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https://issues.apache.org/jira/browse/HDFS-7541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15333104#comment-15333104
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Ming Ma edited comment on HDFS-7541 at 6/16/16 5:13 AM:
--------------------------------------------------------
Thanks everyone for the input and contribution. Special thanks to [~eddyxu] for
the review and suggestion.
was (Author: mingma):
Thanks for the everyone's input and contribution!
> 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: 2.9.0
>
> Attachments: HDFS-7541-2.patch, HDFS-7541.patch,
> SupportforfastHDFSdatanoderollingupgrade.pdf, UpgradeDomains_Design_v3.pdf,
> UpgradeDomains_design_v2.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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