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https://issues.apache.org/jira/browse/CASSANDRA-12212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15402014#comment-15402014
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Aleksey Yeschenko commented on CASSANDRA-12212:
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Mostly correct. "only for a very short period of time" is not true. Pre-2.1
counter cells can remain in the system potentially forever, as there is no
guarantee old counter values would ever be overridden.
> system.compactions_in_progress needs to be used on first upgrade to 3.0
> -----------------------------------------------------------------------
>
> Key: CASSANDRA-12212
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12212
> Project: Cassandra
> Issue Type: Bug
> Components: Compaction
> Reporter: Jeremiah Jordan
> Assignee: Stefania
> Fix For: 3.0.x, 3.x
>
>
> CASSANDRA-7066 removed the system.compactions_in_progress table and replaced
> it with the new transaction system. But system.compactions_in_progress needs
> to be consulted for the first startup after upgrading from 2.1 to 3.0.
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