Andor Molnar created HBASE-29236:
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Summary: Implement ZooKeeper watcher to add ability to flip R/O
flag runtime
Key: HBASE-29236
URL: https://issues.apache.org/jira/browse/HBASE-29236
Project: HBase
Issue Type: Sub-task
Components: Replication, Zookeeper
Reporter: Andor Molnar
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.
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