[jira] [Commented] (HBASE-4507) Create checkAndPut variant that exposes timestamp / UUID

["stack (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-4507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13118498#comment-13118498 ] 

stack commented on HBASE-4507:
------------------------------

bq. Do we really need to modify checkAndPut here?

checkAndPut as is has a hole in that an update that writes the same value will go unnoticed.

bq. I think it's safer to have explicit sequence IDs for the META rows and use the existing checkAndPut. Unless there's some reason that won't work, I don't think it's necessary to change a core function for this?

So, each time we set a region location (hostname + port + startcode), we'd also update a new column, say info:editid, which would have a uuid value.  We'd then do checkAndPut on the info:editid column?

We'd still need to read whatever this value was at start of region open.

I could work up a patch for this over in hbase-4497 if its preferred.

Regards atomicMutation, that would be a nice improvement.  Would deprecate current APIs in favor of it going forward.  Lets open a new issue to do that.


                
> Create checkAndPut variant that exposes timestamp / UUID
> --------------------------------------------------------
>
>                 Key: HBASE-4507
>                 URL: https://issues.apache.org/jira/browse/HBASE-4507
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Ted Yu
>            Assignee: stack
>
> Michael checked the checkAndPut which doesn't expose timestamp. A variant of checkAndPut should be created to expose timestamp which is written into a column specified by additional parameters.

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