[jira] [Created] (CASSANDRA-12245) initial view build can be parallel

["Tom van der Woerdt (JIRA)" <ji...@apache.org>]

Tom van der Woerdt created CASSANDRA-12245:
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             Summary: initial view build can be parallel
                 Key: CASSANDRA-12245
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12245
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Tom van der Woerdt


On a node with lots of data (~3TB) building a materialized view takes several weeks, which is not ideal. It's doing this in a single thread.

There are several potential ways this can be optimized :
 * do vnodes in parallel, instead of going through the entire range in one thread
 * just iterate through sstables, not worrying about duplicates, and include the timestamp of the original write in the MV mutation. since this excludes duplicates it does increase the amount of work and could temporarily surface ghost rows (yikes) but I guess that's why they call it eventual consistency. doing it this way can avoid holding references to all tables on disk, allows parallelization, and removes the need to check other sstables for existing data. this is essentially the 'do a full repair' path



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