@TestOnly
  public static void disableFileInfoCacheForTest() {
    globalFileInfoCacheEnabled = false;
    globalRoughInfoCacheForCompaction = Collections.emptyMap();
    globalFileInfoCacheForFailedCompaction = Collections.emptyMap();
  }
The size of global compaction estimation rough file info cahce.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/compaction/selector/estimator/AbstractCompactionEstimator.java