### What changes were proposed in this pull request? Support Flink 2.1. ### Why are the changes needed? Flink 2.1 has already released, which release notes refer to [Release notes - Flink 2.1](https://nightlies.apache.org/flink/flink-docs-master/release-notes/flink-2.1). ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? CI. Closes #3404 from SteNicholas/CELEBORN-2093. Authored-by: SteNicholas <programgeek@163.com> Signed-off-by: SteNicholas <programgeek@163.com> |
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