Jonathan Ellis created CASSANDRA-9829:
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Summary: Dynamically adjust LCS level sizes
Key: CASSANDRA-9829
URL: https://issues.apache.org/jira/browse/CASSANDRA-9829
Project: Cassandra
Issue Type: New Feature
Components: Core
Reporter: Jonathan Ellis
Assignee: Paulo Motta
Fix For: 3.x
LCS works best when the top level is full. Then 90% of reads can be served
from a single sstable. By contrast if the top level is only 10% full then 90%
of reads will be served from two. This results in worse performance as well as
confused users.
To address this, we can adjust the ideal top level size to how much data is
actually in it (and set each corresponding lower level to 1/10 of the next one
above).
(This is an idea [from
rocksdb|https://www.reddit.com/r/IAmA/comments/3de3cv/we_are_rocksdb_engineering_team_ask_us_anything/ct4asen].)
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