andygrove commented on issue #6057:
URL:
https://github.com/apache/datafusion-comet/issues/6057#issuecomment-5762672083
Understood: a transient Maven Central failure, not a regression.
The run died in `Spark SQL Tests (Spark 4.0) / Build Native + JVM Test
Classes`, in the `Pre-compile Spark Test classes` step, while sbt was still
loading Spark's project definition:
```
[info] loading project definition from .../apache-spark/project
[error] sbt.librarymanagement.ResolveException: Error downloading
com.typesafe:mima-core_2.12:1.1.4
[error] download error: Caught java.net.SocketException (Connection reset)
while downloading
https://repo1.maven.org/maven2/com/typesafe/mima-core_2.12/1.1.4/mima-core_2.12-1.1.4.pom
```
`mima-core` is a dependency of Spark's own MiMa sbt plugin. Coursier took a
connection reset from Maven Central, reported "not found" against the Ivy
fallback repositories, and gave up. No Spark source had been compiled yet, and
nothing in Comet is involved.
Evidence that it was transient rather than a code problem:
- Spark 3.5's identical build job in the same run passed, as did all three
Iceberg native builds and the full PR Build matrix.
- The next nightly, run 35569123994 on 2026-09-21 against the same `main`,
was green.
- `Required Checks` failed only as the aggregator behind the one red job.
Filed #6078 to add a resolution-failure retry to that step, since `./mvnw`
downloads already get one via `.github/actions/maven-bootstrap` but the sbt
path does not. Closing this one.
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