Getting error code 204 on App engine PHP + BigQuery

Question

I'm getting this error:

A problem was encountered with the process that handled this request, causing it to exit. 
This is likely to cause a new process to be used for the next request to your application. 
(Error code 204)

I have a PHP app that is mostly using BigQuery. It's very frustrating that I have no way to debug this.

Nothing here helped me.

What can I do?

app id is: logolapp

Update answers to questions from replies

yes, it's still occurring, not every requests, but something like 1/20 requests. It has happened since I started working on this app, which was about a week ago.
in the logs. in the browser i'm just getting 500
it happens randomly for 1/20 requests or so
i'm putting and querying statistical information in BigQuery.

Another update - my app.yaml:

application: logolapp
version: 1
runtime: php55
api_version: 1
threadsafe: true

handlers:
- url: /static
  static_dir: static

- url: /data
  script: data.php

- url: /get/.*
  script: get.php

- url: /query/.*
  script: query.php

- url: /post
  script: post.php

- url: /postidm
  script: main.php

- url: /info
  script: info.php

Can you please try to redeploy the application with the threadsafe value set to false, as this may be related to the cause of your issue. Also, please let me know whether you are using Memcache extensively within your application. — DoiT International
@DoITInternational made the change. so far didn't hit the error, so it looks like it's working. But won't it degrade performance considerably? — Moshe Shaham
I am unaware of threadsafe set to false degrading performance. Threadsafe setting to true would actually slow down the application because you are purposefully making sure requests are handled more or less sequentially to avoid data contention. — DoiT International

DoiT International DoiT International · Accepted Answer · 2016-03-22T19:28:10

There are several possible causes for this issue, one of which is a lack of memory on the instance, which could be resolved by moving memory-intensive processes to a backend instance with more memory, or increasing the instance class of the instances you are using now.

Another possible cause could be a scaling issue. I would need to see the scaling settings in your app.yaml to confirm that, however.

Finally, it might be related to the threadsafe being set to true in your app.yaml.Please set the threadsafe to false to make sure GAE is not messing with your code

It would be helpful if you could revise your question and add this information:

Is the issue still occurring for you? When did the issue start?
Is the error showing up in your logs or is it when you attempt to access the application via the browser?
Is the issue happening continuously or in batches? If in batches, how often does it occur?
What are you attempting to do with BigQuery?

Getting error code 204 on App engine PHP + BigQuery

1 Answers