Critical Description
In AMBARI-22600, we cloned the Filter instance to assign the instance per child thread, which also clones the map of Mapper. Other Mapper implements only have String(s) type of fields hence thread-safe, but MapperDate has SimpleDateFormat type of fields which is known as non thread-safe, so cloning the Filter which has one or more MapperDate and using them concurrently makes multi-threads issue.
For example I'm seeing the logdate improperly stored.
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