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https://issues.apache.org/jira/browse/CASSANDRA-18131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17707732#comment-17707732
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Maxim Muzafarov commented on CASSANDRA-18131:
---------------------------------------------

[~mck]

I have reused the value from the 
[{{cassandra-3.11}}|https://github.com/apache/cassandra/blob/cassandra-3.11/test/burn/org/apache/cassandra/utils/LongBTreeTest.java#L61]
 branch, where the test completed successfully in ~20-40 min, depending on the 
CI agent used.
Here is an example of the lastest run for 3.11:
https://ci-cassandra.apache.org/view/Cassandra%203.11/job/Cassandra-3.11-test-burn/496/

I tested the patch with perThreadTrees = 100 (the same as for 3.11) and it 
finished within 38 min which looks pretty much the same.
https://ci-cassandra.apache.org/job/Cassandra-devbranch-test-burn/1810/

I think we can reduce the value to perThreadTrees = 10, my local runs show 
exactly 5 min execution time.

> LongBTreeTest times out after btree improvements from CASSANDRA-15510
> ---------------------------------------------------------------------
>
>                 Key: CASSANDRA-18131
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-18131
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local/Memtable
>            Reporter: Michael Semb Wever
>            Assignee: Maxim Muzafarov
>            Priority: Normal
>             Fix For: 4.0.x, 4.1.x, 5.x
>
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> Happening in both ci-cassandra.a.o and circleci.
> LongBTreeTest is timing out on 4.0, 4.1, trunk branches.
> Started back in mid April 
> (https://github.com/apache/cassandra/commit/018c8e0d5e and 
> https://github.com/apache/cassandra/commit/596daeb7f08). 
> Nightlies shows when the failures started, evident by the 
> 'jdk=jdk_1.8_latest,label=cassandra,split=7/' subfolder missing in the 
> following… 
> - 
> https://nightlies.apache.org/cassandra/trunk/Cassandra-trunk-test-burn/1254/Cassandra-trunk-test-burn/
> - 
> https://nightlies.apache.org/cassandra/cassandra-4.0/Cassandra-4.0-test-burn/343/



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