public Pair<ByteBuffer, InsertNode> getByteBufferOrInsertNodeIfPossible(
      final WALEntryPosition position) {
    hasPipeRunning = true;
    return lruCache.getIfPresent(position);
  }
This cache is used by {@link WALEntryPosition}.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/wal/utils/WALInsertNodeCache.java