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From "xiangheng (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Deleted] (HDFS-12943) Consistent Reads from Standby Node
Date Fri, 16 Nov 2018 06:04:01 GMT

     [ https://issues.apache.org/jira/browse/HDFS-12943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

xiangheng updated HDFS-12943:
-----------------------------
    Comment: was deleted

(was: Hi,[~csun],I am very glad to communicate this question with you.i have checked the HDFS-14067,
It seems that this problem has not been solved,If you agree with it,i will propose a new

subtask and devote myself to solve this problem.please let me know if you have any good suggestions,thank
you very much.)

> 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
>            Priority: Major
>         Attachments: ConsistentReadsFromStandbyNode.pdf, ConsistentReadsFromStandbyNode.pdf,
TestPlan-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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