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Posted to commits@cassandra.apache.org by "Björn Hegerfors (JIRA)" <ji...@apache.org> on 2015/04/20 13:25:58 UTC

[jira] [Created] (CASSANDRA-9211) Keep history of SSTable metadata

Björn Hegerfors created CASSANDRA-9211:
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             Summary: Keep history of SSTable metadata
                 Key: CASSANDRA-9211
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9211
             Project: Cassandra
          Issue Type: Wish
            Reporter: Björn Hegerfors


Similar to the request in CASSANDRA-8078, I'm interested in SSTables' lineage. Specifically, I want to visualize the behaviors of compaction strategies based on real data. For example, for STCS I might want to generate something like this image: http://www.datastax.com/wp-content/uploads/2011/10/size-tiered-1.png. For LCS and DTCS, other properties than size are interesting.

As Marcus responded in CASSANDRA-8078, there is already tracking of ancestors in the SSTable metadata. But as far as I know, the metadata gets garbage collected along with the SSTable itself. So what I propose is to persist metadata in a system table. Maybe some, maybe all metadata. Like the compaction_history table, this should have a default TTL of something like one week or just one day. But users can freely modify/remove the TTL.



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