Thank you!
The 2nd link you sent is very very good description! I recommend for
others too (who might run into this question via mail archive search
later...)
In my opinion it explains the entire problem space regarding how LWTs
are working while also putting them into the context of "consistency
level" / different phases of LWT very well.
Yesterday I was searching / reading at least 15 different articles +
docs - none of them answered my questions (and I just had more and more
as progressing with reading) entirely - this one is a nice one!
cheers
Attila Wind
http://www.linkedin.com/in/attilaw
Mobile: +49 176 43556932
26.06.2020 08:15 keltezéssel, Erick Ramirez írta:
You are correct. Lightweight transactions perform a read-before-write
[1]. The read phase is performed with a serial consistency which
requires a quorum of nodes in the local DC (LOCAL_SERIAL) or across
the whole cluster (SERIAL) [2].
Quorum of 2 nodes is 2 nodes so RF=2 cannot tolerate a node outage.
Cheers!
[1]
https://www.datastax.com/blog/2019/04/lightweight-transactions-datastax-enterprise
[2]
https://docs.datastax.com/en/cassandra-oss/3.x/cassandra/dml/dmlConfigConsistency.html#dmlConfigConsistency__table-write-consistency
