Dan Kinder created CASSANDRA-13943:
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Summary: 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
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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