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https://issues.apache.org/jira/browse/HBASE-9118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13729857#comment-13729857
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ramkrishna.s.vasudevan commented on HBASE-9118:
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We could use HBASE-9127(something similar) and refactor how mvcc works along
with the tags optimization.
> Optimization in HFile V3 when no tags are present in a file
> -----------------------------------------------------------
>
> Key: HBASE-9118
> URL: https://issues.apache.org/jira/browse/HBASE-9118
> Project: HBase
> Issue Type: Sub-task
> Affects Versions: 0.98.0, 0.95.2
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
>
> Now with V3 we will write tags length (short) along with every KV after value
> bytes. When no tags at all present it will be wasting 2 bytes for every KV.
> We can avoid this. During flush let the tags length be written. In fileInfo
> we can add info like max tags length. During compaction if all the files
> undergoing the compaction having a 0 max tags length, we can avoid writing 2
> bytes (0) along with every KV..
> Note : Similar optimization available with mvcc
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