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https://issues.apache.org/jira/browse/HBASE-3256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12973477#action_12973477
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HBase Review Board commented on HBASE-3256:
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Message from: "Gary Helmling" <ghelml...@gmail.com>
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http://review.cloudera.org/r/1321/#review2130
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src/main/java/org/apache/hadoop/hbase/coprocessor/CoprocessorHost.java
<http://review.cloudera.org/r/1321/#comment6621>
It actually means "region". That conf key is only used for the system
coprocessors loaded on regions.
I'll change the name (and config property).
src/main/java/org/apache/hadoop/hbase/coprocessor/CoprocessorHost.java
<http://review.cloudera.org/r/1321/#comment6622>
Yes, I'm not sure what the original intent was here, obtaining the CP
without the full package name?
Maybe getClass().getSimpleName().equals() would be better?
src/main/java/org/apache/hadoop/hbase/master/HMaster.java
<http://review.cloudera.org/r/1321/#comment6623>
This is the result of env.shouldBypass(), in order to allow a
MasterObserver to bypass the normal balance() processing.
src/main/java/org/apache/hadoop/hbase/master/HMaster.java
<http://review.cloudera.org/r/1321/#comment6624>
Right, that's the only way to modify the input. Will change.
src/main/java/org/apache/hadoop/hbase/master/HMaster.java
<http://review.cloudera.org/r/1321/#comment6628>
I can add in env.shouldBypass() handling here to allow overriding.
Combined with access to ServerManager through MasterServices, this should allow
custom assignment policies.
src/main/java/org/apache/hadoop/hbase/master/HMaster.java
<http://review.cloudera.org/r/1321/#comment6629>
Yes, will add in env.shouldBypass() handling here too.
- Gary
> Coprocessors: Coprocessor host and observer for HMaster
> -------------------------------------------------------
>
> Key: HBASE-3256
> URL: https://issues.apache.org/jira/browse/HBASE-3256
> Project: HBase
> Issue Type: Sub-task
> Reporter: Andrew Purtell
> Assignee: Gary Helmling
> Fix For: 0.92.0
>
> Attachments: HBASE-3256_initial.patch
>
>
> Implement a coprocessor host for HMaster. Hook observers into administrative
> operations performed on tables: create, alter, assignment, load balance, and
> allow observers to modify base master behavior. Support automatic loading of
> coprocessor implementation.
> Consider refactoring the master coprocessor host and regionserver coprocessor
> host into a common base class.
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