Is java 21 virtual threads compatible?

[junkfactory]

I am doing R&D with new feature of java 21, particularly virtual threads. We have an multi-threaded app that does large number of puts to an s3 bucket (in batches though). It uses

AsyncRequestBody.fromInputStream(inStream, item.size(), executor) <-- is it safe to use virtual thread per task executor?

in the AwsCrtAsyncHttpClient.putObject() operation. So far testing looks promising but unrealistic to reach production level volume in testing.

One pitfall of virtual threads when they are pinned to carrier thread while waiting for the blocking native code operations. Since CRT interfaces with native code, this crossed my mind.

Would appreciate any insights if anyone came across or see potential problems in this case?

[TingDaoK]

I think the Java SDK team may have a better answer for this.
But, from CRT perspective, all the read from the input stream happens sequentially from one single background native thread, which should be the subscriber of the AsyncRequestBody.
So, from my understanding, the thread the publisher publishes the data should not affect the behavior.

[junkfactory]

Thanks i've asked there too for anyone interested.

My gut feel is its going to pin to an OS thread but could be completely off the left field.