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From "Jerry He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11201) Enable global procedure members to return values to procedure master
Date Tue, 03 Jun 2014 20:12:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14017075#comment-14017075

Jerry He commented on HBASE-11201:

Hi, [~yuzhihong@gmail.com]
I attached addendum-allow-null-data-from-member.patch. This makes the master coordinator tolerate
null data from the procedure member.
It will help in such case:
The hmaster is updated with the patch, but some region servers have not.  
After this addendum, snapshot (or old procedure) will not fail during the scenario described.

> Enable global procedure members to return values to procedure master
> --------------------------------------------------------------------
>                 Key: HBASE-11201
>                 URL: https://issues.apache.org/jira/browse/HBASE-11201
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Jerry He
>            Assignee: Jerry He
>             Fix For: 0.99.0
>         Attachments: HBASE-11201-trunk-v1.patch, HBASE-11201-trunk-v2.patch, HBASE-11201-trunk-v3.patch,
addendum-allow-null-data-from-member.patch, addendum.patch
> Currently in the global procedure framework, the procedure coordinator can send data
(procedure argument) to the members when starting procedure.
> But we don't support getting data returned from the procedure members back to the master.
> Similar to RPC and normal procedure/function calls, in many cases, this is a useful capability.
> The infrastructure is in place. We just need to plug in the holes and make it happen.

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