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https://issues.apache.org/jira/browse/CASSANDRA-19715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17855726#comment-17855726
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Venkata Naladala commented on CASSANDRA-19715:
----------------------------------------------
Thank you for checking this.
I am not really sure. Env var or yaml will make it a node level where the table
option will make it global for the selected table.
This is what we are thinking of.
{{{{compaction = \{ 'class' :
'org.apache.cassandra.db.compaction.TimeWindowCompactionStrategy',
'compaction_window_size' : 1, 'compaction_window_unit' : 'DAYS',
'max_threshold' : 32, 'min_threshold' : 4, 'compaction_window_offset': 4,
'compaction_window_offset_unit': 'HOURS' }}}}}
{{{{compaction_window_offset_unit < compaction_window_unit}}}}
This way, the compaction for the n-1 window happens at 4:00 UTC rather than
00:00 UTC.
> 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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