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https://issues.apache.org/jira/browse/CASSANDRA-9914?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robbie Strickland updated CASSANDRA-9914:
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Attachment: high_pending_compactions.txt
> Millions of fake pending compaction tasks + high CPU
> ----------------------------------------------------
>
> Key: CASSANDRA-9914
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9914
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: CentOS
> Reporter: Robbie Strickland
> Attachments: high_pending_compactions.txt
>
>
> We have a 3-node test cluster with *zero traffic* and about 10GB of data on
> each node. It's showing millions of pending compaction tasks (but no actual
> work in progress), and the CPUs are pegged on all three nodes. The task
> count goes down rapidly, but then jumps back up again seconds later. All
> tables are set to STCS. The issue persists after restart, but takes a few
> minutes before it becomes a problem. SSTable counts are below 10 for every
> table. We're also seeing 20s Old Gen GC pauses about every 2-3 mins.
> This started happening after bulk loading some old data. We started seeing
> very long GC pauses (sometimes 30 min or more) that would bring down the
> nodes. We then truncated this table, which resulted in the current behavior.
> We attempted to roll back our cluster to 2.1.7 patched with CASSANDRA-9637,
> but we observed the same behavior.
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