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https://issues.apache.org/jira/browse/CASSANDRA-8616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15219012#comment-15219012
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Yuki Morishita commented on CASSANDRA-8616:
-------------------------------------------

Progress update: There are several places other than 
{{system.sstable_activity}} that offline tools access(vary by version). Trying 
to patch everything, otherwise tools can hang (dtest is catching these).

* In cassandra-2.2, offline tools (sstablesplit and posssibly other few) can 
update {{system.compaction_in_progress}} and {{system.compaction_history}}.
* In cassandra-3.0+, sstablescrub against secondary index sstables can update 
{{system.IndexInfo}}.

> 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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