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https://issues.apache.org/jira/browse/HBASE-9045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13809496#comment-13809496
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Andrew Purtell commented on HBASE-9045:
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bq. do we always need to compress tag by tag or sometimes the entire tag part
can be compressed. In some cases compressing the entire thing would be simple
and would be better for that scneario I feel. That would imapct the WAL
compresssion also then.
Interesting point. For the case where there's just one tag on the cell, it's
the same, and for cases where there are a number of cells with the exact same
set of tags it would perform better. On the other hand, if cells have many
common tags but the similarities don't coincide on any given cell then the
dictionary will be inefficient compared to the per-tag approach. Probably the
per-tag approach is better for the general case.
> Support Dictionary based Tag compression in HFiles
> --------------------------------------------------
>
> Key: HBASE-9045
> URL: https://issues.apache.org/jira/browse/HBASE-9045
> Project: HBase
> Issue Type: Sub-task
> Affects Versions: 0.98.0
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
> Fix For: 0.98.0
>
> Attachments: HBASE-9045.patch, HBASE-9045_V2.patch
>
>
> Along with the DataBlockEncoding algorithms, Dictionary based Tag compression
> can be done
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