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https://issues.apache.org/jira/browse/CASSANDRA-2620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13030725#comment-13030725
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Jonathan Ellis commented on CASSANDRA-2620:
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Couldn't we omit the TTL on disk, but recompute it in CassandraServer when
creating the Thrift struct to maintain compatibility there?
> Don't persist TTL for expiring columns
> --------------------------------------
>
> Key: CASSANDRA-2620
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2620
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Stu Hood
> Priority: Minor
> Fix For: 1.0
>
>
> We persist both the TTL (5 seconds from now) and the localExpirationTime (the
> local time at +5 seconds) for expiring columns, but the TTL is never used
> again, except when we return expiring columns to clients.
> Rather than storing the TTL to return to clients, we could calculate a delta
> TTL value by subtracting the current time from the localExpirationTime, and
> save 4 bytes on disk.
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