專案中用到redis做快取伺服器，近日出現這個異常：

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)

網上搜索，很多人都給出瞭解決方法，但沒有詳細說明問題的來龍去脈，暫且記下，待有空了研究。

解決方法：通過redis-cli連線到伺服器後執行以下命令：

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

如此即可。