• Type: Sub-task
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 1.5.17, 1.6.0
    • Component/s: doc, segment-tar
    • Labels:


      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.




            • Assignee:
              frm Francesco Mari
              frm Francesco Mari
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              • Created: