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Posted to commits@cassandra.apache.org by "Stefan Miklosovic (Jira)" <ji...@apache.org> on 2024/09/10 07:49:00 UTC
[jira] [Updated] (CASSANDRA-17298) Improve accuracy of memtable heap usage tracking
[ https://issues.apache.org/jira/browse/CASSANDRA-17298?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Stefan Miklosovic updated CASSANDRA-17298:
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Summary: Improve accuracy of memtable heap usage tracking (was: Test Failure: org.apache.cassandra.cql3.MemtableSizeTest)
> Improve accuracy of memtable heap usage tracking
> ------------------------------------------------
>
> Key: CASSANDRA-17298
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17298
> Project: Cassandra
> Issue Type: Bug
> Components: Test/unit
> Reporter: Josh McKenzie
> Assignee: Dmitry Konstantinov
> Priority: Normal
> Fix For: 4.0.x, 4.1.x
>
> Attachments: analyzed_objects.svg, structure_example.svg
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> [https://ci-cassandra.apache.org/job/Cassandra-4.0/313/testReport/org.apache.cassandra.cql3/MemtableSizeTest/testTruncationReleasesLogSpace_2/]
> Failed 4 times in the last 30 runs. Flakiness: 27%, Stability: 86%
> Error Message
> Expected heap usage close to 49.930MiB, got 41.542MiB.
> {code}
> Stacktrace
> junit.framework.AssertionFailedError: Expected heap usage close to 49.930MiB, got 41.542MiB.
> at org.apache.cassandra.cql3.MemtableSizeTest.testSize(MemtableSizeTest.java:130)
> at org.apache.cassandra.Util.runCatchingAssertionError(Util.java:644)
> at org.apache.cassandra.Util.flakyTest(Util.java:669)
> at org.apache.cassandra.cql3.MemtableSizeTest.testTruncationReleasesLogSpace(MemtableSizeTest.java:61)
> at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> {code}
> *UPDATE:* It was discovered that unit tests were running with memtable_allocation_type: offheap_objects when we ship C* with heap_buffers.
> So we changed that in CASSANDRA-19326, now we test with memtable_allocation_type: heap_buffers. As a result, this test now fails all the time on 4.0 and 4.1.
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