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From Wayne Schroeder <>
Subject Re: Lightweight transaction (paxos) vs double check.
Date Wed, 13 Aug 2014 19:28:49 GMT
Well… I didn’t expect them to be free :)

Knowing the price would help weigh the consequences of using them though.  I just don’t
want to implement a check/write/double check solution if it ends up being actually more expensive
in total operations and time than simply using LWT.  Any thoughts in that regard?


On Aug 13, 2014, at 1:10 PM, Robert Coli <<>>

On Wed, Aug 13, 2014 at 9:16 AM, Wayne Schroeder <<>>
Are there hidden costs to LWT (paxos) that are not represented in the total time and number
of operations?  For example, are there some under-the-hood locks that could cause contention
issues when processing significant quantities of LWT under load?

"Transactions" are not the sweet spot of a distributed log structured database with immutable
datafiles, LWT comes at a significant cost compared to other operations in Cassandra.

Put another way, lunch is still not free. :D


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