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https://issues.apache.org/jira/browse/CASSANDRA-18125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17676336#comment-17676336
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Benedict Elliott Smith commented on CASSANDRA-18125:
----------------------------------------------------
Are you able to (privately) share detailed logs and schema information, so we
can perhaps ascertain some information about the workload that might have
triggered this problem?
The exception you mention is very unlikely to be related, though it does
suggest this is all happening on startup?
> AssertionError on thread MemtableReclaimMemory in
> MemtablePool$SubPool.released(MemtablePool.java:193)
> ------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-18125
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18125
> Project: Cassandra
> Issue Type: Bug
> Reporter: Nicolas Henneaux
> Priority: Normal
>
> On two nodes (on a 5 nodes cluster) on the cluster I'm running, I got the
> following exception. It occurred at 3,5 minutes interval.
> {code}
> MemtableReclaimMemory:2625 org.apache.cassandra.service.CassandraDaemon
> uncaughtException - Exception in thread
> Thread[MemtableReclaimMemory:2625,5,main]java.lang.AssertionError: null
> at
> org.apache.cassandra.utils.memory.MemtablePool$SubPool.released(MemtablePool.java:193)
> at
> org.apache.cassandra.utils.memory.MemtableAllocator$SubAllocator.releaseAll(MemtableAllocator.java:151)
> at
> org.apache.cassandra.utils.memory.MemtableAllocator$SubAllocator.setDiscarded(MemtableAllocator.java:142)
> at
> org.apache.cassandra.utils.memory.MemtableAllocator.setDiscarded(MemtableAllocator.java:93)
> at
> org.apache.cassandra.utils.memory.SlabAllocator.setDiscarded(SlabAllocator.java:120)
> at org.apache.cassandra.db.Memtable.setDiscarded(Memtable.java:201)
> at
> org.apache.cassandra.db.ColumnFamilyStore$Flush$1.runMayThrow(ColumnFamilyStore.java:1216)
> at
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
> at
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
> at java.base/java.lang.Thread.run(Thread.java:829)
> {code}
> {code}
> $ nodetool info
> ID :
> Gossip active : true
> Native Transport active: true
> Load : 204.67 GiB
> Generation No : 1670343179
> Uptime (seconds) : 1110514
> Heap Memory (MB) : 7218.07 / 24576.00
> Off Heap Memory (MB) : 784.06
> Data Center : par
> Rack : e1
> Exceptions : 1
> Key Cache : entries 802712, size 100 MiB, capacity 100 MiB,
> 774541004 hits, 914207516 requests, 0.847 recent hit rate, 14400 save period
> in seconds
> Row Cache : entries 0, size 0 bytes, capacity 0 bytes, 0 hits, 0
> requests, NaN recent hit rate, 0 save period in seconds
> Counter Cache : entries 0, size 0 bytes, capacity 50 MiB, 0 hits, 0
> requests, NaN recent hit rate, 7200 save period in seconds
> Percent Repaired : 2.3272298419424144E-5%
> Token : (invoke with -T/--tokens to see all 8 tokens)
> $ java -version
> openjdk version "11.0.16" 2022-07-19 LTS
> OpenJDK Runtime Environment (Red_Hat-11.0.16.0.8-1.el7_9) (build
> 11.0.16+8-LTS)
> OpenJDK 64-Bit Server VM (Red_Hat-11.0.16.0.8-1.el7_9) (build 11.0.16+8-LTS,
> mixed mode, sharing)
> $ nodetool version
> ReleaseVersion: 4.0.6
> {code}
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