ericyuan915 opened a new issue, #18981:
URL: https://github.com/apache/hudi/issues/18981
### Bug Description
hudi-flink-bundle bundles org.apache.flink:flink-metrics-dropwizard and
(since #18730) relocates com.codahale.metrics →
org.apache.hudi.com.codahale.metrics in packaging/hudi-flink-bundle/pom.xml,
but does not relocate org.apache.flink.dropwizard.
maven-shade therefore recompiles the bundled
org.apache.flink.dropwizard.metrics.DropwizardHistogramWrapper against the
relocated org.apache.hudi.com.codahale.metrics.Histogram, while leaving the
class at its original FQN. The shaded jar thus exposes a
DropwizardHistogramWrapper whose only constructor is
(org.apache.hudi.com.codahale.metrics.Histogram). Any app with both
hudi-flink-bundle and the real flink-metrics-dropwizard on the classpath can
resolve the shaded copy. Standard code then fails at runtime:
metricGroup.histogram("latency", new DropwizardHistogramWrapper(new
com.codahale.metrics.Histogram(new SlidingWindowReservoir(500))));
**Expected**: the bundle should not place an un-relocated
DropwizardHistogramWrapper (compiled against shaded codahale) at the real Flink
FQN; consumers of the real flink-metrics-dropwizard should be unaffected.
**Root cause**: #18730 added the codahale relocation without relocating the
Flink dropwizard bridge. Fix: add a sibling relocation
org.apache.flink.dropwizard → org.apache.hudi.org.apache.flink.dropwizard. PR
to follow.
### Environment
**Hudi version:** master (1.3.0-SNAPSHOT) — present since #18730
(2026-05-15); not in 1.2.0 or earlier
**Query engine:** Flink (e.g. hudi-flink1.18-bundle)
**Relevant configs:** hudi-flink-bundle (all Flink versions built from
packaging/hudi-flink-bundle/pom.xml)
### Logs and Stack Trace
java.lang.NoSuchMethodError: 'void
org.apache.flink.dropwizard.metrics.DropwizardHistogramWrapper.<init>(com.codahale.metrics.Histogram)'
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