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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8496) Implement tags and the internals of how a tag should look like
Date Mon, 05 Aug 2013 19:34:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13729855#comment-13729855
] 

ramkrishna.s.vasudevan commented on HBASE-8496:
-----------------------------------------------

>>Pls note that we would not be persisting any tag related information on the HFileBlock.
HFileBlock would not be modified in terms of what is persisted.  In the recent patch that
we have worked up on we are just enclosing some of the state variables into a POJO.
So specifically for tags there are no modifications on HfileBlock.  So there is no need for
subclassing HFileBlock or add a new version to the hfileblock.
>>Based on the Encoding/Decoding context state the Encoder and decoding logic of the
algos would handle tags.
In the previous version of the patches the includeMemstoreTS and the includeTags created changes
to the interface apis.  So as to avoid this we enclosed these things inside the Context. Iin
the recent patches the context would have the POJO mentioned above).
So from the context we would be able to get the various decision points like to include tags
or not, includememstoreTS or not.
The encoding apis carry the context but the actual seekers that does the actual decoding does
not use contexts.  So we have made changes such that the encoding logic and the seekers use
the context related objects. 
                
> Implement tags and the internals of how a tag should look like
> --------------------------------------------------------------
>
>                 Key: HBASE-8496
>                 URL: https://issues.apache.org/jira/browse/HBASE-8496
>             Project: HBase
>          Issue Type: New Feature
>    Affects Versions: 0.98.0, 0.95.2
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Critical
>         Attachments: Comparison.pdf, HBASE-8496_2.patch, HBASE-8496.patch, Tag design.pdf,
Tag design_updated.pdf, Tag_In_KV_Buffer_For_reference.patch
>
>
> The intent of this JIRA comes from HBASE-7897.
> This would help us to decide on the structure and format of how the tags should look
like. 

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