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From: "Michael Segel  (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-12853) distributed write pattern to
 replace ad hoc 'salting'
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    [ https://issues.apache.org/jira/browse/HBASE-12853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14649304#comment-14649304 ] 

Michael Segel  commented on HBASE-12853:
----------------------------------------

Lars, 

If I respond, I'll be called argumentative. If I don't respond, it will leave readers with the incorrect perception. 

Again, Apache does not indemnify the contributor, leaving you with risk.  You need to balance that risk against the benefits of contributing. 

Its a lot simpler to say "Apache won't indemnify me..." than to continually having to write out long paragraphs as to why and what that really means. Either you get it or you don't.  Most of the committers here don't run their own shop or have to deal with the business side of software. 




> distributed write pattern to replace ad hoc 'salting'
> -----------------------------------------------------
>
>                 Key: HBASE-12853
>                 URL: https://issues.apache.org/jira/browse/HBASE-12853
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Michael Segel 
>             Fix For: 2.0.0
>
>
> In reviewing HBASE-11682 (Description of Hot Spotting), one of the issues is that while 'salting' alleviated  regional hot spotting, it increased the complexity required to utilize the data.  
> Through the use of coprocessors, it should be possible to offer a method which distributes the data on write across the cluster and then manages reading the data returning a sort ordered result set, abstracting the underlying process. 
> On table creation, a flag is set to indicate that this is a parallel table. 
> On insert in to the table, if the flag is set to true then a prefix is added to the key.  e.g. <region server#>- or <region server #|| where the region server # is an integer between 1 and the number of region servers defined.  
> On read (scan) for each region server defined, a separate scan is created adding the prefix. Since each scan will be in sort order, its possible to strip the prefix and return the lowest value key from each of the subsets. 



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