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https://issues.apache.org/jira/browse/CASSANDRA-13873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16271931#comment-16271931
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Joel Knighton commented on CASSANDRA-13873:
-------------------------------------------
Sorry for the latency here - my fault. The patch looks good to me. I considered
a few other cases where a similar problem might exist. It seems to me the same
issue could exist in in the Splitter/Upgrader, but since they're offline, I
don't know what future changes would require another operation to reference
canonical sstables in parallel. I also don't see anything in anticompaction
grabbing a ref; am I missing something there?
The patches look good for existing cases. Unfortunately, I let the dtests age
out before taking a closer look, but I can rerun them after you look at the
question above. I'm +1 to merging the relatively trivial patches through to
trunk and opening a ticket to improve it later. As you've seen, I don't have a
huge amount of bandwidth for this right now, so I'd rather not delay a definite
improvement with only the promise of a better one. Thanks for the patience.
> Ref bug in Scrub
> ----------------
>
> Key: CASSANDRA-13873
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13873
> Project: Cassandra
> Issue Type: Bug
> Components: Tools
> Reporter: T Jake Luciani
> Assignee: Joel Knighton
> 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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