lukecwik commented on a change in pull request #16495:
URL: https://github.com/apache/beam/pull/16495#discussion_r787224006
##########
File path:
sdks/java/harness/src/main/java/org/apache/beam/fn/harness/Caches.java
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@@ -165,10 +141,57 @@ public int weigh(Object key, Object value) {
}
@VisibleForTesting
- static Cache<Object, Object> forCache(
-
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.Cache<CompositeKey,
Object>
- cache) {
- return new SubCache<>(cache, CompositeKeyPrefix.ROOT);
+ static <K, V> Cache<K, V> forMaximumBytes(long maximumBytes) {
+ // We specifically use Guava cache since it allows for recursive
computeIfAbsent calls
+ // preventing deadlock from occurring when a loading function mutates the
underlying cache
+ LongAdder weightInBytes = new LongAdder();
+ return new SubCache<>(
+ new ShrinkOnEviction(
+ CacheBuilder.newBuilder()
+ .maximumWeight(maximumBytes >> WEIGHT_RATIO)
+ .weigher(
+ new Weigher<Object, WeightedValue<Object>>() {
+
+ @Override
+ public int weigh(Object key, WeightedValue<Object>
value) {
+ // Round up to the next closest multiple of
WEIGHT_RATIO
+ long size = ((value.getWeight() - 1) >>
WEIGHT_RATIO) + 1;
Review comment:
Originally I was having trouble getting a good way of not paying the
cost of weighing the key over and over but I solved that and added it back.
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