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Read/Write (Functions (CREATE FUNCTION, create function for every node in…
Read/Write
Functions
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if UDF fails, execution of the query is aborted
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Read
- cordinator sent read request to fastest replica
- coordinator send digest request to other replicas
- coordinator calculate digest hash of data from fastest replica
- compare the hash with those returned from digest request,
return latest value
- if not consistent, perform a read repair to update replicas with latest value
SELECT
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ALLOW FILTERING
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not recommended, can make expensive queries
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