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https://issues.apache.org/jira/browse/HDFS-12977?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HDFS-12977 started by Plamen Jeliazkov.
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> Add stateId to RPC headers.
> ---------------------------
>
>                 Key: HDFS-12977
>                 URL: https://issues.apache.org/jira/browse/HDFS-12977
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ipc, namenode
>            Reporter: Konstantin Shvachko
>            Assignee: Plamen Jeliazkov
>            Priority: Major
>         Attachments: HDFS_12977.trunk.001.patch, HDFS_12977.trunk.002.patch, 
> HDFS_12977.trunk.003.patch, HDFS_12977.trunk.004.patch
>
>
> stateId is a new field in the RPC headers of NameNode proto calls.
> stateId is the journal transaction Id, which represents LastSeenId for the 
> clients and LastWrittenId for NameNodes. See more in [reads from Standby 
> design 
> doc|https://issues.apache.org/jira/secure/attachment/12902925/ConsistentReadsFromStandbyNode.pdf].



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