Github user asdf2014 commented on a diff in the pull request:
    --- Diff: 
    @@ -24,8 +24,8 @@
     import org.slf4j.Logger;
     import org.slf4j.LoggerFactory;
    -import java.util.HashMap;
    -import java.util.HashSet;
    +import java.util.concurrent.ConcurrentHashMap;
    +import java.util.concurrent.ConcurrentSkipListSet;
    --- End diff --
    Hi, @nicochen . Thank you for the `PR`. There is a import order problem, 
you should change the order of those import as the following code. Otherwise it 
will not pass the `checkstyle` system.
    import java.util.Map;
    import java.util.Set;
    import java.util.concurrent.ConcurrentHashMap;
    import java.util.concurrent.ConcurrentSkipListSet;

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