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https://issues.apache.org/jira/browse/CASSANDRA-7668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14179493#comment-14179493
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sankalp kohli commented on CASSANDRA-7668:
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If people are migrating to 1.2.19 and has done some schema changes in the last
7 days, it will cause problems during migration.
This is because tombstones written within last 7 days will be picked up by
1.2.19 nodes and 1.2.17 nodes will not add them to schema version.
This will cause schema version to differ till all nodes have been upgraded.
> Make gc_grace_seconds 7 days for system tables
> ----------------------------------------------
>
> Key: CASSANDRA-7668
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7668
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Tyler Hobbs
> Assignee: Tyler Hobbs
> Priority: Minor
> Fix For: 1.2.19, 2.0.10, 2.1 rc5
>
> Attachments: 7668-1.2.txt, 7668-2.0.txt
>
>
> The system tables have had a {{gc_grace_seconds}} of 8640 since
> CASSANDRA-4018. This was probably a typo and was intended to be 10 days. In
> CASSANDRA-6717 we will set gc_grace to seven days, so that would be a
> reasonable value to use here.
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