[jira] [Resolved] (HDFS-13150) [Edit Tail Fast Path] Allow SbNN to tail in-progress edits from JN via RPC

["Erik Krogen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-13150?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Erik Krogen resolved HDFS-13150.
--------------------------------
       Resolution: Fixed
    Fix Version/s: HDFS-12943

Closing this as all sub-issues (HDFS-13607, HDFS-13608, HDFS-13609, HDFS-13610) have been completed. Thanks to all who helped with this new feature!

> [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
>
>         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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