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https://issues.apache.org/jira/browse/HDFS-13150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17423048#comment-17423048
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Konstantin Shvachko commented on HDFS-13150:
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We end up implementing quorum read from JNs for Observer fast path.
You should check the code [~liutongwei]
> [Edit Tail Fast Path] Allow SbNN to tail in-progress edits from JN via RPC
> --------------------------------------------------------------------------
>
> Key: HDFS-13150
> URL: https://issues.apache.org/jira/browse/HDFS-13150
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha, hdfs, journal-node, namenode
> Reporter: Erik Krogen
> Assignee: Erik Krogen
> Priority: Major
> Fix For: HDFS-12943, 3.3.0
>
> Attachments: edit-tailing-fast-path-design-v0.pdf,
> edit-tailing-fast-path-design-v1.pdf, edit-tailing-fast-path-design-v2.pdf
>
>
> In the interest of making coordinated/consistent reads easier to complete
> with low latency, it is advantageous to reduce the time between when a
> transaction is applied on the ANN and when it is applied on the SbNN. We
> propose adding a new "fast path" which can be used to tail edits when low
> latency is desired. We leave the existing tailing logic in place, and fall
> back to this path on startup, recovery, and when the fast path encounters
> unrecoverable errors.
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