msawyer-palantir opened a new issue, #13733:
URL: https://github.com/apache/iceberg/issues/13733
### Apache Iceberg version
1.9.2 (latest release)
### Query engine
Spark
### Please describe the bug 🐞
The main issue is that `VendedAdlsCredentialProvider` tries to call
`Mono#block` even if in an async context, causing:
```
Caused by: java.lang.IllegalStateException: block()/blockFirst()/blockLast()
are blocking, which is not supported in thread parallel-1
at
reactor.core.publisher.BlockingSingleSubscriber.blockingGet(BlockingSingleSubscriber.java:83)
at reactor.core.publisher.Mono.block(Mono.java:1742)
at
org.apache.iceberg.azure.adlsv2.VendedAdlsCredentialProvider.credentialForAccount(VendedAdlsCredentialProvider.java:78)
at
org.apache.iceberg.azure.adlsv2.VendedAzureSasCredentialPolicy.maybeUpdateCredential(VendedAzureSasCredentialPolicy.java:58)
at
org.apache.iceberg.azure.adlsv2.VendedAzureSasCredentialPolicy.process(VendedAzureSasCredentialPolicy.java:46)
at
com.azure.core.http.HttpPipelineNextPolicy.process(HttpPipelineNextPolicy.java:81)
at
com.azure.storage.common.policy.MetadataValidationPolicy.process(MetadataValidationPolicy.java:45)
at
com.azure.core.http.HttpPipelineNextPolicy.process(HttpPipelineNextPolicy.java:81)
at
com.azure.core.http.policy.AddDatePolicy.lambda$process$0(AddDatePolicy.java:43)
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:45)
... 12 more
```
But there are also other concurrency issues around that code which often
lead to e.g. CMEs, e.g. the use of `HashMap#computeIfAbsent` by multiple
threads at once.
### Willingness to contribute
- [x] I can contribute a fix for this bug independently
- [ ] I would be willing to contribute a fix for this bug with guidance from
the Iceberg community
- [ ] I cannot contribute a fix for this bug at this time
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