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https://issues.apache.org/jira/browse/HDDS-14424?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ivan Andika updated HDDS-14424:
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Summary: OM HA: Support Follower Read Phase 1 (was: OM HA Follower Read
Phase 1)
> OM HA: Support Follower Read Phase 1
> ------------------------------------
>
> Key: HDDS-14424
> URL: https://issues.apache.org/jira/browse/HDDS-14424
> Project: Apache Ozone
> Issue Type: Epic
> Reporter: Ivan Andika
> Assignee: Ivan Andika
> Priority: Major
>
> This is epic is to implement features that allow client to read from OM
> followers.
> The purpose of reading from OM followers are
> * Increase resource utilization : increase the overall read throughput to
> overcome the read bottleneck of a single OM leader and increase overall read
> throughput.
> * Improve write throughput: Leader write throughput might also increase
> since it does need to content with reads
> * Reduce read latency (if possible): This can be achieved by reading from
> the nearest follower and avoiding inter DC traffic
> ** If the client and OM leader is in different DC, we can read from OM
> follower
> *** The read payloads for list and get might be big so we can reduce the
> traffic cost
> ** This will be enhanced if we can support follower reads that do not need
> to talk to the leader for each read request (e.g. through ReadIndex) by
> sacrificing some consistency
> This is not limited to linearizable reads. In the future, we can support
> weaker consistency such as bounded staleness.
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