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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10322) Strip tags from KV while sending back to client on reads
Date Wed, 15 Jan 2014 04:52:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13871644#comment-13871644
] 

Anoop Sam John commented on HBASE-10322:
----------------------------------------

BTW, the stripping of tags can be achieved by removing the tag from KV by the CP/Filter that
it handles.  This will allow system tags being blocked from sending back and other user tags
getting back to the client. (The decision can be taken by the CP/Filter which handles the
tags)   This was from the begin of our discussions internally here.  Just saying.   The major
concern with that was we will have to recreate KVs (In filter/cp) and byte array copying.
 The perf penalty is a major concern  :(

> 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
>
>
> 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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