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https://issues.apache.org/jira/browse/HBASE-23710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17022892#comment-17022892
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Hudson commented on HBASE-23710:
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Results for branch branch-1
[build #1210 on
builds.a.o|https://builds.apache.org/job/HBase%20Nightly/job/branch-1/1210/]:
(/) *{color:green}+1 overall{color}*
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details (if available):
(/) {color:green}+1 general checks{color}
-- For more information [see general
report|https://builds.apache.org/job/HBase%20Nightly/job/branch-1/1210//General_Nightly_Build_Report/]
(/) {color:green}+1 jdk7 checks{color}
-- For more information [see jdk7
report|https://builds.apache.org/job/HBase%20Nightly/job/branch-1/1210//JDK7_Nightly_Build_Report/]
(/) {color:green}+1 jdk8 hadoop2 checks{color}
-- For more information [see jdk8 (hadoop2)
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(/) {color:green}+1 source release artifact{color}
-- See build output for details.
> Priority configuration for system coprocessors
> ----------------------------------------------
>
> Key: HBASE-23710
> URL: https://issues.apache.org/jira/browse/HBASE-23710
> Project: HBase
> Issue Type: New Feature
> Components: Coprocessors
> Reporter: Geoffrey Jacoby
> Assignee: Geoffrey Jacoby
> Priority: Major
> Fix For: 3.0.0, 2.3.0, 1.6.0, 2.2.3, 2.1.9
>
> Attachments: HBASE-23710-master.v01.patch,
> HBASE-23710.branch-1.000.patch, HBASE-23710.v1.branch-1.patch
>
>
> Currenty HBase allows operators to set system region coprocessors via
> hbase-site.xml to be loaded on each table in a cluster (or alternately, all
> tables but system tables). HBase assumes that the first loaded system
> coprocessor gets the first, or SYSTEM priority, with each subsequent system
> coproc getting incremented by 1. As a reminder, in HBase _lower_ priorities
> go first.
> It can be useful for an operator to be able to define a coprocessor on each
> table that needs a different priority. For example, an operator might want a
> coproc to load on each table _last_, so that it can enforce some system
> invariant and know that no other coproc will interfere with it.
> I propose adding optional priority config to the hbase-site.xml
> configuration, separated from each coproc class in the comma-separated list
> by a special character (perhaps a pipe, such as table coprocs use) that's not
> used in class names.
> The region coprocessor host will parse the priority if present and use it
> when instantiating the coproc.
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