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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:
-----------------------------------
Description:
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.
was:
We'd like to implement a switch within hbase and expose as hbase shell command
to flip the R/O flag on the fly without the need for restarting HBase.
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.
> 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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