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Posted to hdfs-issues@hadoop.apache.org by "Akira Ajisaka (JIRA)" <ji...@apache.org> on 2018/01/25 06:35:00 UTC
[jira] [Commented] (HDFS-13063) Fix the incorrect spelling in
HDFSHighAvailabilityWithQJM.md
[ https://issues.apache.org/jira/browse/HDFS-13063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16338806#comment-16338806 ]
Akira Ajisaka commented on HDFS-13063:
--------------------------------------
Sorry I missed the result of Jenkins precommit job. This issue is to fix a typo in the document, so the precommit job will +1.
> Fix the incorrect spelling in HDFSHighAvailabilityWithQJM.md
> ------------------------------------------------------------
>
> Key: HDFS-13063
> URL: https://issues.apache.org/jira/browse/HDFS-13063
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: documentation
> Affects Versions: 3.0.0
> Reporter: Jianfei Jiang
> Assignee: Jianfei Jiang
> Priority: Trivial
> Fix For: 3.1.0, 2.10.0, 2.9.1, 3.0.1
>
> Attachments: HDFS-13063.001.patch
>
>
> The word JournalNode in this markdown file is incorrect spelled.
> In order for the Standby node to keep its state synchronized with the Active node, both nodes communicate with a group of separate daemons called "JournalNodes" (JNs). When any namespace modification is performed by the Active node, it durably logs a record of the modification to a majority of these JNs. The Standby node is capable of reading the edits from the JNs, and is constantly watching them for changes to the edit log. As the Standby Node sees the edits, it applies them to its own namespace. In the event of a failover, the Standby will ensure that it has read all of the edits from the {color:#333333}*JounalNodes*{color} before promoting itself to the Active state. This ensures that the namespace state is fully synchronized before a failover occurs.
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