@TestOnly
  boolean contains(WALEntryPosition position) {
    return lruCache.getIfPresent(position) != null;
  }
Batch load all wal entries in the file when any one key is absent.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/wal/utils/WALInsertNodeCache.java