Commits on Dec 5, 2019

1. Prevent migration operations running before previous finalization com… …

   …pletes v2
   
   If a node was the source of a backup replica migration
   and then if it becomes the destination of another replica migration
   on the same partition, `MigrationOperation` can be executed before
   the former migration is finalized. Reason is, sources of backup migrations
   are not part of migration transactions and they learn the migration
   only while applying completed migrations.
   
   Previously, when we detect this, we skipped the execution of previous
   migrations finalization to prevent data loss.
   
   But this may cause replica data leak, because of ignored finalization.
   
   This time, migration finalizations are registered before
   they are executed or enqueued. If there's an pending finalization
   while a migration operation is being executed then migration operation
   is rejected with a retryable exception.

   

   mdogan committed Dec 5, 2019
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