code: public void deleteById(String id) {
          final String sid = sessionPrefix + ":" + id;
          try {
              this.executor.execute(new RedisCallback<Void>() {
                  public Void execute(Jedis jedis) {
                      jedis.del(sid);
                      return null;
                  }
              });
          } catch (Exception e) {
              log.error("failed to delete session(key={}) in redis,cause:{}", sid, Throwables.getStackTraceAsString(e));
          }
      }
docs: delete session physically
  @param id session id