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https://issues.apache.org/jira/browse/CASSANDRA-8683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14293446#comment-14293446
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Marcus Eriksson commented on CASSANDRA-8683:
--------------------------------------------
When I debugged this, the reason that we fell through all the way to that
"return null" was that the index only contained the last key, then we were at
EOF and ended the loop
> Incremental repairs broken with early opening of compaction results
> -------------------------------------------------------------------
>
> Key: CASSANDRA-8683
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8683
> Project: Cassandra
> Issue Type: Bug
> Reporter: Marcus Eriksson
> Assignee: Marcus Eriksson
> Fix For: 2.1.3
>
> Attachments: 0001-avoid-NPE-in-getPositionsForRanges.patch
>
>
> Incremental repairs holds a set of the sstables it started the repair on (we
> need to know which sstables were actually validated to be able to anticompact
> them). This includes any tmplink files that existed when the compaction
> started (if we wouldn't include those, we would miss data since we move the
> start point of the existing non-tmplink files)
> With CASSANDRA-6916 we swap out those instances with new ones
> (SSTR.cloneWithNewStart / SSTW.openEarly), meaning that the underlying file
> can get deleted even though we hold a reference.
> This causes the unit test error:
> http://cassci.datastax.com/job/trunk_utest/1330/testReport/junit/org.apache.cassandra.db.compaction/LeveledCompactionStrategyTest/testValidationMultipleSSTablePerLevel/
> (note that it only fails on trunk though, in 2.1 we don't hold references to
> the repairing files for non-incremental repairs, but the bug should exist in
> 2.1 as well)
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