How to fix error 'could not acquire write lock for 'artifact:org.bytedeco:opencv:4.5.5-1.5.7' ?

Question

depes.edn:

{:deps {org.deeplearning4j/deeplearning4j-nlp {:mvn/version "1.0.0-M2.1"}}}

It happened before in an older Clojure version, but disappeared, see here:

https://clojurians-log.clojureverse.org/tools-deps/2021-09-16

Now I have it back with a recent clojure CLI:
1.11.1.1200

The workarround is still to limit the number of download threads;

clj -Sthreads 1

So it only happens to me using (the default) multi-threaded downloading.

Comments

Howdy,

I just want to thank you for the very usable informations shared here, sadly I learned about this only after Maven issue tracker got a link to this forum entry (a week ago or so).

I would like to encourage everyone using (directly or indirectly) maven-resolver to feel free to report issues there: https://github.com/apache/maven-resolver

This thread did introduce me cool stuff like wondershaper (that after all proved unneeded, as other comment pointed me to "big enough" artifacts to create reproducer for this very issue). Thanks

Edit: fix to be expected in Resolver 1.9.25 (and 2.0.14)

Answer 1

I haven't been able to reproduce this and haven't had any other reports from anyone on this for a while, so not going to create a ticket for now.

Comments

I cannot reproduce neither from work, on a fast network.
I will try again from home later, on a slow line.

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I can reproduce it  by limiting the bandwidth of my work machine.

So first running:

sudo wondershaper -a eth0 -d 1024 -u 1024

to limit download bandwith to 1MBit/s

and then starting the clj from latest Clojure Docker image

docker run -ti clojure clj -Sdeps '{:deps {org.deeplearning4j/deeplearning4j-nlp {:mvn/version "1.0.0-M2.1"}}}'


fails with:


Downloading: com/twelvemonkeys/imageio/imageio-bmp/3.1.1/imageio-bmp-3.1.1.jar from central
Downloading: org/bytedeco/javacpp/1.5.7/javacpp-1.5.7-linux-arm64.jar from central
Error building classpath. Could not acquire write lock for 'artifact:org.bytedeco:leptonica:1.82.0-1.5.7'
java.lang.IllegalStateException: Could not acquire write lock for 'artifact:org.bytedeco:leptonica:1.82.0-1.5.7'
        at org.eclipse.aether.internal.impl.synccontext.named.NamedLockFactoryAdapter$AdaptedLockSyncContext.acquire(N

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Thanks, I think I understand why we're seeing this again and have some things to look at

Answer 2

Logged as https://clojure.atlassian.net/browse/TDEPS-244

Comments

The -Sthreads 1 there is being ignored based on where it is in the command line, so it has no effect, and would have no effect if removed.

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I really think the problem went away with clojure 1.12.5....

I have at home very re-producible scenarios, 100 % failure without "-Sthreads 1", but since a few days, I somehow noticed that I don't need it any more.

Was there any change in latest Clojure, which could have fixed it ?

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The most recent version of the CLI incorporates newer Maven resolver libs where they redid some of the file locking protocols, so that could definitely have an effect.

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I really believe this is solved now with CLI 1.12.5.1654   
My scenarios don't reproduce it any more.

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That is great to hear, thanks for the feedback!