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https://issues.apache.org/jira/browse/HBASE-15359?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell closed HBASE-15359.
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> Simplifying Segment hierarchy
> -----------------------------
>
> Key: HBASE-15359
> URL: https://issues.apache.org/jira/browse/HBASE-15359
> Project: HBase
> Issue Type: Sub-task
> Reporter: Eshcar Hillel
> Assignee: Eshcar Hillel
> Priority: Major
> Fix For: 2.0.0
>
> Attachments: HBASE-14918-FIX-SEGMENT.patch, HBASE-15359-V01.patch
>
>
> Now that it is clear that no memstore segment will be implemented as an
> HFIle, and that all segments store their data in some representation of
> CellSet (skip-list or flat), the segment hierarchy can be much simplified.
> The attached patch includes only 3 classes in the hierarchy:
> Segment - comprises most of the state and implementation
> MutableSegment - extends API with add and rollback functionality
> ImmutableSegment - extends API with key-value scanner for snapshot
> SegmentScanner is the scanner for all types of segments.
> In addition, the option to rollback immutable segment in the memstore is
> disabled.
> This code would allow us to make progress independently in the compaction
> subtask (HBASE-14920) and the flat index representation subtask
> (HBASE-14921). It also means that the new immutable segment can reuse the
> existing SegmentScanner, instead of implementing a new scanner.
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