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https://issues.apache.org/jira/browse/CASSANDRA-19715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17855718#comment-17855718
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Michael Semb Wever commented on CASSANDRA-19715:
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Where would this flag be set ? (env var or yaml?)
And to be clear, this is not about shifting the time window, just when the TWCS
compaction is initiated, so that it's delayed around the cluster, right ?
> TWCS - Provide a flag to pick a time when compaction happens for the n-1
> window
> -------------------------------------------------------------------------------
>
> Key: CASSANDRA-19715
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19715
> Project: Cassandra
> Issue Type: New Feature
> Reporter: Venkata Naladala
> Priority: Normal
>
> Below are the settings for the TWCS. With the settings below, the compaction
> for the n-1 window happens at around 00:00 UTC on all the nodes in the
> cluster. This causes a spike in IO utilization on the entire cluster, which
> in turn increases the read latencies.
> {{{}compaction = { 'class' :
> 'org.apache.cassandra.db.compaction.TimeWindowCompactionStrategy',
> 'compaction_window_size' : 1, 'compaction_window_unit' : 'DAYS',
> 'max_threshold' : 32, 'min_threshold' : 4{}}}}
> Requesting to provide a new option for TWCS where we can specify when the
> compaction for n-1 window happens. This way, we can provide a custom time
> instead of the default time(beginning of the new window) so that we can pick
> low-traffic hours and avoid impacting the customer.
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