TimeWindowCompactionStrategy and don’t delete the data you should be relying on 
Cassandra to drop the SSTables once the data inside has expired.

THat 18% is probably waiting on gc_grace, this shouldn’t be an issue if you are 
letting TWCS drop the data rather then running deletes.

Regards,
Evelyn.

> On 19 Jun 2018, at 8:28 pm, Abhishek Singh <abh23...@gmail.com> wrote:
> 
> Hi all,
>            We using Cassandra for storing events which are time series based 
> for batch processing once a particular batch based on hour is processed we 
> delete the entries but we were left with almost 18% deletes marked as 
> Tombstones.
>                  I ran compaction on the particular CF tombstone didn't come 
> down.
>             Can anyone suggest what is the optimal tunning/recommended 
> practice used for compaction strategy and GC_grace period with 100k entries 
> and deletes every hour.
> 
> Warm Regards
> Abhishek Singh


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