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From "Sylvain Lebresne (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-11075) Consider making SASI the default index implementation
Date Wed, 27 Jan 2016 09:36:39 GMT
Sylvain Lebresne created CASSANDRA-11075:

             Summary: Consider making SASI the default index implementation
                 Key: CASSANDRA-11075
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Sylvain Lebresne

We now have 2 secondary index implementation in tree: the old native ones and SASI. Moving
forward, that feels like one too much to maintain, especially since it seems that SASI is
an overall better implementation.

So we should gather enough data to decide if SASI is indeed always better (or at least sufficiently
better than we're convinced no-one would want to stick with the native implementation), and
if that's the case, we should consider making it the default (and ultimately get rid of the
current implementation).

So first, we should at least:
# double check that SASI handles all cases that the native implementation handles. A good
start would probably be run all our dtest and utests on a version where SASI is hard-coded
as default.
# compare the performance of SASI and native indexes. In particular our native indexes, in
all their weaknesses, have the advantage of not doing a read-before-write. Haven't looked
at SASI much so I don't know if it's the case but anyway, we need numbers on both reads and

Once we have that, if we do decide to make SASI the default, then we need to figure out what
is the upgrade path (and whether we add extra syntax for SASI specific options).

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