dcc816427e
It will be useful for future efforts to know if the global checkpoint was updated. To this end, we need to expose whether or not the global checkpoint was updated when the state of the replication tracker updates. For this, we add to the tracker a callback that is invoked whenever the global checkpoint is updated. For primaries this will be invoked when the computed global checkpoint is updated based on state changes to the tracker. For replicas this will be invoked when the local knowledge of the global checkpoint is advanced from the primary. |
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