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https://issues.apache.org/jira/browse/HDFS-12943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16964579#comment-16964579
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Hudson commented on HDFS-12943:
-------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #17592 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/17592/])
Add 2.10.0 release notes for HDFS-12943 (jhung: rev
ef9d12df24c0db76fd37a95551db7920d27d740c)
* (edit)
hadoop-common-project/hadoop-common/src/site/markdown/release/2.10.0/RELEASENOTES.2.10.0.md
> 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
> Assignee: Konstantin Shvachko
> Priority: Major
> Fix For: 2.10.0, 3.3.0, 3.1.4, 3.2.2
>
> Attachments: ConsistentReadsFromStandbyNode.pdf,
> ConsistentReadsFromStandbyNode.pdf, HDFS-12943-001.patch,
> HDFS-12943-002.patch, HDFS-12943-003.patch, HDFS-12943-004.patch,
> 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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