LeiRui commented on a change in pull request #262: [IOTDB-144]meta data cache
for query
URL: https://github.com/apache/incubator-iotdb/pull/262#discussion_r305599152
##########
File path:
iotdb/src/main/java/org/apache/iotdb/db/engine/storagegroup/StorageGroupProcessor.java
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@@ -147,6 +149,11 @@
*/
private ModificationFile mergingModification;
+ /**
+ * This linked hash set records the access order of sensors used by query.
+ */
+ private LinkedHashSet<String> lruForSensorUsedInQuery = new
LinkedHashSet<>();
Review comment:
Does `LinkedHashSet` has LRU function? Maybe you want to use
`LruLinkedHashMap` but that is not set.
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