Re: [Discussion] DDLs to operate on CarbonLRUCache

Posted by akashrn5 on Feb 19, 2019; 1:17pm
URL: http://apache-carbondata-dev-mailing-list-archive.168.s1.nabble.com/Discussion-DDLs-to-operate-on-CarbonLRUCache-tp75197p75242.html

Hi naman,

Thanks for proposing the feature. Looks really helpful from user and
developer perspective.

Basically needed the design document, so that all the doubts would be
cleared.

1. Basicaly how you are going to handle the sync issues like, multiple
queries with drop and show cache. are you going to introduce any locking
mechanism?

2. if user clears cache during query? how it is noing to behave? is it
allowed or concurrent operaion is blocked?

3. How it os gonna work with Distributed index server, and types of it like
embedded, presto and other and local server? basically what is the impact
with that?

4. You said you will launch a job to get the size from all the blocks
present. Currently we create the block or blocklet datamap, and calcute each
datamap size and then we add to cache based on the lru cach esize
configured. So wanted to know how you will be calculating the size in your
case

Regards,
Akash



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