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https://issues.apache.org/jira/browse/HDFS-16669?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simbarashe Dzinamarira reassigned HDFS-16669:
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Assignee: Simbarashe Dzinamarira
> Enhance client protocol to propagate last seen state IDs for multiple
> nameservices.
> -----------------------------------------------------------------------------------
>
> Key: HDFS-16669
> URL: https://issues.apache.org/jira/browse/HDFS-16669
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Simbarashe Dzinamarira
> Assignee: Simbarashe Dzinamarira
> Priority: Major
>
> The RPCHeader in the client protocol currently contains a single value to
> indicate the last seen state ID for a namenode.
> {noformat}
> optional int64 stateId = 8; // The last seen Global State ID
> {noformat}
> When there are multiple namenodes, such as in router based federation, the
> headers need to carry the state IDs for each of these nameservices that are
> part of the federation.
> This change is a prerequisite for HDFS-15522: RBF: Support observer node from
> Router-Based Federation
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