[jira] [Created] (HBASE-18477) Umbrella JIRA for HBase Read Replica clusters

["Zach York (JIRA)" <ji...@apache.org>]

Zach York created HBASE-18477:
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             Summary: 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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