[GitHub] [incubator-iotdb] samperson1997 commented on a change in pull request #1134: [IOTDB-631] Using new TsFile MetadataIndex to optimize query and cache

[GitBox <gi...@apache.org>]

samperson1997 commented on a change in pull request #1134:
URL: https://github.com/apache/incubator-iotdb/pull/1134#discussion_r418949710



##########
File path: server/src/main/java/org/apache/iotdb/db/engine/cache/TimeSeriesMetadataCache.java
##########
@@ -125,9 +130,20 @@ public TimeseriesMetadata get(TimeSeriesMetadataCacheKey key, Set<String> allSen
         return null;
       }
       TsFileSequenceReader reader = FileReaderManager.getInstance().get(key.filePath, true);
-      TimeseriesMetadata timeseriesMetadata = reader.readTimeseriesMetadata(new Path(key.device, key.measurement));
-      lruCache.put(key, timeseriesMetadata);
-      return timeseriesMetadata;
+      TimeseriesMetadata resultTimeseriesMetadata = reader
+          .readTimeseriesMetadata(new Path(key.device, key.measurement));
+      lruCache.put(key, resultTimeseriesMetadata);
+
+      List<TimeseriesMetadata> timeSeriesMetadataList = reader
+          .readTimeseriesMetadata(key.device, allSensors);
+      if (!allSensors.isEmpty()) {
+        // put TimeSeriesMetadata of all sensors used in this query into cache
+        timeSeriesMetadataList.forEach(timeseriesMetadata -> {
+          lruCache.put(new TimeSeriesMetadataCacheKey(key.filePath, key.device,
+              timeseriesMetadata.getMeasurementId()), timeseriesMetadata);
+        });
+      }

Review comment:
       Great! Fixed.




----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

For queries about this service, please contact Infrastructure at:
users@infra.apache.org