Hi all,
A question has come up in our team about the performance impact of
static vs dynamic columns. We'd like to ask two questions:
Quick background: We are using a custom app to write to Cassandra using
Hector. Production is Solaris and pre-prod is generally Centos. We're
currently on 0.7 but will be moving to 1.1 very shortly.
1. Does specifying the type of a column affect performance other than
the cost of validating data as it is stored?
e.g. does it help compaction, etc?
From my reading of the docs the advantage is that the data will be
validated on write and that the various dev tools can deserialize into a
human readable form easily.
2. Is there any impact to mixing static and dynamic columns in the same
column family? (Follow-up question: is this far outside of the
designers' intentions and thus unsafe?)
The docs seem to indicate that the designers think of static column
families and dynamic column families and *not* a mixture of the two.
My mental model is that a column is just a column. It's possible to
specify some metadata about columns for validation and display but
that's about it. Is there something to change this model?
Thanks in advance for any comments.
Cheers,
Edward
--
Edward Sargisson
senior java developer
Global Relay
edward.sargis...@globalrelay.net <mailto:edward.sargis...@globalrelay.net>
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