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https://issues.apache.org/jira/browse/HBASE-11729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14098562#comment-14098562
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Anoop Sam John commented on HBASE-11729:
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bq.How does the writer know if it's in a compaction vs a flush?
The writer decided whether to write the tags part (0 length atleast) based on
HFileContext#isIncludesTags()
Up the layer, during flush this will be true.
In compaction we check the MAX_TAGS_LENGTH and decide.
> Document HFile v3
> -----------------
>
> Key: HBASE-11729
> URL: https://issues.apache.org/jira/browse/HBASE-11729
> Project: HBase
> Issue Type: Task
> Components: documentation, HFile
> Affects Versions: 0.98.0
> Reporter: Sean Busbey
> Assignee: Sean Busbey
> Priority: Trivial
> Labels: beginner
> Attachments: HBASE-11729.patch, HBASE-11729.pdf
>
>
> 0.98 added HFile v3. There are a couple of mentions of it in the book on the
> sections on cell tags, but there isn't an actual overview or design
> explanation like there is for [HFile
> v2|http://hbase.apache.org/book/hfilev2.html].
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