Todd Lipcon created KUDU-1677:
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Summary: Ordered scans may return out-of-order rows when
concurrent with compaction
Key: KUDU-1677
URL: https://issues.apache.org/jira/browse/KUDU-1677
Project: Kudu
Issue Type: Bug
Components: tablet
Affects Versions: 1.0.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
If an ordered scan starts during the 'phase 2' of a compaction (when there is a
DuplicatingRowSet in place), then the DuplicatingRowSet ends up creating a
UnionIterator of the original rowsets. This union is non-ordered, so it ends up
yielding out-of-order rows.
This is causing alter_table-randomized-test to have verification failures about
0.25% of the time, but should be relatively easy to reproduce by adding
concurrent ordered scans to some stress test that causes lots of compaction.
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