public void recordReleaseMetrics(long costTime, long releaseNodeNum, long releaseMemorySize) {
    metric.recordRelease(costTime, releaseNodeNum, releaseMemorySize);
  }
clear all the data of MTreeStore in memory and disk.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/mtree/impl/pbtree/CachedMTreeStore.java