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https://issues.apache.org/jira/browse/HBASE-29236?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kevin Geiszler updated HBASE-29236:
-----------------------------------
Resolution: Fixed
Status: Resolved (was: Patch Available)
> Add Support for Dynamic Configuration at the Coprocessor Level
> --------------------------------------------------------------
>
> Key: HBASE-29236
> URL: https://issues.apache.org/jira/browse/HBASE-29236
> Project: HBase
> Issue Type: Sub-task
> Components: Replication
> Reporter: Andor Molnar
> Assignee: Kevin Geiszler
> Priority: Major
> Labels: pull-request-available
>
> We'd like to implement a switch within HBase and expose it as an HBase shell
> command to flip the Read-Only flag on the fly without the need for restarting
> HBase.
>
> Updated ticket description:
> After some discussion, we decided to use Dynamic Configuration to flip this
> R/O flag. The R/O flag is handled by the ReadOnlyController coprocessor.
> Dynamic Configuration does not currently work with coprocessors, so this task
> adds that support and also uses the ReadOnlyController as an example
> implementation.
>
> Original ticket description:
> Idea is to have a ZooKeeper znode which by default has the value read from
> hbase-site.xml file and all HBase nodes will monitor it for changes. HBase
> shell will be able to change the value of znode which will be detected by RSs
> and enable or disable write queries accordingly.
> This change will not be reflected in hbase-site.xml, so user has to manually
> change config files if wants it to be persisted.
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