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https://issues.apache.org/jira/browse/HBASE-29083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17923495#comment-17923495
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Andor Molnar edited comment on HBASE-29083 at 2/3/25 10:03 PM:
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* So if we want to switch the state, we need to change the property and perform
a restart?
Not necessarily have to restart it, I'm not sure. I think it's acceptable to
require restart, but if we can do it without it, would be great.
* Do clusters participating on a "read replica" group know about each other?
Yet I don't see a reason for why they should, so hopefully we're fine without
such synchronization.
* How can we validate that no more than one participating cluster is in
non-readonly mode?
One idea: active cluster "registers" itself by adding a file somewhere to the
common storage tree which can be detected by others and prevent starting in
read-write mode.
was (Author: andorm):
* So if we want to switch the state, we need to change the property and perform
a restart?
Not necesseraliy have to restart it, I'm not sure. I think it's acceptable to
require restart, but if we can do it without it, would be great.
* Do clusters participating on a "read replica" group know about each other?
Yet I don't see a reason for why they should, so hopefully we're fine without
such synchronization.
* How can we validate that no more than one participating cluster is in
non-readonly mode?
One idea: active cluster "registers" itself by adding a file somewhere to the
common storage tree which can be detected by others and prevent starting in
read-write mode.
> Add global read-only mode to HBase
> ----------------------------------
>
> Key: HBASE-29083
> URL: https://issues.apache.org/jira/browse/HBASE-29083
> Project: HBase
> Issue Type: Sub-task
> Components: master
> Reporter: Andor Molnar
> Assignee: Anuj Sharma
> Priority: Major
>
> Implement *read-only* mode for HBase. Can be set at the start of the cluster
> or rolling restart.
> New config setting:
> |*Config*|*Default* |*Explanation*|
> |hbase.global.readonly.enabled|false|Puts the entire cluster into read-only
> mode.|
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