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Date: Sat, 13 Aug 2011 20:00:53 -0700 (PDT)
From: lars hofhansl <lhofhansl@yahoo.com>
Reply-To: lars hofhansl <lhofhansl@yahoo.com>
Subject: Re: TTL for cell values
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Hey Ian, (how are things :)

I just stumbled across https://issues.apache.org/jira/browse/HBASE-4071.

-- Lars


________________________________
From: Ian Varley <ivarley@salesforce.com>
To: "user@hbase.apache.org" <user@hbase.apache.org>
Sent: Saturday, August 13, 2011 6:51 PM
Subject: TTL for cell values

Hi all,

Quick clarification on TTL for cells. The concept makes sense (instead of "keep 3 versions" you say "keep versions more recent than time T"). But, if there's only 1 value in the cell, and that value is older than the TTL, will it also be deleted?

If so, has there ever been discussion of a "TTL except for most recent" option? (i.e. you want the current version to be permanently persistent, but also want some time-based range of version history, so you can peek back and get consistent snapshots within the last hour, 6 hours, 24 hours, etc). TTL seems perfect for this, but not if it'll chomp the current version of cells too! :)

Thanks!
Ian
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