[iceberg] Retry transient REST DNS failures - #9903
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Purpose
Retry Iceberg REST catalog DNS lookup failures with configurable exponential backoff. Five retries with a one-second initial delay are used by default; setting
metadata.iceberg.unknown-host-retry.max-retriesto0preserves immediate failure. Exhausted retries still propagate so publication cleanup and durable recovery remain safe.Tests
mvn -o -Ppaimon-iceberg,fast-build -pl paimon-iceberg -DwildcardSuites=none -Dtest=IcebergRestMetadataCommitterTest testAll 30 tests passed, including transient recovery, exponential delay, disabled retries, exhaustion, and non-DNS failures. Generated configuration documentation was refreshed with
mvn -o package -Pgenerate-docs -pl paimon-docs -DskipTests.