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https://issues.apache.org/jira/browse/HBASE-11729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14098278#comment-14098278
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Anoop Sam John commented on HBASE-11729:
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Great work Sean!
Just small comment
bq.The number of bytes in the longest tag in this hfile (int)
This info is actually the tags length of the Cell with longest tagsLength. (Not
an individual tags length)
Also FYI.. During compaction, if all the files under compaction having max
tags length as 0, we even skip the 2 bytes tags length part with every KV and
saving that overhead. Absence of MAX_TAGS_LENGTH file info means the Cell
format is just like as in HFile V2
> 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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