redis的rdb文件为什么会重新创建，造成数据丢失

最近redis连续两次dump.rdb文件小时，重新被创建了，里面的数据全部消失，不知道是什么原因，redis应用本身没有退出。

以下是配置文件

daemonize yes
pidfile /var/run/redis.pid
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 0
loglevel debug
logfile /var/log/redis.log

databases 16
#   save ""
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
# The filename where to dump the DB
dbfilename dump.rdb
dir /home/djy/redis/6397
slave-serve-stale-data yes
slave-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
appendonly no
# The name of the append only file (default: "appendonly.aof")
appendfilename "appendonly.aof"
# appendfsync always
appendfsync everysec
# appendfsync no
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-entries 512
list-max-ziplist-value 64
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
activerehashing yes
hz 10
aof-rewrite-incremental-fsync yes