torwig opened a new pull request, #1251: URL: https://github.com/apache/incubator-kvrocks/pull/1251
Syntax: `XLEN stream_name [entry_id] [direction]`. Where direction can be '-' or '+' (special IDs mean respectively the first and the last elements in the stream). Default value: '+'. If an optional entry ID is specified, the XLEN command returns the number of entries between that ID and the first/last element of the stream. The element with the specified ID is not considered - it serves as an exclusive boundary. If the stream doesn't contain an entry with the specified ID, the command starts counting from the closest entry to the first/last element in the stream. If the specified ID is equal to or greater than the last entry ID and: a) direction is '+' - the command returns 0 b) direction is '-' - the command returns the stream's size If the specified ID is equal to or less than the first entry ID and: a) direction is '-' the command returns 0 b) direction is '+' the command returns stream's size This feature is helpful in finding: a) how many entries in the stream were processed so far b) how many unprocessed entries (ahead of the current one) are in the stream Complexity: O(n) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
