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https://issues.apache.org/jira/browse/CASSANDRA-8616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15429059#comment-15429059
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Yuki Morishita commented on CASSANDRA-8616:
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[~snazy] the problem comes from opening schema in the tools. They need to
access schema by opening {{system_schema}} keyspace that creates commit log. I
tried to patch commit log part, but various "online" features described above
came up after that. CASSANDRA-9587 can be useful here.
> sstable tools may result in commit log segments be written
> ----------------------------------------------------------
>
> Key: CASSANDRA-8616
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8616
> Project: Cassandra
> Issue Type: Bug
> Components: Tools
> Reporter: Tyler Hobbs
> Assignee: Yuki Morishita
> Fix For: 2.1.x, 2.2.x, 3.0.x, 3.x
>
> Attachments: 8161-2.0.txt
>
>
> There was a report of sstable2json causing commitlog segments to be written
> out when run. I haven't attempted to reproduce this yet, so that's all I
> know for now. Since sstable2json loads the conf and schema, I'm thinking
> that it may inadvertently be triggering the commitlog code.
> sstablescrub, sstableverify, and other sstable tools have the same issue.
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