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https://issues.apache.org/jira/browse/CASSANDRA-21507?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitry Konstantinov reassigned CASSANDRA-21507:
-----------------------------------------------
Assignee: Dmitry Konstantinov
> Flaky dtest - largecolumn_test.TestLargeColumn::test_cleanup fails due to
> memory exhaustion
> -------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-21507
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21507
> Project: Apache Cassandra
> Issue Type: Bug
> Components: Test/dtest/python
> Reporter: C. Scott Andreas
> Assignee: Dmitry Konstantinov
> Priority: Normal
>
> {{largecolumn_test.TestLargeColumn::test_cleanup}} verifies that off-heap
> (direct) memory does not grow proportionally across repeated large-column
> requests. It attempts reads of multiple 64MB columns to assert this, and
> occasionally exhausts available memory. But the exact column size is
> incidental to that goal — the test just intends to assert that off-heap
> memory allocated doesn't increase.
> The ccm node heap is a fixed 500MB. At the original {{LARGE_COLUMN_SIZE =
> 63MiB}} (and even at 48MiB), a node exhausts its 500MB heap and OOMs before
> the direct-memory assertion can run. The node is killed
> ({{{}-XX:OnOutOfMemoryError=kill -9{}}}, ~294MB heap dump written), and the
> subsequent {{CL=ALL}} read fails with {{{}ReadTimeoutException{}}}("2
> required, 1 responded") / cassandra-stress {{{}ToolError{}}}.
>
> *Proposed Change:*
> Since the column size is ~incidental to the test's intention, we can probably
> lower it from 64MB to 32MB.
> At 32MB, the test passes 100/100 runs.
>
> *Potential patch (model-assisted):*
> [https://github.com/cscotta/cassandra-dtest/pull/2/changes]
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