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KAFKA-8736: Streams performance improvement, use isEmpty() rather tha… #7164

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merged 1 commit into from Aug 6, 2019
Merged

KAFKA-8736: Streams performance improvement, use isEmpty() rather tha… #7164

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4 changes: 4 additions & 0 deletions streams/src/main/java/org/apache/kafka/streams/state/internals/NamedCache.java
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Expand Up @@ -266,6 +266,10 @@ public long size() {
return cache.size();
}

public boolean isEmpty() {
return cache.isEmpty();
}

synchronized Iterator<Map.Entry<Bytes, LRUNode>> subMapIterator(final Bytes from, final Bytes to) {
return cache.subMap(from, true, to, true).entrySet().iterator();
}
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4 changes: 2 additions & 2 deletions streams/src/main/java/org/apache/kafka/streams/state/internals/ThreadCache.java
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Expand Up @@ -193,7 +193,7 @@ public MemoryLRUCacheBytesIterator all(final String namespace) {
}
return new MemoryLRUCacheBytesIterator(cache.allIterator());
}

public long size() {
long size = 0;
for (final NamedCache cache : caches.values()) {
Expand Down Expand Up @@ -235,7 +235,7 @@ private void maybeEvict(final String namespace) {
// a put on another cache. So even though the sizeInBytes() is
// still > maxCacheSizeBytes there is nothing to evict from this
// namespaced cache.
if (cache.size() == 0) {
if (cache.isEmpty()) {
return;
}
cache.evict();
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