[CASSANDRA-8301] Create a tool that given a bunch of sstables creates a "decent" sstable leveling

• Type: Improvement
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 2.0.13
• Labels: lcs
• Assignee: Marcus Eriksson
• Reporter: Marcus Eriksson

Authors

Marcus Eriksson

Reviewers

Carl Yeksigian

• Created: 12/Nov/14 19:41
• Updated: 16/Apr/19 09:31
• Resolved: 02/Mar/15 11:54

Description

In old versions of cassandra (i.e. not trunk/3.0), when bootstrapping a new node, you will end up with a ton of files in L0 and it might be extremely painful to get LCS to compact into a new leveling

We could probably exploit the fact that we have many non-overlapping sstables in L0, and offline-bump those sstables into higher levels. It does not need to be perfect, just get the majority of the data into L1+ without creating overlaps.

So, suggestion is to create an offline tool that looks at the range each sstable covers and tries to bump it as high as possible in the leveling.

Issue Links

• relates to: CASSANDRA-9588 Make sstableofflinerelevel print stats before relevel