vtbackup: Retry fetching master position. #5192
Merged
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We've seen that this could get stuck if vtbackup happens to read the
master tablet record while the tablet is unreachable, and then the
tablet comes back up with a different address. This adds a retry that
re-reads the shard and tablet records to pick up any changes in the
master alias or tablet address.
Signed-off-by: Anthony Yeh enisoc@planetscale.com