Hi,
As https://issues.apache.org/jira/browse/HBASE-13347 describes, the FirstKeyValueMatchingQualifiersFilter was deprecated in 2.0 and will be removed in 3.0. Now we need to remove it in 3.0 but there are proto declareation of FirstKeyValueMatchingQualifiersFilter in Filter.proto. If the proto declaration of FirstKeyValueMatchingQualifiersFilter is removed, serialization problems and unknown errors may occur when the old version of hbase-client accesses the new version of the server, which may puzzle users. Should we remove the proto declaration directly? Or throw RuntimeException when the user uses FirstKeyValueMatchingQualifiersFilter? Hope to get your suggestions. Thanks, Zhuoyue Huang
