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https://issues.apache.org/jira/browse/CASSANDRA-20298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17939772#comment-17939772
 ] 

Dmitry Konstantinov commented on CASSANDRA-20298:
-------------------------------------------------

it looks like we need to backport the fix to 4.1 too: 
[https://ci-cassandra.apache.org/job/Cassandra-4.1/570/testReport/junit/org.apache.cassandra.db.commitlog/CommitLogCQLTest/testSwitchMemtable/]
{code:java}
Got error during memtable switching:
Java heap space
java.lang.OutOfMemoryError: Java heap space
Got error during memtable switching:
Java heap space
java.lang.OutOfMemoryError: Java heap space
        at java.nio.HeapByteBuffer.<init>(HeapByteBuffer.java:57)
        at java.nio.ByteBuffer.allocate(ByteBuffer.java:335)
        at 
org.apache.cassandra.utils.memory.SlabAllocator.getRegion(SlabAllocator.java:139)
        at 
org.apache.cassandra.utils.memory.SlabAllocator.allocate(SlabAllocator.java:104)
        at 
org.apache.cassandra.utils.memory.MemtableBufferAllocator$1.allocate(MemtableBufferAllocator.java:40)
        at 
org.apache.cassandra.utils.memory.ByteBufferCloner.clone(ByteBufferCloner.java:77)
        at 
org.apache.cassandra.utils.memory.ByteBufferCloner.clone(ByteBufferCloner.java:63)
        at 
org.apache.cassandra.utils.memory.ByteBufferCloner.clone(ByteBufferCloner.java:46)
        at 
org.apache.cassandra.db.memtable.SkipListMemtable.put(SkipListMemtable.java:120)
        at 
org.apache.cassandra.db.ColumnFamilyStore.apply(ColumnFamilyStore.java:1424)
        at 
org.apache.cassandra.db.CassandraTableWriteHandler.write(CassandraTableWriteHandler.java:40)
        at org.apache.cassandra.db.Keyspace.applyInternal(Keyspace.java:672)
        at org.apache.cassandra.db.Keyspace.apply(Keyspace.java:525)
        at org.apache.cassandra.db.Mutation.apply(Mutation.java:233)
        at org.apache.cassandra.db.Mutation.apply(Mutation.java:253)
        at 
org.apache.cassandra.cql3.statements.ModificationStatement.executeInternalWithoutCondition(ModificationStatement.java:675)
        at 
org.apache.cassandra.cql3.statements.ModificationStatement.executeLocally(ModificationStatement.java:666)
        at 
org.apache.cassandra.cql3.QueryProcessor.executeInternal(QueryProcessor.java:453)
        at 
org.apache.cassandra.db.commitlog.CommitLogCQLTest$1.run(CommitLogCQLTest.java:90)
Got error during memtable switching: {code}

> Test failure CommitLogCQLTest.testSwitchMemtable
> ------------------------------------------------
>
>                 Key: CASSANDRA-20298
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-20298
>             Project: Apache Cassandra
>          Issue Type: Bug
>          Components: Local/Commit Log
>            Reporter: Brandon Williams
>            Assignee: Dmitry Konstantinov
>            Priority: Normal
>             Fix For: 5.0.4, 5.1
>
>         Attachments: 
> TEST-org.apache.cassandra.db.commitlog.CommitLogCQLTest.log, 
> TEST-org.apache.cassandra.db.commitlog.CommitLogCQLTest.xml, steps.log, 
> test_log_with_heap_histo_and_thread_dump.txt
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> Seen here: 
> https://app.circleci.com/pipelines/github/driftx/cassandra/1831/workflows/0de1611d-d409-4d15-8171-dcf7183a8c61/jobs/112290/tests
> {noformat}
> unit.framework.AssertionFailedError: Forked Java VM exited abnormally. Please 
> note the time in the report does not reflect the time until the VM exit.
>       at jdk.internal.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
>       at 
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.base/java.util.Vector.forEach(Vector.java:1365)
>       at jdk.internal.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
>       at 
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at jdk.internal.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
>       at 
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.base/java.util.Vector.forEach(Vector.java:1365)
>       at jdk.internal.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
> {noformat}



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