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https://issues.apache.org/jira/browse/CASSANDRA-17163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17445938#comment-17445938
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Benedict Elliott Smith commented on CASSANDRA-17163:
----------------------------------------------------
There's a very good chance that CASSANDRA-15511 will help here.
> High CAS failures in MemtablePool.SubPool.tryAllocate
> -----------------------------------------------------
>
> Key: CASSANDRA-17163
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17163
> Project: Cassandra
> Issue Type: Bug
> Components: Legacy/Local Write-Read Paths
> Reporter: Benjamin Lerer
> Assignee: Benjamin Lerer
> Priority: Normal
>
> In a cluster using {{memtable_allocation_type: offheap_buffers}} which handle
> a high amount of writes we are seeing some high contentions on
> {{MemtablePool.SubPool.tryAllocate}}.
> {code}"MutationStage-561" #5457 daemon prio=5 os_prio=0
> tid=0x00007f35dd3cfa50 nid=0x1407a runnable [0x00007f2357fd5000]
> java.lang.Thread.State: RUNNABLE
> at
> org.apache.cassandra.utils.memory.MemtablePool$SubPool.tryAllocate(MemtablePool.java:159)
> at
> org.apache.cassandra.utils.memory.MemtableAllocator$SubAllocator.allocate(MemtableAllocator.java:175)
> 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.db.rows.BufferCell.copy(BufferCell.java:140)
> at
> org.apache.cassandra.utils.memory.AbstractAllocator$CloningBTreeRowBuilder.addCell(AbstractAllocator.java:89)
> at org.apache.cassandra.db.rows.Rows.copy(Rows.java:49)
> at
> org.apache.cassandra.db.partitions.AtomicBTreePartition$RowUpdater.apply(AtomicBTreePartition.java:370)
> at
> org.apache.cassandra.db.partitions.AtomicBTreePartition$RowUpdater.apply(AtomicBTreePartition.java:333)
> at org.apache.cassandra.utils.btree.BTree.buildLeaf(BTree.java:195)
> at org.apache.cassandra.utils.btree.BTree.buildInternal(BTree.java:208)
> at org.apache.cassandra.utils.btree.BTree.buildInternal(BTree.java:227)
> at org.apache.cassandra.utils.btree.BTree.buildInternal(BTree.java:254)
> at org.apache.cassandra.utils.btree.BTree.build(BTree.java:177)
> at org.apache.cassandra.utils.btree.BTree.update(BTree.java:283)
> at
> org.apache.cassandra.db.partitions.AtomicBTreePartition.addAllWithSizeDeltaInternal(AtomicBTreePartition.java:143)
> at
> org.apache.cassandra.db.partitions.AtomicBTreePartition.addAllWithSizeDelta(AtomicBTreePartition.java:184)
> at org.apache.cassandra.db.Memtable.put(Memtable.java:295)
> at
> org.apache.cassandra.db.ColumnFamilyStore.apply(ColumnFamilyStore.java:1335)
> at
> org.apache.cassandra.db.CassandraTableWriteHandler.write(CassandraTableWriteHandler.java:40)
> at org.apache.cassandra.db.Keyspace.applyInternal(Keyspace.java:661)
> at org.apache.cassandra.db.Keyspace.apply(Keyspace.java:513)
> at org.apache.cassandra.db.Mutation.apply(Mutation.java:215)
> at org.apache.cassandra.db.Mutation.apply(Mutation.java:220)
> at org.apache.cassandra.db.Mutation.apply(Mutation.java:229)
> at
> org.apache.cassandra.service.StorageProxy$$Lambda$1019/640627333.run(Unknown
> Source)
> at
> org.apache.cassandra.service.StorageProxy$4.runMayThrow(StorageProxy.java:1544)
> at
> org.apache.cassandra.service.StorageProxy$LocalMutationRunnable$1.runMayThrow(StorageProxy.java:2314)
> at
> org.apache.cassandra.service.StorageProxy$HintRunnable.run(StorageProxy.java:2352)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at
> org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:162)
> at
> org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$LocalSessionFutureTask.run(AbstractLocalAwareExecutorService.java:134)
> at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:119)
> at
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
> at java.lang.Thread.run(Thread.java:748)
> Locked ownable synchronizers:
> - None
> {code}
> This issue is similar to CASSANDRA-15922.
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