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https://issues.apache.org/jira/browse/CASSANDRA-13294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15897287#comment-15897287
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Marcus Eriksson commented on CASSANDRA-13294:
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+1 on the patch and [here|https://github.com/riptano/cassandra-dtest/pull/1449]
is an upgrade dtest which reproduces this
> Possible data loss on upgrade 2.1 - 3.0
> ---------------------------------------
>
> Key: CASSANDRA-13294
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13294
> Project: Cassandra
> Issue Type: Bug
> Reporter: Marcus Eriksson
> Assignee: Marcus Eriksson
> Priority: Blocker
> Fix For: 3.0.x, 3.11.x
>
>
> After finishing a compaction we delete the compacted away files. This is done
> [here|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/db/lifecycle/LogFile.java#L328-L337]
> which uses
> [this|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/db/lifecycle/LogRecord.java#L265-L271]
> to get the files - we get all files starting with {{absoluteFilePath}}.
> Absolute file path is generated
> [here|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/io/sstable/Descriptor.java#L142-L153].
> For 3.0 version files the filename looks like this:
> {{/blabla/keyspace1/standard1-bdb031c0ff7b11e6940fdd0479dd8912/mc-1332-big}}
> but for 2.1 version files, they look like this:
> {{/blabla/keyspace1/standard1-bdb031c0ff7b11e6940fdd0479dd8912/keyspace1-standard1-ka-2}}.
> The problem is then that if we were to finish a compaction including the
> legacy file, we would actually delete all legacy files having a generation
> starting with '2'
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