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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HDFS-7541) Upgrade Domains in HDFS
Date Thu, 16 Jun 2016 05:13:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15333104#comment-15333104
] 

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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