Andor Molnar created HBASE-29081:
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Summary: Add HBase Read Replica Cluster feature
Key: HBASE-29081
URL: https://issues.apache.org/jira/browse/HBASE-29081
Project: HBase
Issue Type: Umbrella
Components: Replication
Reporter: Andor Molnar
h1. Objective
We’d like to implement the open source version of Amazon’s[ Read Replica
Cluster on
S3|https://aws.amazon.com/blogs/big-data/setting-up-read-replica-clusters-with-hbase-on-amazon-s3/]
feature for Apache HBase. It adds the ability of running another HBase
cluster on the same cloud storage location in read-only mode, allowing users to
share the read workload between multiple clusters. Due to the characteristics
of the implementation and the lack of automated synchronization between the
active and read-replica clusters, read replicas are eventually consistent,
hence they’re not suitable for reading most recent data. However we still
believe that users of open source Apache HBase could take advantage of this
feature and there’re use cases out there which read replicas could help with.
Please find more information about the feature in the linked blog post.
h1. Pros
* Running multiple clusters in different Availability Zones adds HA to the
entire workload,
* No need for data movement or duplication (active-active replication setup)
which is cost and time efficient,
* No limit for the number of read replica clusters
h1. Cons
* Read Replica clusters are eventually consistent: in memory data is not
visible from read replicas,
* Read Replica clusters must be manually refreshed: flush on active cluster,
refresh hfiles/meta on read replicas
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