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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10322) Strip tags from KV while sending back to client on reads
Date Mon, 20 Jan 2014 19:13:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13876734#comment-13876734
] 

Lars Hofhansl commented on HBASE-10322:
---------------------------------------

Good summary. (And I'm really just a bystander here.)
It's simplest to keep tag server-only unless there is a compelling argument to do differently.
A compelling argument might eventually be that code outside of HBase needs to check/manipulate
tags.

> Strip tags from KV while sending back to client on reads
> --------------------------------------------------------
>
>                 Key: HBASE-10322
>                 URL: https://issues.apache.org/jira/browse/HBASE-10322
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.98.0
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>            Priority: Blocker
>             Fix For: 0.98.0, 0.99.0
>
>         Attachments: HBASE-10322.patch, HBASE-10322_V2.patch, HBASE-10322_codec.patch
>
>
> Right now we have some inconsistency wrt sending back tags on read. We do this in scan
when using Java client(Codec based cell block encoding). But during a Get operation or when
a pure PB based Scan comes we are not sending back the tags.  So any of the below fix we have
to do
> 1. Send back tags in missing cases also. But sending back visibility expression/ cell
ACL is not correct.
> 2. Don't send back tags in any case. This will a problem when a tool like ExportTool
use the scan to export the table data. We will miss exporting the cell visibility/ACL.
> 3. Send back tags based on some condition. It has to be per scan basis. Simplest way
is pass some kind of attribute in Scan which says whether to send back tags or not. But believing
some thing what scan specifies might not be correct IMO. Then comes the way of checking the
user who is doing the scan. When a HBase super user doing the scan then only send back tags.
So when a case comes like Export Tool's the execution should happen from a super user.
> So IMO we should go with #3.
> Patch coming soon.



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