THIS REPO HAS MOVED TO https://github.com/apache/incubator-iotdb. TsFile is a columnar file format designed for time-series data, which supports efficient compression and query. It is easy to integrate TsFile with your IOT big data processing frameworks.
compare cn.edu.tsinghua.tsfile.timeseries.utils.cache with https://github.com/apache/commons-collections/blob/master/src/main/java/org/apache/commons/collections4/map/LRUMap.java