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From "Stefan Podkowinski (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-12888) Incremental repairs broken for MVs and CDC
Date Wed, 09 Nov 2016 14:49:59 GMT
Stefan Podkowinski created CASSANDRA-12888:

             Summary: Incremental repairs broken for MVs and CDC
                 Key: CASSANDRA-12888
             Project: Cassandra
          Issue Type: Bug
          Components: Streaming and Messaging
            Reporter: Stefan Podkowinski
            Priority: Critical

SSTables streamed during the repair process will first be written locally and afterwards either
simply added to the pool of existing sstables or, in case of existing MVs or active CDC, replayed
on mutation basis:

We have a special path for views and for CDC.

For views, since the view requires cleaning up any pre-existing state, we must put all partitions
through the same write path as normal mutations. This also ensures any 2is are also updated.

For CDC-enabled tables, we want to ensure that the mutations are run through the CommitLog
so they can be archived by the CDC process on discard.

Using the regular write path turns out to be an issue for incremental repairs, as we loose
the {{repaired_at}} state in the process. Eventually the streamed rows will end up in the
unrepaired set, in contrast to the rows on the sender site moved to the repaired set. The
next repair run will stream the same data back again, causing rows to bounce on and on between
nodes on each repair.

See linked dtest on steps to reproduce. An example for reproducing this manually using ccm
can be found [here|]

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