redis主备机数据同步失败的问题

Impala67m

已于 2022-04-02 10:08:09 修改

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分类专栏：学习随笔文章标签： redis

于 2020-11-12 18:07:11 首次发布

本文链接：https://blog.youkuaiyun.com/Impala67m/article/details/109649679

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在Redis 6.0.6版本中，遇到备机重启后数据同步失败的问题。问题源于client-output-buffer-limit配置过小，导致主机状态在bg_save和send_bulk间切换，从机出现I/O错误。解决方法是调整redis.conf，将client-output-buffer-limit slave设置为0，或者使用redis-cli临时修改配置，等待数据同步成功。

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redis版本为6.0.6，重启备机后数据同步失败。

查看主机info发现状态一直在bg_save和send_bulk中切换。

查看主机redis.log，出现Client ... scheduled to be closed ASAP for overcoming of output buffer limits.

查看从机redis.log，出现 I/O error trying to sync with MASTER: connection lost

此错误由缓冲区配置，即client-output-buffer-limit配得太小造成。可将client-output-buffer-limit slave(也作client-output-buffer-limit replica)的限制去除。

主从机均需修改以下配置：

1. 打开redis.conf，将replica/slave后三个参数置零

# vi redis.conf

# By default normal clients are not limited because they don't receive data
# without asking (in a push way), but just after a request, so only 
# asynchronous clients may create a scenario where data is requested faster
# than it can read.
#
# Instead there is a default limit for pubsub and replica clients, since
# subscribers and replicas receive data in a push fashion.
#
# Both the hard or the soft l