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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18775) Add a Global Read-Only property to turn off all writes for the cluster
Date Fri, 22 Sep 2017 23:43:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16177341#comment-16177341

stack commented on HBASE-18775:

Should writeup the ZK tendency (and all others -- smile).

You tell me, but I was hoping a single read-only flag would do for all cases. If set on the
region level, it'd not allow writes. If set on the process level (in the hbase-*.xml), then
the process would not take writes (if a regionserver, it'd pass the read-only=true to all
hosted regions, if a master, it'd disallow writes).

Could be an issue if region-replicas want to turn off read-only for whatever reason but hopefully
the process-level flag would then prevail.

Just trying to  have a single flag if possible (I think I got this notion from you, a review
you did of m master not-carrying-regions review -- smile).

> Add a Global Read-Only property to turn off all writes for the cluster
> ----------------------------------------------------------------------
>                 Key: HBASE-18775
>                 URL: https://issues.apache.org/jira/browse/HBASE-18775
>             Project: HBase
>          Issue Type: Sub-task
>          Components: master, regionserver
>    Affects Versions: HBASE-18477
>            Reporter: Zach York
>            Assignee: Zach York
>         Attachments: HBASE-18775.HBASE-18477.001.patch, HBASE-18775.HBASE-18477.002.patch,
HBASE-18775.HBASE-18477.003.patch, HBASE-18775.HBASE-18477.004.patch
> As part of HBASE-18477, we need a way to turn off all modification for a cluster. This
patch extends the read only mode used by replication to disable all data and metadata operations.

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