qiaojialin commented on a change in pull request #258: [IOTDB-143]Development 
of merge
URL: https://github.com/apache/incubator-iotdb/pull/258#discussion_r313297965
 
 

 ##########
 File path: 
tsfile/src/main/java/org/apache/iotdb/tsfile/read/controller/MetadataQuerier.java
 ##########
 @@ -62,4 +62,9 @@
    */
   List<TimeRange> convertSpace2TimePartition(List<Path> paths, long 
spacePartitionStartPos,
       long spacePartitionEndPos) throws IOException;
+
+  /**
+   * clear caches (if used) to release memory.
+   */
+  void clear();
 
 Review comment:
   rename this class to IMetadataQuerier?

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