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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