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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7541) Upgrade Domains in HDFS
Date Tue, 02 May 2017 19:55:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15993607#comment-15993607
] 

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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