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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7541) Upgrade Domains in HDFS
Date Mon, 01 May 2017 03:38:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15990559#comment-15990559

Ming Ma commented on HDFS-7541:

Sure I can backport HDFS-9005, HDFS-9016 and HDFS-9922 to 2.8. Which 2.8 release do we want,
2.8.1 or 2.8.2? Pushing the feature to 2.7 requires much more work though. Regarding the production
quality, yes it has been pretty reliable. The only feature we don't use in our production
is HDFS-9005. We used script-based configuration approach while the feature was developed
and tested and haven't spend time changing the configuration mechanism. 

> 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: Kihwal Lee
>             Fix For: 2.9.0, 3.0.0-alpha1
>         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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