[jira] [Commented] (HDFS-9790) HDFS Balancer should exit with a proper message if upgrade is not finalized

["Arpit Agarwal (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-9790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15143714#comment-15143714 ] 

Arpit Agarwal commented on HDFS-9790:
-------------------------------------

Hi [~xiaobingo], thanks for fixing this.
# Error message should to to stderr.
# {{hdfs}} should be all capitals in the error message.

> HDFS Balancer should exit with a proper message if upgrade is not finalized
> ---------------------------------------------------------------------------
>
>                 Key: HDFS-9790
>                 URL: https://issues.apache.org/jira/browse/HDFS-9790
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Xiaobing Zhou
>            Assignee: Xiaobing Zhou
>         Attachments: HDFS-9790.001.patch
>
>
> PROBLEM: Currently if the upgrade is not finalized the balancer just exits as it cannot move any blocks as no deletes can go through the datanodes before a finalize. This is not clear to users.
> EXPECTED BEHAVIOR:
> Balancer should exit saying something like "Balancer exiting as upgrade is not finalized. Please finalize the hdfs upgrade before running the balancer"



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