[jira] [Created] (HDDS-12307) Realtime Cross-Region Bucket Replication

["Ivan Andika (Jira)" <ji...@apache.org>]

Ivan Andika created HDDS-12307:
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             Summary: Realtime Cross-Region Bucket Replication
                 Key: HDDS-12307
                 URL: https://issues.apache.org/jira/browse/HDDS-12307
             Project: Apache Ozone
          Issue Type: New Feature
            Reporter: Ivan Andika
            Assignee: Ivan Andika


Currently, there are a few cross-regions (geo-replicated) DR solution for Ozone bucket
 * Run a periodic distcp from the source bucket to the target bucket
 * Take a snapshot on the bucket and send it to the remote site DR sites ([https://ozone.apache.org/docs/edge/feature/snapshot.html])

There are pros and cons for the current approach
 * Pros
 ** It is simpler: Setting up periodic jobs can be done quite easily (e.g. using cronjobs)
 ** Distcp implementation will setup a map reduce jobs that will parallelize the copy from the source and the cluster
 ** No additional components needed
 * Cons

 ** It is not “realtime”: The freshness of the data depends on how frequent and how fast the distcp runs
 ** It incurs significant overhead to the source cluster: It requires scanning of all the files in the source cluster (possibly in the target cluster)

Cloudera Replication Manager ([https://docs.cloudera.com/replication-manager/1.5.4/replication-policies/topics/rm-pvce-understand-ozone-replication-policy.html)] adds an incremental replication support after the initial bootstrap step by taking the snapdiff between two snapshots. This is better since there are no need to list all the keys under the bucket again, but it's not technically realtime.

This ticket is track possible solutions for a realtime bucket async replication between two clusters in different regions (with 100+ms latency).



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