protected static void initCommon() throws Exception {
    UTIL.startMiniDFSCluster(1);
    fs = UTIL.getDFSCluster().getFileSystem();
    rootDir = UTIL.getDefaultRootDirPath();
    snapshotDir = SnapshotDescriptionUtils.getSnapshotsDir(rootDir);
    conf = UTIL.getConfiguration();
  }
Test that we correctly reload the cache, filter directories, etc.
hbase-server/src/test/java/org/apache/hadoop/hbase/master/snapshot/TestSnapshotFileCache.java