leventov commented on a change in pull request #6629: Add support parallel
combine in brokers
URL: https://github.com/apache/incubator-druid/pull/6629#discussion_r239494655
##########
File path: processing/src/main/java/org/apache/druid/query/QueryContexts.java
##########
@@ -174,6 +179,35 @@
}
}
+ private static int checkPositive(String propertyName, int val)
+ {
+ Preconditions.checkArgument(
+ val > 0,
+ "%s should be positive, but [%s]",
+ propertyName,
+ val
+ );
+ return val;
+ }
+
+ /**
+ * Return the configured number of combine threads if any. Others {@link
#NO_PARALLEL_COMBINE_THREADS}.
+ */
+ public static <T> int getNumBrokerParallelCombineThreads(Query<T> query)
+ {
+ return parseInt(query, NUM_BROKER_PARALLEL_COMBINE_THREADS,
NO_PARALLEL_COMBINE_THREADS);
Review comment:
Is it possible to manage processing resources so that there is confidence
that even if parallel combine is enabled for all queries, it doesn't make
things much worse (but parallelization overhead is acceptable, e. g. within 10%
of regression in the most unfavourable cases)?
Is it possible to estimate the size of intermediate aggregates and enable
parallel combine automatically when it begins to make sense?
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