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https://issues.apache.org/jira/browse/CASSANDRA-14790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16636089#comment-16636089
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Jon Meredith commented on CASSANDRA-14790:
------------------------------------------
There are some minor races in the test, but the big problem seems to be the
calculation for how much buffer memory the worker threads should allocate.
Instead of dividing the poolSize across the workers, it instead allocates more
and more memory the more threads a machine has.
> LongBufferPoolTest burn test fails assertion
> --------------------------------------------
>
> Key: CASSANDRA-14790
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14790
> Project: Cassandra
> Issue Type: Test
> Components: Testing
> Environment: Run under macOS 10.13.6, with patch (attached, but also
> https://github.com/jonmeredith/cassandra/tree/failing-burn-test)
> Reporter: Jon Meredith
> Priority: Major
> Attachments: 0001-Add-burn-testsome-target-to-build.xml.patch,
> 0002-Initialize-before-running-LongBufferPoolTest.patch
>
>
> The LongBufferPoolTest from the burn tests fails with an assertion error. I
> added a build target to run individual burn tests, and \{jasobrown} gave a
> fix for the uninitialized test setup (attached), however the test now fails
> on an assertion about recycling buffers.
> To reproduce (with patch applied)
> {{ant burn-testsome
> -Dtest.name=org.apache.cassandra.utils.memory.LongBufferPoolTest
> -Dtest.methods=testAllocate}}
> Output
> {{ [junit] Testcase:
> testAllocate(org.apache.cassandra.utils.memory.LongBufferPoolTest): FAILED}}
> {{ [junit] null}}
> {{ [junit] junit.framework.AssertionFailedError}}
> {{ [junit] at
> org.apache.cassandra.utils.memory.BufferPool$Debug.check(BufferPool.java:204)}}
> {{ [junit] at
> org.apache.cassandra.utils.memory.BufferPool.assertAllRecycled(BufferPool.java:181)}}
> {{ [junit] at
> org.apache.cassandra.utils.memory.LongBufferPoolTest.testAllocate(LongBufferPoolTest.java:350)}}
> {{ [junit] at
> org.apache.cassandra.utils.memory.LongBufferPoolTest.testAllocate(LongBufferPoolTest.java:54)}}
> All major branches from 3.0 and later have issues, however the trunk branch
> also warns about references not being released before the reference is
> garbage collected.
> {{[junit] ERROR [Reference-Reaper:1] 2018-09-25 13:59:54,089 Ref.java:224 -
> LEAK DETECTED: a reference
> (org.apache.cassandra.utils.concurrent.Ref$State@7f58d19a) to @623704362 was
> not released before the reference was garbage collected}}
> {{ [junit] ERROR [Reference-Reaper:1] 2018-09-25 13:59:54,089 Ref.java:255 -
> Allocate trace org.apache.cassandra.utils.concurrent.Ref$State@7f58d19a:}}
> {{ [junit] Thread[pool-2-thread-24,5,main]}}
> {{ [junit] at java.lang.Thread.getStackTrace(Thread.java:1559)}}
> {{ [junit] at
> org.apache.cassandra.utils.concurrent.Ref$Debug.<init>(Ref.java:245)}}
> {{ [junit] at
> org.apache.cassandra.utils.concurrent.Ref$State.<init>(Ref.java:175)}}
> {{ [junit] at org.apache.cassandra.utils.concurrent.Ref.<init>(Ref.java:97)}}
> {{ [junit] at
> org.apache.cassandra.utils.memory.BufferPool$Chunk.setAttachment(BufferPool.java:663)}}
> {{ [junit] at
> org.apache.cassandra.utils.memory.BufferPool$Chunk.get(BufferPool.java:803)}}
> {{ [junit] at
> org.apache.cassandra.utils.memory.BufferPool$Chunk.get(BufferPool.java:793)}}
> {{ [junit] at
> org.apache.cassandra.utils.memory.BufferPool$LocalPool.get(BufferPool.java:388)}}
> {{ [junit] at
> org.apache.cassandra.utils.memory.BufferPool.maybeTakeFromPool(BufferPool.java:143)}}
> {{ [junit] at
> org.apache.cassandra.utils.memory.BufferPool.takeFromPool(BufferPool.java:115)}}
> {{ [junit] at
> org.apache.cassandra.utils.memory.BufferPool.get(BufferPool.java:85)}}
> {{ [junit] at
> org.apache.cassandra.utils.memory.LongBufferPoolTest$3.allocate(LongBufferPoolTest.java:296)}}
> {{ [junit] at
> org.apache.cassandra.utils.memory.LongBufferPoolTest$3.testOne(LongBufferPoolTest.java:246)}}
> {{ [junit] at
> org.apache.cassandra.utils.memory.LongBufferPoolTest$TestUntil.call(LongBufferPoolTest.java:399)}}
> {{ [junit] at
> org.apache.cassandra.utils.memory.LongBufferPoolTest$TestUntil.call(LongBufferPoolTest.java:379)}}
> {{ [junit] at java.util.concurrent.FutureTask.run(FutureTask.java:266)}}
> {{ [junit] at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)}}
> {{ [junit] at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)}}
> {{ [junit] at java.lang.Thread.run(Thread.java:748)}}
>
> Perhaps the environment is not being set up correctly for the tests.
>
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