[jira] [Updated] (HDDS-14424) OM HA: Support Follower Read Phase 1

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

     [ https://issues.apache.org/jira/browse/HDDS-14424?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ivan Andika updated HDDS-14424:
-------------------------------
    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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