CODEWITHSUNDEEP
node.jsredis
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Prem

Reputation: 5987

How to get index of the lpop'ed or rpop'ed item of Redis

I am working on real-time analytics using Redis as in-memory database. In my analytics, I keep on doing rpop on growing Redis-list to perform analytics on every rpop'ed items. To perform clean-up of Redis-list and not to allow growing up enormously, I should extract and make a back-up of Redis-list at 23:59:59 of every day.

If I blindly do a clean-up on Redis-list exactly at 23:59:59, there are possiblity that few elements which are not lpop'ed or rpop'ed may get cleaned-up. Index is the best option to clean-up the growing list while it's being analyzed.

Is there any Redis-commands to get the index of lpop'ed or rpop'ed item?

Upvotes: 0

Views: 121

Answers (1)

bubulemaster
bubulemaster

Reputation: 251

if I understand, when you pop list, you want value and index of value. In case of lpop, index is alway 0. In case of rpop, only way is use llen.

To run llen and rpop in one time, you need use transaction like :

MULTI
LLEN my-queue
RPOP myqueue
EXEC

Regards,

Upvotes: 1

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