linqigeng created FLINK-35547:
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             Summary: Sources support HybridSource implements
                 Key: FLINK-35547
                 URL: https://issues.apache.org/jira/browse/FLINK-35547
             Project: Flink
          Issue Type: New Feature
          Components: Flink CDC
            Reporter: linqigeng


Since the specifications of slave instances are generally smaller than the 
primary instance, it is more likely to restart when encountering performance 
bottlenecks(e.g. CPU,memory,disk), and there is a certain delay with the 
primary instance. In order not to affect the running Flink CDC jobs and improve 
effectiveness, here is an idea:

Sources adapt HybridSouce, so we can do like:
 * in the snapshot stage , readers fetch data from the slave instances
 * after the snapshot phase ends, switches to reading binlog from the primary 
instance



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