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Posted to hdfs-issues@hadoop.apache.org by "Virajith Jalaparti (JIRA)" <ji...@apache.org> on 2018/01/02 20:19:00 UTC

[jira] [Commented] (HDFS-12943) Consistent Reads from Standby Node

    [ https://issues.apache.org/jira/browse/HDFS-12943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16308647#comment-16308647 ] 

Virajith Jalaparti commented on HDFS-12943:
-------------------------------------------

Thanks for the clarification [~shv]

> Consistent Reads from Standby Node
> ----------------------------------
>
>                 Key: HDFS-12943
>                 URL: https://issues.apache.org/jira/browse/HDFS-12943
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: hdfs
>            Reporter: Konstantin Shvachko
>         Attachments: ConsistentReadsFromStandbyNode.pdf
>
>
> StandbyNode in HDFS is a replica of the active NameNode. The states of the NameNodes are coordinated via the journal. It is natural to consider StandbyNode as a read-only replica. As with any replicated distributed system the problem of stale reads should be resolved. Our main goal is to provide reads from standby in a consistent way in order to enable a wide range of existing applications running on top of HDFS.



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