public boolean executeMemoryRelease(AtomicLong releaseNodeNum, AtomicLong releaseMemorySize) {
    if (regionStatistics.getUnpinnedMemorySize() != 0) {
      return !memoryManager.evict(releaseNodeNum, releaseMemorySize);
    } else {
      return true;
    }
  }
Fetching evictable nodes from memoryManager. Update the memory status after evicting each node.

@return should not continue releasing
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/mtree/impl/pbtree/CachedMTreeStore.java