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https://issues.apache.org/jira/browse/HBASE-23710?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Geoffrey Jacoby updated HBASE-23710:
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Attachment: HBASE-23710-master.v01.patch
> 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
> Attachments: HBASE-23710-master.v01.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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