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https://issues.apache.org/jira/browse/CASSANDRA-12882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16442109#comment-16442109
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Norbert Schultz commented on CASSANDRA-12882:
---------------------------------------------
[~krummas] I can provide you with the thread dump part from a heap dump.
[~jjirsa] I have no physical access to the machines, but according to our admin
stuff the machines do not respond at all anymore and they get restarted as soon
as they are stuck. In their view there is no abnormal high number of sstables.
> 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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