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Posted to commits@cassandra.apache.org by "Jeremy Hanna (JIRA)" <ji...@apache.org> on 2018/01/15 19:45:00 UTC
[jira] [Updated] (CASSANDRA-13943) Infinite compaction of L0
SSTables in JBOD
[ https://issues.apache.org/jira/browse/CASSANDRA-13943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jeremy Hanna updated CASSANDRA-13943:
-------------------------------------
Labels: jbod-aware-compaction (was: )
> Infinite compaction of L0 SSTables in JBOD
> ------------------------------------------
>
> Key: CASSANDRA-13943
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13943
> Project: Cassandra
> Issue Type: Bug
> Components: Compaction
> Environment: Cassandra 3.11.0 / Centos 6
> Reporter: Dan Kinder
> Assignee: Marcus Eriksson
> Priority: Major
> Labels: jbod-aware-compaction
> Attachments: cassandra-jstack-2017-10-12-infinite-sstable-adding.txt, cassandra-jstack-2017-10-12.txt, cassandra.yaml, debug.log, debug.log-with-commit-d8f3f2780, debug.log.1.zip, debug.log.zip, jvm.options
>
>
> I recently upgraded from 2.2.6 to 3.11.0.
> I am seeing Cassandra loop infinitely compacting the same data over and over. Attaching logs.
> It is compacting two tables, one on /srv/disk10, the other on /srv/disk1. It does create new SSTables but immediately recompacts again. Note that I am not inserting anything at the moment, there is no flushing happening on this table (Memtable switch count has not changed).
> My theory is that it somehow thinks those should be compaction candidates. But they shouldn't be, they are on different disks and I ran nodetool relocatesstables as well as nodetool compact. So, it tries to compact them together, but the compaction results in the exact same 2 SSTables on the 2 disks, because the keys are split by data disk.
> This is pretty serious, because all our nodes right now are consuming CPU doing this for multiple tables, it seems.
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