Geoffrey Jacoby created HBASE-23710:
---------------------------------------
Summary: 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
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 colon) that's not used in class names.
The region coprocessor host will parse the priority if present and use it when
instantiating the coproc.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
