Hi all, As per the REST API specification [1], REST API operates in 2 steps.
1. Users will be sending a request which contains the query to be executed. Then the REST API will compile the query and submit to hyracks to be executed. Once submitted, REST API returns a response containing compilations time, Abstract Syntax Tree, Runtime Plan and etc to the user along with a result ID which will later be used to fetch results by the user. 2. User sends a request to the REST API with the *result ID *previously received and the REST API will internally read the results from hyracks corresponding to that result ID. Then return the results to the user. Since there is no link between the time at which user submits the query and the time at which the user reads results, we cannot measure the *time for the query execution*. Previously, this measurement was done by vxquery waiting for hyracks to complete query execution and fetch results. When it comes to AsterixDB, they are using synchronous requests (submit query and wait) in the REST API (Yes, they have an asynchronous version, which doesn't measure execution time correctly since it is using an executor service [2]. see the ASYNC execution path under it). As per my understanding, what I have mentioned above are correct. Am I missing something? If not, what are your thoughts on this scenario? How can we tackle this? [1] https://cwiki.apache.org/confluence/display/VXQUERY/ SwaggerIO+Configuration [2] https://github.com/apache/asterixdb/blob/master/ asterixdb/asterix-app/src/main/java/org/apache/asterix/api/http/server/ QueryServiceServlet.java Thanks and Regards, *Erandi Ganepola* Undergraduate BSc. Management and Information Technology (IT Sp.) University of Kelaniya, Sri Lanka <https://www.linkedin.com/in/erandiganepola/> <https://github.com/erandiganepola> <https://twitter.com/erandiganepola>
