flush_all 后 keys * 仍然显示key

[qishibo]

如图，flush_all之后继续执行keys *,key仍然显示，但get操作其实是读不到了

[fandypeng]

你好， flush_all操作的意思是清空所有键值，但是不删除items。 详细请参考官方文档，https://github.com/memcached/memcached/wiki/Commands#flushall。

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在 2018年4月11日，下午4:01，qii404 ***@***.***> 写道： <https://user-images.githubusercontent.com/5136418/38603885-70fd143c-3da1-11e8-8949-9904699f03a7.png> 如图，flush_all之后继续执行keys *,key仍然显示，但get操作其实是读不到了 — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#1>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AFQrIMYMeAyijPJirXjYh_79Bs-MZ1Dlks5tnbhKgaJpZM4TPi-X>.

[qishibo]

看了官方说明

flush_all
Invalidate all existing cache items. Optionally takes a parameter, which means to invalidate all items after N seconds have passed.This command does not pause the server, as it returns immediately. It does not free up or flush memory at all, it just causes all items to expire.

应该是让所有item失效，从hashtable中删除对应key，但不是立即释放空间。

所以keys * 按理说应该读不到才对，得看你的咋实现的 😄