I think this is the right place to put this issue. Happy to repost if not. <p dir=

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500 GET: missing dask-logo.svg about dask-labextension HOT 6 CLOSED

dask commented on September 16, 2024

500 GET: missing dask-logo.svg

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Comments (6)

mrocklin commented on September 16, 2024

My guess is that Dask labextension queries that address every second to see if a cluster is alive there. If it is then it connects up the existing plots.

My guess is that we might want to wrap up the line that queries that file in whatever the TypeScript equivalent of a try-except block is. It's ok to not find that address.

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mrocklin commented on September 16, 2024

@ian-r-rose is my understanding above correct?

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jhamman commented on September 16, 2024

My understanding is the fetch of this logo is being used to determine if the dashboard is up. So most of the behavior here seems correct, we probably just want to silence the error in some nice way.

dask-labextension/src/widget.tsx

Lines 442 to 453 in 2e743d9

 let logoUrl = URLExt.join(url, 'statics/images/dask-logo.svg'); 

 // Bust caching for src attr 

 // https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest#Bypassing_the_cache 

 logoUrl += (/\?/.test(logoUrl) ? '&' : '?') + new Date().getTime(); 

 let img = document.createElement('img'); 

 img.onload = () => { 

 resolve(true); 

 }; 

 img.onerror = () => { 

 resolve(false); 

 };

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ian-r-rose commented on September 16, 2024

Yes, @mrocklin, your understanding is right. The "logo fetching" has always been a hack, it is checking to see if the dashboard server is up and running while getting around some browser-security policies. I would love to be able to silence those errors, but I am not aware of a way to patch the tornado server to remove them.

@jhamman, I am rewriting the proxying logic in #31, so hopefully a lot of these issues will be solved (or greatly mitigated) there. In particular, once we have stronger guarantees that the cluster will be available under the same origin we will no longer need to check for the logo itself.

I am puzzled as to why it's a 500 error and not a 404, however... are there any other errors you see that might be relevant?

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jhamman commented on September 16, 2024

[E 10:47:50.364 LabApp] 500 GET /proxy/8787/statics/images/dask-logo.svg?1544204869455 (10.148.0.4) 2.54ms referer=http://localhost:8888/lab
[W 10:47:52.458 LabApp] 404 GET /proxy/8787/status/individual-task-stream (10.148.0.4) 17.78ms referer=http://localhost:8888/lab

While futzing about with the app, we did see some 404 errors but they were only triggered by changing urls to the dashboard. These could be related but I think the 404 comes up when the app cant find a dashboard it previously had found. The 500 errors come when the app hasn't found a dashboard at all yet.

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consideRatio commented on September 16, 2024

In a JupyterHub, I end up with the following three different errors in the browsers console log. This is while I'm successfully running stuff against my Dask worker pods through the scheduler etc.

Failed to load resource: net::ERR_NAME_NOT_RESOLVED dask-logo.svg:1

Failed to load resource: net::ERR_NAME_NOT_RESOLVED /user/erik.sundell/dask/clusters?1546445236329:1

Failed to load resource: the server responded with a status of 404 () clusters.js:5

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500 GET: missing dask-logo.svg about dask-labextension HOT 6 CLOSED

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	let logoUrl = URLExt.join(url, 'statics/images/dask-logo.svg');
	// Bust caching for src attr
	// https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest#Bypassing_the_cache
	logoUrl += (/\?/.test(logoUrl) ? '&' : '?') + new Date().getTime();

	let img = document.createElement('img');
	img.onload = () => {
	resolve(true);
	};
	img.onerror = () => {
	resolve(false);
	};