leventov commented on a change in pull request #8116: remove unnecessary lock
in ForegroundCachePopulator leading to a lot of contention
URL: https://github.com/apache/incubator-druid/pull/8116#discussion_r305977397
##########
File path:
server/src/main/java/org/apache/druid/client/cache/BackgroundCachePopulator.java
##########
@@ -38,6 +38,14 @@
import java.util.concurrent.ExecutorService;
import java.util.function.Function;
+/**
+ * {@link CachePopulator} implementation that uses a {@link ExecutorService}
thread pool to populate a cache in the
+ * background. Used if config "druid.*.cache.numBackgroundThreads" is greater
than 0. If maximum cache entry size,
+ * specified by config "druid.*.cache.maxEntrySize", is exceeded, this {@link
CachePopulator} implementation will
+ * be a bit less efficient than {@link ForegroundCachePopulator} which can
stop retaining values early, in exchange
Review comment:
I don't understand the relation with `maxEntrySize`, again, and what does
"can stop retaining values early" mean. Please reword.
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