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https://issues.apache.org/jira/browse/HDDS-14379?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ivan Andika updated HDDS-14379:
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Component/s: OM HA
Ozone Client
> Implement basic Hadoop OM client proxy provider to read from followers
> ----------------------------------------------------------------------
>
> Key: HDDS-14379
> URL: https://issues.apache.org/jira/browse/HDDS-14379
> Project: Apache Ozone
> Issue Type: New Feature
> Components: OM HA, Ozone Client
> Reporter: Ivan Andika
> Assignee: Ivan Andika
> Priority: Major
>
> This task is to come up with the basic implementation of follower read client
> proxy as a baseline before further performance improvements. The idea is to
> simply pick a OM node in random (which be leader or follower / listener) and
> use it to submit read requests. If the chosen OM node is a follower, the read
> requests need to keep sending to that OM node unless the OM is down which
> triggers failover. Write requests should be sent to the OM leader directly.
> Further improvements such as adding OM probe logic will be implemented in
> follow up tasks.
> The implementation is to introduce HadoopRpcOMFollowerReadProxyProvider which
> wraps
> HadoopRpcOMFailoverProxyProvider. FollowerReadProxyProvider tracks a
> different currentOmNodeId from HadoopRpcOMFailoverProxyProvider.
> FollowerReadInvocationHandler will check whether the request is a read
> request (using OmUtils#isReadOnly) and if so forwards it to its current
> proxy. If it's a write request, the request if forwarded to
> HadoopRpcOMFailoverProxyProvider to be sent to the leader.
> So the proxy hierarchy is
> * RetryProxy
> ** HadoopRpcOMFollowerReadProxyProvider
> *** HadoopRpcOMFailoverProxyProvider
>
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