readLock

server/src/main/java/org/elasticsearch/common/cache/Cache.java

@@ -653,15 +653,15 @@ public void remove() {
 
  /**
  * Performs an action for each cache entry in the cache. While iterating over the cache entries this method is protected from mutations
- * that occurs within the same cache segment by acquiring the segment's writing lock during all the iteration. As such, the specified
+ * that occurs within the same cache segment by acquiring the segment's read lock during all the iteration. As such, the specified
  * consumer should not try to modify the cache. Modifications that occur in already traveled segments won't been seen by the consumer
  * but modification that occur in non yet traveled segments should be.
  *
  * @param consumer the {@link Consumer}
  */
  public void forEach(BiConsumer<K, V> consumer) {
  for (CacheSegment<K, V> segment : segments) {
- try (ReleasableLock ignored = segment.writeLock.acquire()) {
+ try (ReleasableLock ignored = segment.readLock.acquire()) {
  for (CompletableFuture<Entry<K, V>> future : segment.map.values()) {
  try {
  if (future != null && future.isDone()) {