BELUGA BEHR created HIVE-20258:
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             Summary: Should Syncronize getInstance in ReplChangeManager
                 Key: HIVE-20258
                 URL: https://issues.apache.org/jira/browse/HIVE-20258
             Project: Hive
          Issue Type: Bug
          Components: Metastore
    Affects Versions: 3.0.0, 4.0.0
            Reporter: BELUGA BEHR


{code:java}
  public static ReplChangeManager getInstance(Configuration conf) throws 
MetaException {
    if (instance == null) {
      instance = new ReplChangeManager(conf);
    }
    return instance;
  }
{code}

This method needs to be synchronized or two different callers will see a 'null' 
value and each create their own manager.



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