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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7541) Upgrade Domains in HDFS
Date Mon, 01 May 2017 21:12:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15991533#comment-15991533

Kihwal Lee commented on HDFS-7541:

Just found out I somehow clicked the evil "Assign to me" link 6 days ago. I didn't mean to
do that.

[~mingma], fork & exec with a large NN is not desirable for us and using the new host
file format doesn't seem attractive since a lot of automation is built around the old format.
 We could probably add something similar to the network topology java plugin.

I think 2.8.1 is for immediate stabilization and fixes after 2.8.0, so 2.8.2 will be a more
reasonable target.

> 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, 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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