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https://issues.apache.org/jira/browse/CASSANDRA-10813?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Tolbert updated CASSANDRA-10813:
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Description:
I'm not sure how attainable this is, but it would be very convenient to know
whether or not a statement that is prepared is idempotent. If at all possible
it would be nice to add a bit to flags that communicates this in a future
protocol version.
This would be useful for client library implementors for making decisions based
on whether or not a query is idempotent. For example, if a connection fails
while a request is in flight, you can't be sure whether or not a write mutation
was applied or not. If the write query was idempotent and client timestamps
were used, you can feel comfortable simply retrying the request. The datastax
drivers have the capability of specifying whether or not a query is idempotent
manually, but it would be nice if C* could tell us whether or not a query is
idempotent at prepare time (if it all possible) instead of depending on the
user to tell us.
was:
I'm not sure how attainable this is, but it would be very convenient to know
whether or not a statement that is prepared is idempotent. If at all possible
it would be nice to add a bit flags that communicates this in a future protocol
version.
This would be useful for client library implementors for making decisions based
on whether or not a query is idempotent. For example, if a connection fails
while a request is in flight, you can't be sure whether or not a write mutation
was applied or not. If the write query was idempotent and client timestamps
were used, you can feel comfortable simply retrying the request. The datastax
drivers have the capability of specifying whether or not a query is idempotent
manually, but it would be nice if C* could tell us whether or not a query is
idempotent at prepare time (if it all possible) instead of depending on the
user to tell us.
> Add 'idempotent' flag to 'PREPARED' response
> --------------------------------------------
>
> Key: CASSANDRA-10813
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10813
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Andy Tolbert
> Priority: Minor
>
> I'm not sure how attainable this is, but it would be very convenient to know
> whether or not a statement that is prepared is idempotent. If at all
> possible it would be nice to add a bit to flags that communicates this in a
> future protocol version.
> This would be useful for client library implementors for making decisions
> based on whether or not a query is idempotent. For example, if a connection
> fails while a request is in flight, you can't be sure whether or not a write
> mutation was applied or not. If the write query was idempotent and client
> timestamps were used, you can feel comfortable simply retrying the request.
> The datastax drivers have the capability of specifying whether or not a query
> is idempotent manually, but it would be nice if C* could tell us whether or
> not a query is idempotent at prepare time (if it all possible) instead of
> depending on the user to tell us.
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