tree f892477c2a02897fa4c203e1197a5ef17ef01b3f
parent 2e40063aae17658138bfaffa2304b5e461e43e30
author Adam Kocoloski <kocolosk@apache.org> 1614741467 -0500
committer Adam Kocoloski <kocolosk@apache.org> 1614741467 -0500

Require subscribers to wait until indexer finishes

This clause allowed a subscriber to start reading a view as soon as the
indexer made it past the sequence of interest. The trouble with that
approach is the resulting view is not directly related to any snapshot
of the underlying DB. Waiting until the indexer finishes allows us to
provide better semantics, where the view observes a consistent snapshot
of the database at some point in time >= the requested sequence.

In order to see this work through the view reader should explicitly set
the read version of FDB to match the commit version introduced by the
indexer, to avoid seeing partial results from a follow-on indexing job.