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From "Taylor Cressy (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-14089) Time Window Compaction Strategy: Determine window by column value
Date Sat, 02 Dec 2017 03:54:01 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16275398#comment-16275398
] 

Taylor Cressy edited comment on CASSANDRA-14089 at 12/2/17 3:53 AM:
--------------------------------------------------------------------

Thanks for the info. I initially opened the ticket out of recommendations from some folks
in the community only to find out that this is possible with `USING TIMESTAMP`. 


was (Author: tcressy):
Thanks for the info. I initially opened the ticket out of the recommendation from some folks
in the community only to find out that this is possible with `USING TIMESTAMP`. 

> Time Window Compaction Strategy: Determine window by column value
> -----------------------------------------------------------------
>
>                 Key: CASSANDRA-14089
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14089
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Taylor Cressy
>
> Recently, we came across an issue where we needed to repartition a column family and
alter it's compaction strategy to TWCS. 
> We wanted to ensure that the time series data was bucketized properly into it's appropriate
window when we migrate data from the old CF to the new one. However, there appears to be no
simple way to do this unless we:
> 1) Set the time window to some arbitrary length
> 2) Backload a chunk of the data within that time window 
> 3) After all chunks backload, reset the time window to the desired size
> I propose that we allow TWCS to have the ability to key off a column value for placing
it in a window. 
> Also, maybe we can adjust the TTL accordingly - based on that column value, upon insert
- considering TTLs and TWCS are generally based on some form of business logic. Of course,
the user could calculate the TTL on the fly, but it could be a nice feature.



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