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https://issues.apache.org/jira/browse/HDFS-7541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15993607#comment-15993607
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Ming Ma commented on HDFS-7541:
-------------------------------
Sounds good. HDFS-9005, HDFS-9016 and HDFS-9922 have been committed to 2.8.2.
> Upgrade Domains in HDFS
> -----------------------
>
> Key: HDFS-7541
> URL: https://issues.apache.org/jira/browse/HDFS-7541
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Ming Ma
> Assignee: Ming Ma
> Fix For: 3.0.0-alpha1, 2.8.2
>
> Attachments: HDFS-7541-2.patch, HDFS-7541.patch,
> SupportforfastHDFSdatanoderollingupgrade.pdf, UpgradeDomains_design_v2.pdf,
> UpgradeDomains_Design_v3.pdf
>
>
> Current HDFS DN rolling upgrade step requires sequential DN restart to
> minimize the impact on data availability and read/write operations. The side
> effect is longer upgrade duration for large clusters. This might be
> acceptable for DN JVM quick restart to update hadoop code/configuration.
> However, for OS upgrade that requires machine reboot, the overall upgrade
> duration will be too long if we continue to do sequential DN rolling restart.
>
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