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https://issues.apache.org/jira/browse/HDFS-5535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13913959#comment-13913959
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Jing Zhao commented on HDFS-5535:
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Filed HDFS-6026 to fix TestDataNodeRollingUpgrade and TestDFSUpgrade.
TestSafeMode and TestPread seem to be some flaky unit tests and should be
unrelated. TestOfflineEditsViewer needs the binary update.
> Umbrella jira for improved HDFS rolling upgrades
> ------------------------------------------------
>
> Key: HDFS-5535
> URL: https://issues.apache.org/jira/browse/HDFS-5535
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: datanode, ha, hdfs-client, namenode
> Affects Versions: 3.0.0, 2.2.0
> Reporter: Nathan Roberts
> Attachments: HDFSRollingUpgradesHighLevelDesign.pdf,
> h5535_20140219.patch, h5535_20140220-1554.patch, h5535_20140220b.patch,
> h5535_20140221-2031.patch, h5535_20140224-1931.patch,
> h5535_20140225-1225.patch, h5535_20140226-1328.patch, hdfs-5535-test-plan.pdf
>
>
> In order to roll a new HDFS release through a large cluster quickly and
> safely, a few enhancements are needed in HDFS. An initial High level design
> document will be attached to this jira, and sub-jiras will itemize the
> individual tasks.
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