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https://issues.apache.org/jira/browse/FLINK-2973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16246432#comment-16246432
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Greg Hogan commented on FLINK-2973:
-----------------------------------
[~fhueske] it looks to be GPLv2 (with classpath exception):
http://hg.openjdk.java.net/jdk9/jdk9/file/a08cbfc0e4ec/LICENSE
> Add flink-benchmark with compliant licenses again
> -------------------------------------------------
>
> Key: FLINK-2973
> URL: https://issues.apache.org/jira/browse/FLINK-2973
> Project: Flink
> Issue Type: Task
> Components: Build System
> Affects Versions: 1.0.0
> Reporter: Fabian Hueske
> Assignee: Suneel Marthi
> Priority: Minor
> Fix For: 1.0.0
>
>
> We recently created the Maven module {{flink-benchmark}} for micro-benchmarks
> and ported most of the existing micro-benchmarks to the Java benchmarking
> framework JMH. However, JMH is part of OpenJDK and under GPL license which is
> not compatible with the AL2.
> Consequently, we need to remove this dependency and either revert the porting
> commits or port the benchmarks to another benchmarking framework. An
> alternative could be [Google's Caliper|https://github.com/google/caliper]
> library which is under AL2.
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