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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7230) Support rolling downgrade
Date Wed, 29 Oct 2014 01:30:34 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7230?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsz Wo Nicholas Sze updated HDFS-7230:
--------------------------------------
    Attachment: h7230_20141028.patch

h7230_20141028.patch: adds rolling downgrade documentation; no code change.

> Support rolling downgrade
> -------------------------
>
>                 Key: HDFS-7230
>                 URL: https://issues.apache.org/jira/browse/HDFS-7230
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>         Attachments: h7230_20141028.patch
>
>
> HDFS-5535 made a lot of improvement on rolling upgrade.  It also added the cluster downgrade
feature.  However, the downgrade described in HDFS-5535 requires cluster downtime.  In this
JIRA, we discuss how to do rolling downgrade, i.e. downgrade without downtime.



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