manual checkpoint

Description
===========
I am using 2 process to read from kafka and write to destination (design of ELT tool) hence, I would like to maintain checkpoint/offset manually and read it from where it left on last run . however, it is reading old record i.e last checkpoint record.

How to reproduce
================

def _reset_offset_(self, consumer, partitions):
"""
set the topic starting point
"""
for p in partitions:
name = str(p.partition)
if name in self.state_update:
p.offset = self.state_update[name] ## from checkpoint lookup
else:
p.offset = OFFSET_BEGINNING
consumer.assign(partitions)

self.consumer.subscribe([self.topic], on_assign=self._reset_offset_)

It always return last read record on next run. I would like to skip and read only next record from last checkpoint.