[jira] [Updated] (HDFS-6038) JournalNode hardcodes NameNodeLayoutVersion in the edit log file

["Jing Zhao (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-6038?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jing Zhao updated HDFS-6038:
----------------------------

    Attachment: HDFS-6038.000.patch

A simple way to fix is to pass the LayoutVerison to JNs when starting a new segment. Upload an initial patch to do this.

> JournalNode hardcodes NameNodeLayoutVersion in the edit log file
> ----------------------------------------------------------------
>
>                 Key: HDFS-6038
>                 URL: https://issues.apache.org/jira/browse/HDFS-6038
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, ha, hdfs-client, namenode
>            Reporter: Haohui Mai
>            Assignee: Jing Zhao
>         Attachments: HDFS-6038.000.patch
>
>
> In HA setup, the JNs receive edit logs (blob) from the NN and write into edit log files. In order to write well-formed edit log files, the JNs prepend a header for each edit log file.
> The problem is that the JN hard-codes the version (i.e., {{NameNodeLayoutVersion}} in the edit log, therefore it generates incorrect edit logs when the newer release bumps the {{NameNodeLayoutVersion}} during rolling upgrade.



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