Simbarashe Dzinamarira created HDFS-16669:
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Summary: 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
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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