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From Nate McCall <zznat...@gmail.com>
Subject Re: STCS in L0 behaviour
Date Thu, 24 Nov 2016 20:53:33 GMT
> The reason is described here:
https://issues.apache.org/jira/browse/CASSANDRA-5371?focusedCommentId=13621679&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13621679
>
> /Marcus

"...a lot of the work you've done you will redo when you compact your now
bigger L0 sstable against L1."

^ Sylvain's hypothesis (next comment down) is actually something we see
occasionally in practice: having to re-write the contents of L1 too often
when large L0 SSTables are pulled in. Here is an example we took on a
system with pending compaction spikes that was seeing this specific issue
with four LCS-based tables:

https://gist.github.com/zznate/d22812551fa7a527d4c0d931f107c950

The significant part of this particular workload is a burst of heavy writes
from long-duration scheduled jobs.

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