yashmayya commented on code in PR #13628:
URL: https://github.com/apache/pinot/pull/13628#discussion_r1685961517
##########
pinot-broker/src/main/java/org/apache/pinot/broker/requesthandler/BaseSingleStageBrokerRequestHandler.java:
##########
@@ -478,8 +481,17 @@ protected BrokerResponse handleRequest(long requestId,
String query, @Nullable S
}
_brokerMetrics.addMeteredTableValue(rawTableName, BrokerMeter.QUERIES,
1);
+ _brokerMetrics.addMeteredGlobalValue(BrokerMeter.QUERIES_GLOBAL, 1);
_brokerMetrics.addValueToTableGauge(rawTableName,
BrokerGauge.REQUEST_SIZE, query.length());
+ if (!pinotQuery.isExplain() && _enableMultistageMigrationMetric) {
Review Comment:
Thanks for the suggestions! I do agree that we need to be careful about
affecting query latency in the v1 engine due to this additional query
compilation overhead. I liked your second option more because the first option
can still introduce unpredictable latency in some queries which can increase
the tail latency by a fair amount. I did some ad-hoc benchmarking and for some
queries, the v2 engine query compilation time is actually comparable in order
of magnitude to the overall v1 query execution time (and I'm sure in certain
cases it could even be higher).
Also, I'm not a big fan of adding more user configuration than is necessary.
I've gone with the second option for now - background thread processing (v2
query compiling) a queue of v1 query requests where the queue capacity is
currently hardcoded / not configurable. We could make this queue capacity
configurable in the future if we see a need for allowing this to be
configurable by users - i.e., in order to tune the percentage of requests that
are effectively sampled based on the query workload.
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