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https://issues.apache.org/jira/browse/CASSANDRA-16070?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17187573#comment-17187573
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Michael Semb Wever commented on CASSANDRA-16070:
------------------------------------------------

bq. I've seen a few from memory but I can only find this one now. 

I believe that was the full disk we saw over friday+weekend on the master. The 
releases cut causes a flurry of builds. Normal agents seem to be handling this 
~somewhat ok/better-than-before. But master is now the issue. I am trying to 
[follow it up|https://the-asf.slack.com/archives/CS6CA748J/p1598677213006200] 
with Gavin (infra), but without an accurate picture of where the space is being 
used, it's only guesswork on what to not produce and/or clean up better.

> Add dtest option to keep ccm test directories for just failed tests
> -------------------------------------------------------------------
>
>                 Key: CASSANDRA-16070
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16070
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Test/dtest/python
>            Reporter: Michael Semb Wever
>            Assignee: Michael Semb Wever
>            Priority: Normal
>             Fix For: 4.0-beta2
>
>
> DTests already have an option {{`--keep-test-dir`}} that keeps the ccm test 
> directories. This is useful for debugging failures, especially those that 
> can't be reproduced locally.
> [Introducing|https://github.com/apache/cassandra-builds/commit/51eb85b57b62a542ca456e52a20bee06955f6ec1#diff-a885314255cf7d5c7c04889bf01aa2ab]
>  this option to ci-cassandra.a.o 
> [failed|https://github.com/apache/cassandra-builds/commit/d1600acde19cdbd906b0ff89318d3e8a3f400a70#diff-a885314255cf7d5c7c04889bf01aa2ab]
>  due to lack of disk space.
> This 
> [patch|https://github.com/apache/cassandra-dtest/compare/master...thelastpickle:mck/keep_failed_test_dir]
>  introduces a new option {{`--keep-failed-test-dir`}} that keeps the ccm test 
> directory only for dtests that fail.
> This should suffice, if disk space is still a problem, a further option of 
> {{`--keep-failed-test-log-dir`}} can be added that only keeps the logs inside 
> the ccm test directory, as the majority of space taken up by these 
> directories are the cassandra data directories.



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