Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/4545#discussion_r133218223
--- Diff: flink-connectors/flink-connector-cassandra/pom.xml ---
@@ -83,6 +85,10 @@ under the License.
<exclude>com.google.inject.**</exclude>
</excludes>
</relocation>
+ <relocation>
+
<pattern>io.netty</pattern>
+
<shadedPattern>org.apache.flink.shaded.netty4.io.netty</shadedPattern>
--- End diff --
you are relocating cassandra indirect netty dependency into the same
namespace as Flink direct netty dependency, which will lead to dependency
conflicts (because the sole way of distinguishing between class veresions, the
package declaration, is identical).
The `shadedPattern` should be `org.apache.flink.cassandra.shaded.io.netty`
instead.
* This is in line with the guava relocation (in the same file).
* the cassandra prefix introduces another layer of uniqueness which makes
dependency conflicts less likely.
* I want to reserve the `org.apache.flink.shaded` namespace for
dependencies from `flink-shaded`, to avoid accidental dependency clashes from
being created (which would have happened had we merged the PR as is)
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