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Aleksey Vorona commented on CASSANDRA-3974:
-------------------------------------------
Copying real life use cases which need this feature from the older bug (
CASSANDRA-3077 ):
1. I want one of my CFs not to store any data older than two months. It is a
"notifications" CF which is of no interest to user past certain point in time.
Currently I am setting TTL with each insert in the CF, but since it is a
constant it makes sense to me to have it configured in CF definition to apply
automatically to all rows in the CF.
2. Default TTL would be very helpfull in Map/Reduce scenarios where you dont
have direct control of TTL (IE: hive)
> Per-CF TTL
> ----------
>
> Key: CASSANDRA-3974
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3974
> Project: Cassandra
> Issue Type: New Feature
> Reporter: Jonathan Ellis
> Assignee: Kirk True
> Priority: Minor
> Fix For: 1.2
>
>
> Per-CF TTL would allow compaction optimizations ("drop an entire sstable's
> worth of expired data") that we can't do with per-column.
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