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https://issues.apache.org/jira/browse/CASSANDRA-13873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16212774#comment-16212774
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Joel Knighton commented on CASSANDRA-13873:
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+1 - I'd like to introduce as few changes as possible to older versions here.
That combination sounds good to me. Do you want to prepare the patch for older
versions or would you like me to?
> Ref bug in Scrub
> ----------------
>
> Key: CASSANDRA-13873
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13873
> Project: Cassandra
> Issue Type: Bug
> Reporter: T Jake Luciani
> Assignee: Joel Knighton
> Priority: Critical
> Fix For: 2.2.x, 3.0.x, 3.11.x, 4.x
>
>
> I'm hitting a Ref bug when many scrubs run against a node. This doesn't
> happen on 3.0.X. I'm not sure if/if not this happens with compactions too
> but I suspect it does.
> I'm not seeing any Ref leaks or double frees.
> To Reproduce:
> {quote}
> ./tools/bin/cassandra-stress write n=10m -rate threads=100
> ./bin/nodetool scrub
> #Ctrl-C
> ./bin/nodetool scrub
> #Ctrl-C
> ./bin/nodetool scrub
> #Ctrl-C
> ./bin/nodetool scrub
> {quote}
> Eventually in the logs you get:
> WARN [RMI TCP Connection(4)-127.0.0.1] 2017-09-14 15:51:26,722
> NoSpamLogger.java:97 - Spinning trying to capture readers
> [BigTableReader(path='/home/jake/workspace/cassandra2/data/data/keyspace1/standard1-2eb5c780998311e79e09311efffdcd17/mc-5-big-Data.db'),
>
> BigTableReader(path='/home/jake/workspace/cassandra2/data/data/keyspace1/standard1-2eb5c780998311e79e09311efffdcd17/mc-32-big-Data.db'),
>
> BigTableReader(path='/home/jake/workspace/cassandra2/data/data/keyspace1/standard1-2eb5c780998311e79e09311efffdcd17/mc-31-big-Data.db'),
>
> BigTableReader(path='/home/jake/workspace/cassandra2/data/data/keyspace1/standard1-2eb5c780998311e79e09311efffdcd17/mc-29-big-Data.db'),
>
> BigTableReader(path='/home/jake/workspace/cassandra2/data/data/keyspace1/standard1-2eb5c780998311e79e09311efffdcd17/mc-27-big-Data.db'),
>
> BigTableReader(path='/home/jake/workspace/cassandra2/data/data/keyspace1/standard1-2eb5c780998311e79e09311efffdcd17/mc-26-big-Data.db'),
>
> BigTableReader(path='/home/jake/workspace/cassandra2/data/data/keyspace1/standard1-2eb5c780998311e79e09311efffdcd17/mc-20-big-Data.db')],
> *released:
> [BigTableReader(path='/home/jake/workspace/cassandra2/data/data/keyspace1/standard1-2eb5c780998311e79e09311efffdcd17/mc-5-big-Data.db')],*
>
> This released table has a selfRef of 0 but is in the Tracker
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