.

    A post had the url “/aret-som-gar—juni”.

    This was cached as

    dir: 'aret-som-gar-\xE2\x80\x91-juni' file: 'aret-som-gar-\xE2\x80\x91-juni8ca1ca5fb6c01e2c5110a2f77840af06.html'

    Hummingbird was unable to clear this file from cache. While it was cached on desktop it was handled after many of the desktop files where cleared, crashing the cache process so it never got to clearing the mobile cache.

    The problem seems to be the ‘—‘ in the url of the post leading to the single quotes in the file name.

    ‘—‘ represents a special character called a em dash, which is a long dash. We belive the journalist uses a external writing tool then pasted it into the gutenberg editor.

    So this seams to be a bug where ‘—‘ in the url causes the cached filename to contain characters or formating that the clear cache function is unable to handle.

    best regards Haakon Reiss-Jacobsen Dyplink AS

    Plugin Support Nithin – WPMU DEV Support

    (@wpmudevsupport11)

    11 months, 3 weeks ago

    Hi @haakonrjdyplink,

    A post had the url “/aret-som-gar—juni”.

    I’m not able to create a post with  ‘—‘ in the url, it either gets change to hypen or just gets removed if I try to re-edit the permalink with  ‘—‘ in the url .

    It appears by default WP doesn’t allow creating a post with  ‘—‘ in the url other than a single hypen.

    Are you able to create a post with  ‘—‘ in the url ? If yes, such a behaviour shouldn’t have occurred in the 1st place.

    I highly recommend running a conflict test to rule out what might be changing this default behavior in WordPress, so it doesn’t occur in general.

    I’ll make sure to bring your observation to our Hummingbird team’s attention to check if there are any improvements needed in such use cases.

    Regards,

    Nithin

    Thread Starter haakonrjdyplink

    (@haakonrjdyplink)

    11 months, 3 weeks ago

    Thank you for the reply.

    No I am unable to recreate it myself. I have contacted the newspaper and asked if they can send me the original file where the article where copied from. Some of their journalist prefer to write in other tools then paste the result into gutenberg.

    /Haakon

    Plugin Support Patrick – WPMU DEV Support

    (@wpmudevsupport12)

    11 months, 3 weeks ago

    Hi @haakonrjdyplink

    Thank you for the explanation.

    Yes, indeed it is pretty odd, WordPress by itself will strip special characters from slug, but I tried to replicate by using a Permalink Manager plugin and force a special character in one slug, then made sure the folder was created on desktop and mobile under Hummingbird cache folder which worked, then edited the post and checked the mobile browser + the folder and can confirm it correctly flushed the caching.

    In case you have more detail on step taken please let us know and we can try to replicate once again.

    Best Regards
    Patrick Freitas

    Kris – WPMU DEV Support

    (@wpmudevsupport13)

    11 months, 1 week ago

    Hi @haakonrjdyplink

    We haven’t heard from you in a while, I’ll go and mark this thread as resolved. If you have any additional questions or require further help, please let us know!

    Kind Regards,
    Kris

    Thread Starter haakonrjdyplink

    (@haakonrjdyplink)

    9 months, 4 weeks ago

    Hi again. Sorry but we never got a response from the publisher, so where unable to reproduce the problem.

    It now happened again, and this time we where able to catch it and reproduce the problem.

    The character causing the issue is this: non-breaking hyphen character ‑, U+2011, coded by ‑ or ‑

    Browsers handles encoding correclty when accessing the page, though you will be sendt to a 404 page. We where able to get the special encoding when we ran a curl request with arg –path-as-is.

    It encodes the character in a certain way where hb is able to add it to cache dir, but not deleted when clearing cache.

    curl –path-as-is “https://stage.dypnytt.no/helhetlig-okonomistyring-\xE2\x80\x91-ikke-en-forenklet-forklaring/” -o /dev/null

    We suspect its a bot or similar that triggers the problem, as every browser we testet did not cause the issue.

    A potential solution that would partially solve this problem is to handle clearing of cached files one file at a time. Right now when the process is unable to delete a file it stops the deletion process causing desktop to be mostly cleared, while mobil never gets cleared.

    As we relised it causes a 404 we have removed caching of 404 page, to make the problem not happen again.

    best regards: Haakon Reiss-Jacobsen, Dyplink AS

    Plugin Support Amin – WPMU DEV Support

    (@wpmudev-support2)

    9 months, 4 weeks ago

    Hello @haakonrjdyplink

    Thank you for sharing additional information.

    I will bring this info to our Hummingbird team’s attention for further review, we may be able to improve the clearing cache functions on our end.

    Best Regards
    Amin

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

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