protected static void setupConfiguration() {
    CloneSnapshotFromClientTestBase.setupConfiguration();
    TEST_UTIL.getConfiguration().setLong(TimeToLiveHFileCleaner.TTL_CONF_KEY, 0);
    TEST_UTIL.getConfiguration().setInt(MobConstants.MOB_FILE_CACHE_SIZE_KEY, 0);
  }
This coprocessor is used to delay the flush.
hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestMobCloneSnapshotFromClientCloneLinksAfterDelete.java