redis异常解决：MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist

项目中用到redis做缓存服务器，近日出现这个异常：

redis.clients.jedis.exceptions.JedisDataException: MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk. Commands that may modify the data set are disabled. Please check Redis logs for details about the error.
redis.clients.jedis.Protocol.processError(Protocol.java:113)
redis.clients.jedis.Protocol.process(Protocol.java:138)
redis.clients.jedis.Protocol.read(Protocol.java:192)
redis.clients.jedis.Connection.readProtocolWithCheckingBroken(Connection.java:282)
redis.clients.jedis.Connection.getIntegerReply(Connection.java:207)
redis.clients.jedis.BinaryJedis.setnx(BinaryJedis.java:435)
com.radiadesign.catalina.session.RedisSessionManager.createSession(RedisSessionManager.java:274)
org.apache.catalina.connector.Request.doGetSession(Request.java:3014)
org.apache.catalina.connector.Request.getSession(Request.java:2378)
org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:897)
org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:909)
javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:238)
javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:238)
javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:238)
javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

解决方法：通过redis-cli连接到服务器后执行以下命令：

config set stop-writes-on-bgsave-error no