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https://issues.apache.org/jira/browse/CASSANDRA-13450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16691162#comment-16691162
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C. Scott Andreas commented on CASSANDRA-13450:
----------------------------------------------

Hello, sorry for the delay in reply on this issue. This bug tracker is 
primarily used by contributors of the Apache Cassandra project toward 
development of the database itself. If this is still an issue, can you reach 
out to the user's list or public IRC channel? A member of the community may be 
able to help.

Here's a page with information on the best channels for support: 
[http://cassandra.apache.org/community/]

If you're still experiencing this issue and believe it may be a bug in 
Cassandra, please feel free to reopen.

> repair thread stuck
> -------------------
>
>                 Key: CASSANDRA-13450
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13450
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: cassandra 3.7
>            Reporter: Roland Otta
>            Priority: Major
>
> we sometimes have stuck repair threads in our production system
> this is the corresponding stack trace
> {noformat}
> Name: Repair#202:3
> State: WAITING on 
> com.google.common.util.concurrent.AbstractFuture$Sync@56d7b0ab
> Total blocked: 0  Total waited: 1
> Stack trace: 
> sun.misc.Unsafe.park(Native Method)
> java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> com.google.common.util.concurrent.AbstractFuture$Sync.get(AbstractFuture.java:285)
> com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:116)
> com.google.common.util.concurrent.Uninterruptibles.getUninterruptibly(Uninterruptibles.java:137)
> com.google.common.util.concurrent.Futures.getUnchecked(Futures.java:1509)
> org.apache.cassandra.repair.RepairJob.run(RepairJob.java:160)
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> java.lang.Thread.run(Thread.java:745)
> {noformat}



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