[jira] [Created] (CASSANDRA-19715) TWCS - Provide a flag to pick a time when compaction happens for the n-1 window

["Venkata Naladala (Jira)" <ji...@apache.org>]

Venkata Naladala created CASSANDRA-19715:
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             Summary: 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


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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