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https://issues.apache.org/jira/browse/CASSANDRA-16844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17551204#comment-17551204
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David Capwell commented on CASSANDRA-16844:
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bq. I think that probably the only way to guarantee compatibility with 3rd
party tools parsing text output is not making changes at all.
A work around may be to hide this behind a flag, so you do `nodetool
compactionstats --show-sstables` and you get this output, else you get the
previous output?
bq. I guess some 3rd party tools out there could also find issues if they find
an unexpected column at the end depending on what they expect when parsing
Found this patch and saw a tool using awk positional parsing, so would break
> Add number of sstables in a compaction to compactionstats output
> ----------------------------------------------------------------
>
> Key: CASSANDRA-16844
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16844
> Project: Cassandra
> Issue Type: Improvement
> Components: Tool/nodetool
> Reporter: Brendan Cicchi
> Assignee: Brandon Williams
> Priority: Normal
> Fix For: 4.1, 4.1-alpha1
>
>
> It would be helpful to know at a glance how many sstables are involved in any
> running compactions. While this information can certainly be collected now, a
> user has to grab it from the debug logs. I think it would be helpful for some
> use cases to have this information straight from {{nodetool compactionstats}}
> and then if the actual sstables involved in the compactions are desired, dive
> into the debug.log for that. I think it would also be good to have this
> information in the output of {{nodetool compactionhistory}}.
>
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