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https://issues.apache.org/jira/browse/CASSANDRA-21182?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitry Konstantinov updated CASSANDRA-21182:
--------------------------------------------
Status: Ready to Commit (was: Review In Progress)
> Fix flaky DTest: largecolumn_test.TestLargeColumn
> -------------------------------------------------
>
> Key: CASSANDRA-21182
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21182
> Project: Apache Cassandra
> Issue Type: Bug
> Components: Test/dtest/java
> Reporter: Sam Lightfoot
> Assignee: Sam Lightfoot
> Priority: Normal
> Fix For: 5.1
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Flakiness indicating more than 64MB of direct pool growth between stress tests
> {code:java}
> # Now run the full stack to warm up internal caches/pools
> LARGE_COLUMN_SIZE = 1024 * 1024 * 63
> self.stress_with_col_size(cluster, node1, LARGE_COLUMN_SIZE)
> after1stLargeStress = self.directbytes(node1)
> logger.info("After 1st large column stress, direct memory:
> {0}".format(after1stLargeStress))
> # Now run the full stack to see how much memory is allocated for the second
> "large" columns request
> self.stress_with_col_size(cluster, node1, LARGE_COLUMN_SIZE)
> after2ndLargeStress = self.directbytes(node1)
> logger.info("After 2nd large column stress, direct memory:
> {0}".format(after2ndLargeStress))
> # We may allocate direct memory proportional to size of a request
> # but we want to ensure that when we do subsequent calls the used direct
> memory is not growing
> diff = int(after2ndLargeStress) - int(after1stLargeStress)
> logger.info("Direct memory delta: {0}".format(diff))
> assert diff < LARGE_COLUMN_SIZE {code}
> [https://pre-ci.cassandra.apache.org/job/cassandra/410/testReport/junit/dtest.largecolumn_test/TestLargeColumn/Tests___dtest_jdk21_34_64___test_cleanup/history/]
> {code:java}
> assert 66073403 < 66060288 {code}
> This could be a real issue - this amount of growth is unexpected.
> Appears it may be isolated to JDK21:
> *
> [https://pre-ci.cassandra.apache.org/job/cassandra/412/testReport/junit/dtest.largecolumn_test/TestLargeColumn/Tests___dtest_jdk21_34_64___test_cleanup/]
> *
> [https://pre-ci.cassandra.apache.org/job/cassandra/410/testReport/junit/dtest.largecolumn_test/TestLargeColumn/Tests___dtest_jdk21_34_64___test_cleanup/]
>
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