@Override
    public void putSafe(final ConnectorStatus status) {
        sendConnectorStatus(status, true);
    }
StatusBackingStore implementation which uses a compacted topic for storage
of connector and task status information. When a state change is observed,
the new state is written to the compacted topic. The new state will not be
visible until it has been read back from the topic.
<p>
In spite of their names, the {@link #putSafe} methods cannot guarantee the safety
of the write (since Kafka itself cannot provide such guarantees currently),
but it can avoid specific unsafe conditions. In particular, {@link #putSafe}
allows writes in the following conditions:
<ol>
  <li>It is (probably) safe to overwrite the state if there is no previous
  value.
  <li>It is (probably) safe to overwrite the state if the previous value was
  set by a worker with the same workerId.
  <li>It is (probably) safe to overwrite the previous state if the current
  generation is higher than the previous .
</ol>
Basically all these conditions do is reduce the window for conflicts. They
obviously cannot take into account in-flight requests.
connect/runtime/src/main/java/org/apache/kafka/connect/storage/KafkaStatusBackingStore.java