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https://issues.apache.org/jira/browse/OAK-5167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15708302#comment-15708302
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Francesco Mari commented on OAK-5167:
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I described the role of offline garbage collection at r1772015.
> Document garbage collection
> ---------------------------
>
> Key: OAK-5167
> URL: https://issues.apache.org/jira/browse/OAK-5167
> Project: Jackrabbit Oak
> Issue Type: Sub-task
> Components: doc
> Reporter: Francesco Mari
> Assignee: Francesco Mari
> Fix For: 1.6, 1.5.17
>
>
> Information related to garbage collection for Oak Segment Tar should be
> documented. In particular, the following topics should be treated.
> * Garbage collection - Describe the role of garbage collection.
> ** Generational garbage collection - Outline the basic concepts behind the
> generational garbage collection algorithm.
> ** Estimation, compaction and cleanup - Describe the main phases of garbage
> collection and how they interact with each other.
> ** Offline garbage collection - How offline garbage collection works and what
> to expect from it.
> ** Online garbage collection - Describe the role of online garbage collection
> and the reason why it is needed.
> *** Monitoring the log - The information you can look up in the log about
> garbage collection.
> **** When did garbage collection start?
> **** When did estimation start?
> **** Is estimation disabled?
> **** Was estimation cancelled?
> **** When did estimation complete?
> **** What was the output of estimation?
> **** When did compaction start?
> **** Is compaction disabled?
> **** Was compaction cancelled?
> **** When did compaction complete?
> **** How did compaction cope with concurrent writes?
> **** What was the output of compaction?
> **** When did clean-up start?
> **** Was cleanup cancelled?
> **** When did cleanup complete?
> **** What was the output of cleanup?
> *** Monitoring via JMX - The information you can lookup via JMX about garbage
> collection.
> **** SegmentRevisionGC
> ***** Garbage collection options - Which properties are available for the
> user to get and set, and their impact on garbage collection.
> ***** Start garbage collection - How to manually start garbage collection.
> ***** Garbage collection statistics - Statistics about garbage collection and
> how to interpret them.
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