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From "Marcus Eriksson (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-13873) Ref bug in Scrub
Date Thu, 19 Oct 2017 13:29:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16210874#comment-16210874
] 

Marcus Eriksson edited comment on CASSANDRA-13873 at 10/19/17 1:28 PM:
-----------------------------------------------------------------------

bq. the scrubs will eventually proceed once the lifecycle transaction finishes,
but shouldn't cancelling the scrub-compaction also finish the txn?

I'll take review unless you had someone else lined up - -is this still "critical" after your
analysis [~jkni]-? Edit: yup, looks like it


was (Author: krummas):
bq. the scrubs will eventually proceed once the lifecycle transaction finishes,
but shouldn't cancelling the scrub-compaction also finish the txn?

I'll take review unless you had someone else lined up - is this still "critical" after your
analysis [~jkni]? 

> 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
>
> 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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