Pythonanywhere oserror write error

This seems sort of right. Just today, I’ve gotten this many errors:

2019-10-08 11:17:44,606: OSError: write error
2019-10-08 11:17:44,608: OSError: write error
2019-10-08 11:17:44,622: OSError: write error
2019-10-08 12:21:50,935: OSError: write error
2019-10-08 14:46:05,534: OSError: write error
2019-10-08 14:46:05,535: OSError: write error
2019-10-08 16:05:28,771: OSError: write error
2019-10-08 16:16:03,225: OSError: write error
2019-10-08 16:16:18,039: OSError: write error
2019-10-08 16:47:11,276: OSError: write error
2019-10-08 16:47:11,301: OSError: write error
2019-10-08 17:41:29,032: OSError: write error
2019-10-08 17:45:55,173: OSError: write error
2019-10-08 19:06:37,768: OSError: write error
2019-10-08 19:06:37,783: OSError: write error
2019-10-08 21:02:06,188: OSError: write error
2019-10-09 00:26:46,175: OSError: write error
2019-10-09 00:27:46,375: OSError: write error
2019-10-09 01:19:09,919: OSError: write error
2019-10-09 01:57:23,046: OSError: write error
2019-10-09 01:57:23,106: OSError: write error
2019-10-09 03:16:00,727: OSError: write error
2019-10-09 04:22:51,426: OSError: write error
2019-10-09 11:02:28,651: OSError: write error
2019-10-09 12:01:18,268: OSError: write error
2019-10-09 12:24:24,783: OSError: write error
2019-10-09 12:24:24,816: OSError: write error
2019-10-09 15:30:31,227: OSError: write error
2019-10-09 15:30:31,226: OSError: write error
2019-10-09 15:33:22,601: OSError: write error
2019-10-09 16:42:37,676: OSError: write error
2019-10-09 16:44:19,278: OSError: write error
2019-10-09 16:44:19,619: OSError: write error
2019-10-09 16:47:06,667: OSError: write error
2019-10-09 16:48:54,776: OSError: write error
2019-10-09 16:48:54,789: OSError: write error
2019-10-09 16:49:27,862: OSError: write error
2019-10-09 16:56:18,781: OSError: write error
2019-10-09 16:57:16,560: OSError: write error

I’m worried that I can’t find what view specifically is causing the redirects — in addition, some are literally just 0.5 seconds response time — does this mean the website loaded in 0.5 seconds, or that they redirected away by going somewhere else after just 0.5 seconds. If it’s the former, there’s not much I can do about this right — they’re just leaving before my site’s loaded, right?

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OSError: Write Error

Getting lots of OSError: Write Error many times in a day in my error log. Looking at old forum threads it appears to be causable by 2 things — attempting to touch wsgi.py and messing that up, or cookies failing to be set in a browser. Anyone have any clue why any of these could be happening?

show us the code that is producing the error

Those normally happen when a browser disconnects from your site while it’s trying to send back a response. All sites get a few of them from time to time, because people connect over unreliable networks (for example, mobile) and get disconnected, but if you’re getting a lot it might be a sign of a problem.

The most likely cause is that one or more of the views on your site are slow to return a response — then people will give up and click away to another page, or hit refresh, or do something else that will interrupt the connection. I’d suggest looking at the access log for the site — each request you get has a line in there, and they all have a response-time in seconds at the end. A quick and easy way to find the requests that were interrupted is to search for » 499 » — that’s space, 4, 9, 9, space — which will take you to lines with a 499 status code. 499 is a synthetic status code that nginx puts into the access logs when the browser disconnects.

Once you’ve found which views are running slowly enough that people are interrupting them, you can take a look at your code to try to work out why they’re running slowly.

This seems sort of right. Just today, I’ve gotten this many errors:

I’m worried that I can’t find what view specifically is causing the redirects — in addition, some are literally just 0.5 seconds response time — does this mean the website loaded in 0.5 seconds, or that they redirected away by going somewhere else after just 0.5 seconds. If it’s the former, there’s not much I can do about this right — they’re just leaving before my site’s loaded, right?

why do you think there is a redirect in your code? this should be user side behavior, where they click to go to a different page while your page is still loading. it could be going to a different page on your site. but as Giles said, check the 499 status codes in your access log to see what pages they are leaving from. if you don’t see a pattern- could it just be that you have high traffic and not enough webworkers to serve all your web requests quickly enough?

there are redirects — i redirect from a link whcih sets cookies to my index page. the 499 status codes just say they’re leaving as they load different static files — some the css, some the js, they’re leaving as those are loading. that would probably indicate that they just left while the website was loading right?

as for the high traffic — my google analytics says i have around 2k unique users, but the pythonanywhere stats say ive had 65k nonunique hits in the past 2 months — is there any more info on what the hits traffic means?

if you mean that there are external links that link/direct to your index page, then that shouldn’t matter her.

yes the 499s mean that your users are leaving before your front page has finished loading. You should setup static files mapping so that your core webservers don’t need to serve the static files and just needs to serve the base front page.

the reason for the hits is probably because each page might have multiple hits to multiple static assets. another reason to put them as a static file mapping.

if you are still seeing very slow speeds after fixing that, then you should consider putting a cdn in front of pythonanywhere, or adding more webworkers.

thanks for the advice! i’ll look into all of this

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Forums

OSError: write error

I have a flask app that writes to a .txt file to keep track of blacklisted IPs. It works most of the time, but occasionally I get an error, «OSError: write error»

My confusion here is, the exact same code never has this issue on replit or when hosted locally, the issue seems to be exclusive to pythonanywhere. For now I’ve resolved it by adding error handling and having it retry if it fails, works fine, but why am I getting write errors with pythonanywhere in the first place?

(Extra note: I always close my files at the end of each function and I tested to see if it was crossover, but even when I que writing to the file to ensure there is no possible crossover, the error still occurs. Also, I know I could also switch to using SQL to store the IPs but I want to figure out what’s going on here regardless.)

Do the errors look like the ones mentioned in this help page? If so, they may be a result of your site running slowly — check out the page for more information.

Thanks for the speedy reply! Though I have seen «broken pipe» errors before, this specific situation I’m referring to seems completely isolated. Like this: «2022-04-03 02:35:49,428: OSError: write error» with nothing related to the error above or below it, just that one line. Repeats every once in a while, but I’ve only had it happen twice after posting that, so it’s not as frequent as before. Which. I upgraded my CPU seconds allowance since that post so you’re probably still right actually, I think I was in the tarpit at the time.

I think it could still be the site running slowly — or even just super-impatient people not waiting more than a second for a page, or people viewing the site from bad internet connections (where they might make a request, and then disconnect milliseconds later as their cellphone drops out of coverage).

TBH if you’re just seeing very rare errors like that, but aren’t seeing any complaints from people using your site, you can probably just treat it as «bad weather» — random noise in the logs due to the unreliability of the internet.

Oh, that’s probably it actually. One of my pages takes a couple seconds to load sending information, maybe users are just being impatient and slapping refresh mid-write. That would make a lot of sense come to think of it, especially since i haven’t gotten any complaints about it. Thanks for the help, you rock!

That would make sense, yes — glad we could help!

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Forums

many OSError: write error in web app error log

I’m getting this error 5-6 times a day on my web error log:

Sometimes my app loads immediately, 2-3 seconds; sometimes it’s taking more like 12-13 seconds.

Any ideas how to fix this? FWIW it’s georgiaelectiontwitter.com

Normally that means that someone connected to your site, a page started loading, and then they disconnected before the page was sent back to them. That can happen for a number of reasons; a few a day on a reasonably popular site might just mean that a couple of people were visiting the page using mobile networks, or some other relatively unreliable connection, and they dropped out of coverage in between clicking on a link and your site sending the page back. If you get a very large number (which it doesn’t sound like you do) then it could be a sign that your site is running very slowly and people are getting impatient and going away while waiting for a page to load.

I’ve checked your site’s resource usage, and it does not look like its worker processes are overloaded with requests, so that’s good news — you don’t need to upgrade anything.

But the variation in page load speed sounds a bit odd. Which database are you using, if any — SQLite, MySQL or Postgres?

I too am hella-puzzled by the different load times.

And lol no my site is not popular by any means. Not a lot of traffic. But I’ve had more than one user say it takes 12-13 seconds to load. (I reckon those folks are clicking away and causing the write error) And I’ve had more than one say it’s basically immediate. For my own self too, the experience is mixed. Sometimes quick sometimes slow.

Maybe 2-3 days ago, I was trying to reload my app . I thought that would help. Sometimes the reload would time out. And a very few times when I tried to open the site in the browser, I got PA error page that said «Error Code: 502 backend»

Oh wait i just saw this on another thread; perhaps this is my problem:

SQLite firstly only allows one process to access it at any one time (which would explain why it’s slowing down other views), and secondly performs pretty badly when using networked filesystems like the one on PythonAnywhere, which would explain why it’s slow itself.

My app is just querying a database I have sitting in a directory, output.db

Yes, that does sound like it would be the problem — SQLite is a great database when you’re getting started, but it does become problematic if you’ve got concurrent users, especially if the database starts getting large. MySQL works much better, especially on PythonAnywhere.

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Forums

URGENT: OSError: write error, SIGPIPE and uwsgi_response_writev_headers_and_body_do()

Hi, My site: www.jung.gg Has blown up on Reddit (https://www.reddit.com/r/leagueoflegends/comments/fdf1hr/a_new_analytics_site_for_popular_challenger/) and now I am getting the following errors:

2020-03-04 20:58:10,391: OSError: write error 2020-03-04 20:56:44 Wed Mar 4 20:56:44 2020 — SIGPIPE: writing to a closed pipe/socket/fd (probably the client disconnected) on request /result (ip 10.0.0.249) . 2020-03-04 20:56:44 Wed Mar 4 20:56:44 2020 — uwsgi_response_writev_headers_and_body_do(): Broken pipe [core/writer.c line 306] during POST /result (10.0.0.249)

Any urgent help would be appreciated!

That happens when a client disconnects while a response is being sent. If your website is experiencing high traffic and your views take a long time to render, then you may not have enough workers to handle the load, so requests spend a long time in the queue waiting for an available worker, so the users just see the page loading and leave the site.

Hello, so I’m also encountering similar problem while running my website. I hit API from my website and it will run a loop for 15 iterations, and then the web will display the processed data from the API. The data will be sent to MySQL database before displayed on the web. But I always get this message on my server logs when I hit the API and the error page is also appearing on my site, though all the data from 15 iterations are successfully transferred to the database.

But when I change the iteration on my API to 9 or 10 iteration, my website runs fine without showing the error page. Can anyone please help me fix this? Thank you

That message means that the client disconnected before the response has been effectively sent back. It’s not necessarily an error, rather a symptom. If you don’t want to see such messages in the logs, you may try to make processing in your app shorter (if they are caused by a short timeout on the client side) , but you can always get such message from time to time if the client disconnects.

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Forums

OSError: write error in error.log

I see a lot of «OSError: write error» message in my error log. Been there for weeks.

I’m not getting any errors in my app although I am writing data to disk to cache it.

Is this coming from the server level? It appears so.

Should I be concerned? Any insight as to the source of the error?

We had some trouble with networking on AWS that meant that one of our fileservers was slow. That may have affected your web app. It appears to be working now, so if your web app is still having trouble then it may be something else.

The app seems completely fine and I’m not getting an exceptions, etc. This seems to be coming from the server. Really the only impact seems to be that it is cluttering the log but if it is actually coming from my app that would be great to know.

Are they appearing alongside GeneratorExit messages? If so, this help page should explain what’s going on.

Thanks, no. Just the OSError: write error message. Here’s an excerpt:

Interesting. Is it correlated with slow requests at the same time in the access log? Each request handled by your site has one line there, and at the end of the line there will be a response time.

Thanks for the suggestion. I spot checked a few from Dec 02 (errors vs. access log) and some but not all of them correlate to longer requests. I am requesting data from an API that can take up to three seconds to respond, so my requests are occasionally that long.

During the longer requests I cache the results to disk and do a bunch of stuff with zero length files to provide locking functionality. I have some exception handling in there that could be hiding some errors. They all cover pretty obscure cases (lock file didn’t exist but another process created between the check and the touch with exist_ok=False). Given my traffic volume, I don’t expect there would be very many collisions.

In any event I have added debug messages to those three exception handlers to see if they correlate to the messages in the error log.

If so sorry for the hassle! I will let you know either way.

OK — looking forward to hearing the results of your investigations!

It does not appear that the failed touch nor other exceptions are causing the message. As far as I can tell this doesn’t originate from my code, but I could certainly be missing something.

Here’s what I did:

• Turned on a lot of log / debug messages.
• Generated 12 requests / sec of test traffic to the site.
• I can see the various scenarios getting exercised in the code, including the failed touch call and related exception handling that I was suspicious of.
• I let the test traffic run for maybe 10 minutes. This generated approximately 7,000 requests (some take longer). On a given day the site only receives 300 — 700 page views so this was a good test.
• Checked the error log and didn’t find any «OSError: write error» messages. I did see one from earlier but none during the test period.

Note also that for normal users I don’t do anything unique to their identity (I do basic auth for admin functions only). So generating traffic this way should be a fair simulation of normal traffic.

If it’s not coming from your code, it could be coming from the uWSGI middleware — that’s certainly where the OSError: write error messages combined with GeneratorExit messages that I mentioned earlier come from.

Maybe we can see if it’s just a different symptom of the same cause? If you were to make a request to the site with a super-short timeout — perhaps pick the slowest view — maybe we could see if the same error appears:

I created a test script with a short timeout and ran it along side my test traffic generator. I caught the timeout exceptions and printed them. I can see a lot of timeouts.

I do see a lot of » OSError: write error». Apparently they are coming from the client timeouts.

In the sever log I see the result of the timeout with errors like the ones below. I understand and expect these.

The strange thing I see a lot more ‘write error’s vs. the ‘writing to closed pipe’ errors above on my production site but now that I know what I am looking for I can find those that are there.

Thanks for your help tracking this down! I was fixated on this being a disk error. Didn’t think about pipes / client disconnects.

Excellent, glad you were able to get to the bottom of it!

I have in server log:

In error log:

Also all my SQLite databases on pythonanywhere storage are locked (return apsw.BusyError: BusyError: database is locked when my Django website or scheduled task are trying to execute sql). The only way to unlock them: delete databases’ files and re-upload to the same folders again.

Everything worked fine before 28-03-2019 21:00. It was not any changes in my own code. Any suggestions?

I am seeing tons of these errors in my logs suddenly. Started around Fri Mar 29 15:27:37. Happened around the time performance issues arose on both my site and and their admin pages. Maybe networking issues on their side??

hi there, I believe we corresponded over twitter. We had some performance problems on one of our servers. It should have recovered by now. We are investigating regarding root causes, and how to monitor and be alerted sooner etc.

I am getting this, the request says pending and then times out after 4 secs (I think that it times out because the max request time is 4 secs) I have good wifi, why am I getting an OSError: write error

The only timeout we have on our side is one of several minutes for website views. What URL are you getting the four-second timeout on?

Is there any way to disable logging of OSError: write error ? The whole my log looks like this:

I can not see any useful information in my logs because they are totally overloaded with this error caused by one of my client’s connection. Everything is okay with my website responses.

You get that error when the client that is trying to reach your web app disconnects before the response has been fully sent. We have no way to disable it.

If you’re getting it after 4 seconds, then the client has a 4 second timeout set.

Same for me if i am trying to invoke any API getting «OSError: write error» in error.log, even the API is working fine from other server

You’re not clear on what you mean by invoke an API. Do you mean that you’re calling an API from your web app code or do you mean that you are treating your web app as an API and using a program to access it?

I had created an app for API and using the other app i am trying to call that.

Are you trying to access a URL on your site from inside a view on the same site? That will not work with a free account; you have just one process handling all requests to your site, which means that if it is busy handling one request, other requests will be queued up until it has finished handling it — so if it makes a request back to itself, that second request will be queued and never handled.

I have the same problem «OSError: write error in error.log» during the POST request of a form. The form takes 2 files and the error occurs when I use large files. Do I need to change the UWSGI configuration or something like that?

How large are the files in question? How long is the page taking to return a response?

Are excel files with something like 100k rows each one for example. Those files may have like 15MB. I have upgraded my account, I have now 4 workers and I’m fixing the code in order to work with multiple workers expecting that it solves the problem. Am I going in a bad way?

No, writing your code so it can handle multiple workers is not a bad way to go. It may or may not solve the problem depending on what is actually causing the problem.

I have updated the code and it looks like it works better with more workers, but I have other problem now. Should I open a new thread on the forum? This is the error log:

2020-11-13 09:15:24 Fri Nov 13 09:15:23 2020 — * * HARAKIRI ON WORKER 4 (pid: 27, try: 1) * *

2020-11-13 09:15:24 Fri Nov 13 09:15:23 2020 — HARAKIRI . worker 4 status .

2020-11-13 09:15:24 Fri Nov 13 09:15:23 2020 — HARAKIRI [core 0] 10.0.0.124 — POST /process/start/ since 1605258322

2020-11-13 09:15:24 Fri Nov 13 09:15:23 2020 — HARAKIRI . end of worker 4 status .

I have tested it locally and it works perfectly doing the same test.

Just in case: I’m working on my other account (user: DonLarry)

Those happen when you have a request that takes more than 5 min to respond. In that case, the worker will be killed and restarted. Check the endpoint ( /process/start ) to see why that was taking more than 5 min and work out how you can reduce its response time to below 5 min.

I have the same error. please how can I fix it?

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загрузил телеграм эхо бота на pythonanywhere
выдает ошибку

(venv) 08:28 ~/bott $ python bot1.py 
Goodbye!
Traceback (most recent call last):
  File "/home/akshin17/venv/lib/python3.8/site-packages/aiohttp/connector.py", line 969, in _wrap_create_connection
    return await self._loop.create_connection(*args, **kwargs)  # type: ignore  # noqa
  File "/usr/lib/python3.8/asyncio/base_events.py", line 1017, in create_connection
    raise exceptions[0]
  File "/usr/lib/python3.8/asyncio/base_events.py", line 1002, in create_connection
    sock = await self._connect_sock(
  File "/usr/lib/python3.8/asyncio/base_events.py", line 916, in _connect_sock
    await self.sock_connect(sock, address)
  File "/usr/lib/python3.8/asyncio/selector_events.py", line 485, in sock_connect
    return await fut
  File "/usr/lib/python3.8/asyncio/selector_events.py", line 490, in _sock_connect
    sock.connect(address)
OSError: [Errno 101] Network is unreachable

The above exception was the direct cause of the following exception:
Traceback (most recent call last):
  File "/home/akshin17/venv/lib/python3.8/site-packages/aiogram/bot/api.py", line 139, in make_request
    async with session.post(url, data=req, **kwargs) as response:
  File "/home/akshin17/venv/lib/python3.8/site-packages/aiohttp/client.py", line 1117, in __aenter__
    self._resp = await self._coro
  File "/home/akshin17/venv/lib/python3.8/site-packages/aiohttp/client.py", line 520, in _request
    conn = await self._connector.connect(
  File "/home/akshin17/venv/lib/python3.8/site-packages/aiohttp/connector.py", line 535, in connect
    proto = await self._create_connection(req, traces, timeout)
  File "/home/akshin17/venv/lib/python3.8/site-packages/aiohttp/connector.py", line 892, in _create_connection
    _, proto = await self._create_direct_connection(req, traces, timeout)
  File "/home/akshin17/venv/lib/python3.8/site-packages/aiohttp/connector.py", line 1051, in _create_direct_connection
    raise last_exc
  File "/home/akshin17/venv/lib/python3.8/site-packages/aiohttp/connector.py", line 1020, in _create_direct_connection
    transp, proto = await self._wrap_create_connection(
  File "/home/akshin17/venv/lib/python3.8/site-packages/aiohttp/connector.py", line 975, in _wrap_create_connection
    raise client_error(req.connection_key, exc) from exc
aiohttp.client_exceptions.ClientConnectorError: Cannot connect to host api.telegram.org:443 ssl:default [Network is unreachable]
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "bot1.py", line 21, in <module>
    executor.start_polling(dp, skip_updates=True)
  File "/home/akshin17/venv/lib/python3.8/site-packages/aiogram/utils/executor.py", line 41, in start_polling
    executor.start_polling(reset_webhook=reset_webhook, timeout=timeout, relax=relax, fast=fast)
  File "/home/akshin17/venv/lib/python3.8/site-packages/aiogram/utils/executor.py", line 309, in start_polling
    loop.run_until_complete(self._startup_polling())
  File "/usr/lib/python3.8/asyncio/base_events.py", line 608, in run_until_complete
    return future.result()
  File "/home/akshin17/venv/lib/python3.8/site-packages/aiogram/utils/executor.py", line 360, in _startup_polling
    await self._welcome()
  File "/home/akshin17/venv/lib/python3.8/site-packages/aiogram/utils/executor.py", line 350, in _welcome
    user = await self.dispatcher.bot.me
  File "/home/akshin17/venv/lib/python3.8/site-packages/aiogram/bot/bot.py", line 29, in me
    setattr(self, '_me', await self.get_me())
  File "/home/akshin17/venv/lib/python3.8/site-packages/aiogram/bot/bot.py", line 217, in get_me
    result = await self.request(api.Methods.GET_ME, payload)
  File "/home/akshin17/venv/lib/python3.8/site-packages/aiogram/bot/base.py", line 208, in request
    return await api.make_request(self.session, self.server, self.__token, method, data, files,
  File "/home/akshin17/venv/lib/python3.8/site-packages/aiogram/bot/api.py", line 142, in make_request
    raise exceptions.NetworkError(f"aiohttp client throws an error: {e.__class__.__name__}: {e}")
aiogram.utils.exceptions.NetworkError: Aiohttp client throws an error: ClientConnectorError: Cannot connect to host api.telegram.org:443 ssl:default [Network is u
nreachable]

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