[jira] [Updated] (CASSANDRA-12882) Deadlock in MemtableAllocator

["Michael Shuler (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-12882?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Shuler updated CASSANDRA-12882:
---------------------------------------
    Fix Version/s:     (was: 3.5)
                   3.11.x

> Deadlock in MemtableAllocator
> -----------------------------
>
>                 Key: CASSANDRA-12882
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12882
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Ubuntu 14.40
> Cassandra 3.5
>            Reporter: Nimi Wariboko Jr.
>            Priority: Major
>             Fix For: 3.11.x
>
>         Attachments: cassandra.yaml, threaddump.txt
>
>
> I'm seeing an issue where a node will eventually lock up and their thread pools - I looked into jstack, and a lot of threads are stuck in the Memtable Allocator
> {code}
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:304)
> 	at org.apache.cassandra.utils.concurrent.WaitQueue$AbstractSignal.awaitUninterruptibly(WaitQueue.java:279)
> 	at org.apache.cassandra.utils.memory.MemtableAllocator$SubAllocator.allocate(MemtableAllocator.java:198)
> 	at org.apache.cassandra.utils.memory.SlabAllocator.allocate(SlabAllocator.java:89)
> 	at org.apache.cassandra.utils.memory.ContextAllocator.allocate(ContextAllocator.java:57)
> 	at org.apache.cassandra.utils.memory.ContextAllocator.clone(ContextAllocator.java:47)
> 	at org.apache.cassandra.utils.memory.MemtableBufferAllocator.clone(MemtableBufferAllocator.java:41)
> {code}
> I looked into the code, and its not immediately apparent to me what thread might hold the relevant lock.



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