Redis connection lost

events.js:141
ERROR 2016-04-09 10:21:37 throw er; // Unhandled 'error' event
ERROR 2016-04-09 10:21:37 ^
ERROR 2016-04-09 10:21:37
ERROR 2016-04-09 10:21:37 Error: Redis connection lost and command aborted in uncertain state. It might have been processed.
ERROR 2016-04-09 10:21:37 at RedisClient.connection_gone (/home/leanengine/app/node_modules/redis/index.js:587:17)
ERROR 2016-04-09 10:21:37 at Socket. (/home/leanengine/app/node_modules/redis/index.js:241:14)
ERROR 2016-04-09 10:21:37 at Socket.g (events.js:260:16)
ERROR 2016-04-09 10:21:37 at emitNone (events.js:72:20)
ERROR 2016-04-09 10:21:37 at Socket.emit (events.js:166:7)
ERROR 2016-04-09 10:21:37 at endReadableNT (streamreadable.js:905:12)
ERROR 2016-04-09 10:21:37 at nextTickCallbackWith2Args (node.js:442:9)
ERROR 2016-04-09 10:21:37 at process._tickDomainCallback (node.js:397:17)
ERROR 2016-04-09 10:21:37
ERROR 2016-04-09 10:21:37 npm ERR! Linux 3.13.0-63-generic
ERROR 2016-04-09 10:21:37 npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "start"
ERROR 2016-04-09 10:21:37 npm ERR! node v4.4.0
ERROR 2016-04-09 10:21:37 npm ERR! npm v2.14.20
ERROR 2016-04-09 10:21:37 npm ERR! code ELIFECYCLE
ERROR 2016-04-09 10:21:37 npm ERR! cch_fox_trunk@1.0.0 start: node --harmony server.js
ERROR 2016-04-09 10:21:37 npm ERR! Exit status 1
ERROR 2016-04-09 10:21:37 npm ERR!
ERROR 2016-04-09 10:21:37 npm ERR! Failed at the cch_fox_trunk@1.0.0 start script 'node --harmony server.js'.
ERROR 2016-04-09 10:21:37 npm ERR! This is most likely a problem with the cch_fox_trunk package,
ERROR 2016-04-09 10:21:37 npm ERR! not with npm itself.
ERROR 2016-04-09 10:21:37 npm ERR! Tell the author that this fails on your system:
ERROR 2016-04-09 10:21:37 npm ERR! node --harmony server.js
ERROR 2016-04-09 10:21:37 npm ERR! You can get information on how to open an issue for this project with:
ERROR 2016-04-09 10:21:37 npm ERR! npm bugs cch_fox_trunk
ERROR 2016-04-09 10:21:37 npm ERR! Or if that isn't available, you can get their info via:
ERROR 2016-04-09 10:21:37 npm ERR!
ERROR 2016-04-09 10:21:37 npm ERR! npm owner ls cch_fox_trunk
ERROR 2016-04-09 10:21:37 npm ERR! There is likely additional logging output above.
ERROR 2016-04-09 10:21:37
ERROR 2016-04-09 10:21:37 npm ERR! Please include the following file with any support request:
ERROR 2016-04-09 10:21:37 npm ERR! /home/leanengine/app/npm-debug.log

这是啥原因 突然连不上redis了 这是空间满了还是怎么回事..
我看leancache显示状态是
当前使用情况
NaN undefined