Michaël Figuière created CASSANDRA-5714: -------------------------------------------
Summary: Allow coordinator failover for cursors Key: CASSANDRA-5714 URL: https://issues.apache.org/jira/browse/CASSANDRA-5714 Project: Cassandra Issue Type: Improvement Affects Versions: 1.2.0 beta 1 Reporter: Michaël Figuière Priority: Minor With CASSANDRA-4415 if a coordinator fails or gets slow, causing the {{NEXT}} request to timeout, the client application won't be able to complete its browsing of the result. That implies that most of the time when the developer will rely on cursors he will have to write some logic to handle a retry request for results starting where the iteration failed. This will quickly become painful. Ideally the driver should handle this failover by itself by transparently issuing this retry query when {{NEXT}} fail, but as the driver doesn't understand CQL queries, the only thing it's aware of is the number of rows already read. Therefore we should allow an optional parameter {{<initial_row_number>}} in {{QUERY}} and {{EXECUTE}} messages that would allow a kind of stateless failover of cursors. With such an option, developers wouldn't have to write any failover/retry logic on failure as they would know that everything has already been tried by the driver. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira