Sean Busbey commented on HBASE-18477:

sorry for the lag here Zach. I'd like to see a problem statement, sketch of the 
approach, and considerations for upgrades, testing, and downstream facing 
documentation. Ideally also some coarse-grained milestones that can be used to 
judge if things are progressing. I tried to make the scope document attached to 
HBASE-18405 have all the kinds of things I'd like to see. (even though e.g. 
there is no upgrade concern with that feature since it is green-field.)

> Umbrella JIRA for HBase Read Replica clusters
> ---------------------------------------------
>                 Key: HBASE-18477
>                 URL: https://issues.apache.org/jira/browse/HBASE-18477
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Zach York
>            Assignee: Zach York
> Recently, changes (such as HBASE-17437) have unblocked HBase to run with a 
> root directory external to the cluster (such as in Amazon S3). This means 
> that the data is stored outside of the cluster and can be accessible after 
> the cluster has been terminated. One use case that is often asked about is 
> pointing multiple clusters to one root directory (sharing the data) to have 
> read resiliency in the case of a cluster failure.
> This JIRA is an umbrella JIRA to contain all the tasks necessary to create a 
> read-replica HBase cluster that is pointed at the same root directory.
> This requires making the Read-Replica cluster Read-Only (no metadata 
> operation or data operations).
> Separating the hbase:meta table for each cluster (Otherwise HBase gets 
> confused with multiple clusters trying to update the meta table with their ip 
> addresses)
> Adding refresh functionality for the meta table to ensure new metadata is 
> picked up on the read replica cluster.
> Adding refresh functionality for HFiles for a given table to ensure new data 
> is picked up on the read replica cluster.
> This can be used with any existing cluster that is backed by an external 
> filesystem.
> Please note that this feature is still quite manual (with the potential for 
> automation later).
> More information on this particular feature can be found here: 
> https://aws.amazon.com/blogs/big-data/setting-up-read-replica-clusters-with-hbase-on-amazon-s3/

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