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Make sure that Postgres always get a consistent snapshot #929

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Make sure that Postgres always get a consistent snapshot #929

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Commits on Apr 19, 2022

  1. Make create_replication_slot return consistent LSN 

    This change ensures that the LSN at which the replication slot is
first consistent is availiable to the caller of the method.
    @judahrand
    judahrand committed Apr 19, 2022
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  2. Refactor fetching current LSN into method

    @judahrand
    judahrand committed Apr 19, 2022
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  3. Add method to get confirmed_flush_lsn

    @judahrand
    judahrand committed Apr 19, 2022
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  4. Ensure that replica is ahead of replication slot 

    There is a replication lag between a primary and replica database.
We get information about what data the replication slot can provide
from the primary but perform the initial data snapshot on the replica.
Therefore, we must make sure that the replica has caught up to at
least the LSN which we are going to begin streaming from the
replication slot.
    @judahrand
    judahrand committed Apr 19, 2022
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  5. Remove unneccesary attributes

    @judahrand
    judahrand committed Apr 19, 2022
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  6. Satisfy Pylint that there aren't too many variables

    @judahrand
    judahrand committed Apr 19, 2022
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  7. Update tests

    @judahrand
    judahrand committed Apr 19, 2022
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  8. Fix call to textwrap.dedent

    @judahrand
    judahrand committed Apr 19, 2022
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  9. Timeout better

    @judahrand
    judahrand committed Apr 19, 2022
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