Michael Dürig created OAK-2939:
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Summary: Make compaction gain estimate more accurate
Key: OAK-2939
URL: https://issues.apache.org/jira/browse/OAK-2939
Project: Jackrabbit Oak
Issue Type: Sub-task
Components: segmentmk
Reporter: Michael Dürig
Assignee: Michael Dürig
Fix For: 1.3.1
Currently the compaction gain estimation process only takes the current head
into account when calculating the retained size. We could make it more accurate
by also taking in memory references into account. This would prevent compaction
from running when many in memory references would later on prevent segments
from being cleaned up.
Also for OAK-2862, we would need a way to include the segments used for the
persisted compaction map in the retained size.
While at it, we could try to improve logging so information on how much space
is retained by the current head, in memory references and the persisted
compaction map would be logged separately.
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