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https://issues.apache.org/jira/browse/AMBARI-10568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14499886#comment-14499886
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Andrii Babiichuk commented on AMBARI-10568:
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+1 for the patch
> Rolling Restart: batch size is fixed and cannot be changed
> ----------------------------------------------------------
>
> Key: AMBARI-10568
> URL: https://issues.apache.org/jira/browse/AMBARI-10568
> Project: Ambari
> Issue Type: Bug
> Components: ambari-web
> Affects Versions: 2.1.0
> Reporter: Aleksandr Kovalenko
> Assignee: Aleksandr Kovalenko
> Fix For: 2.1.0
>
> Attachments: AMBARI-10568.patch
>
>
> Let the user set the batch size for datanodes > # of slaves and don't show
> the warning. If they do, it just restarts all. Always recommend "1", and if
> greater than 1 is entered, show the new warning "Restarting more than one
> DataNode at a time is not recommended. Doing so can lead to data
> unavailability and/or possible loss of data being actively written to HFDS".
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