public Delete addFamilyVersion(final byte[] family, final long timestamp) {
    checkTimestamp(ts);
    List<ExtendedCell> list = getCellList(family);
    list.add(new KeyValue(row, family, null, timestamp, KeyValue.Type.DeleteFamilyVersion));
    return this;
  }
Delete all columns of the specified family with a timestamp equal to the specified timestamp.
@param family    family name
@param timestamp version timestamp
@return this for invocation chaining
hbase-client/src/main/java/org/apache/hadoop/hbase/client/Delete.java