read repair mentioned in data stax documentation differs mentioned in apache cassandra documentation for consistency level one

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mishra.anurag643_153409 asked · Jan 06 at 06:07 PM

read repair mentioned in data stax documentation differs mentioned in apache cassandra documentation for consistency level one

in datastax documentation it is mentioned read repair happens for consistency level one , even there is one quiz on this in DS-201 . I have attached image for that .

below link is from apache cassandra :

https://cassandra.apache.org/doc/latest/operating/read_repair.html

please refer screenshot attached below and notice highlighted part .

also in apache cassandra documentation it is mentioned . "If read repair is performed it is made only on the replicas that are not up-to-date and that are involved in the read request. The number of replicas involved in a read request would be based on the read consistency level ."

above line stats that only those many replicas are checked in numbers as the per the consistency level set . So if consistency level is set to ONE . Only one replica will be checked and data will be sent to client .

read repair

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Answer 1 · 2021-01-06T21:02:33Z

Erick Ramirez answered · Jan 06 at 09:02 PM

Read repair does not take place for consistency of ONE or LOCAL_ONE.

It's interesting that you claim the docs state otherwise but you didn't provide the link so I don't know what you're referring to. Cheers!

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