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_r306186002
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File path:
iotdb/src/main/java/org/apache/iotdb/db/engine/cache/TsFileMetaDataCache.java
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@@ -31,67 +32,113 @@
public class TsFileMetaDataCache {
private static final Logger logger =
LoggerFactory.getLogger(TsFileMetaDataCache.class);
+ private static final IoTDBConfig config =
IoTDBDescriptor.getInstance().getConfig();
+
+ private static final long MEMORY_THRESHOLD_IN_B = (long) (0.25 * config
+ .getAllocateMemoryForRead());
/**
- * key: The file seriesPath of tsfile.
+ * key: Tsfile path. value: TsFileMetaData
*/
- private ConcurrentHashMap<String, TsFileMetaData> cache;
+ private LruLinkedHashMap<String, TsFileMetaData> cache;
private AtomicLong cacheHintNum = new AtomicLong();
Review comment:
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