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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 resolved CASSANDRA-9914.
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Resolution: Duplicate
> 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
> Assignee: Marcus Eriksson
> Fix For: 2.1.x
>
> Attachments: cass_high_cpu.png, high_pending_compactions.txt
>
>
> We have a 3-node test cluster (initially running 2.1.8) 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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