Work on HDFS-13150 started by Erik Krogen.
> Create fast path for SbNN tailing edits from JNs
> ------------------------------------------------
>                 Key: HDFS-13150
>                 URL: https://issues.apache.org/jira/browse/HDFS-13150
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs, journal-node, namenode
>            Reporter: Erik Krogen
>            Assignee: Erik Krogen
>            Priority: Major
>         Attachments: edit-tailing-fast-path-design-v0.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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