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https://issues.apache.org/jira/browse/HBASE-24395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17204998#comment-17204998
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Michael Stack commented on HBASE-24395:
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[~Bo Cui] what you think of the suggestion by [~pankajkumar] that "You can
backport HBASE-20589 changes." <= Seems good to me.
> ServerName#getHostname() is case sensitive
> ------------------------------------------
>
> Key: HBASE-24395
> URL: https://issues.apache.org/jira/browse/HBASE-24395
> Project: HBase
> Issue Type: Sub-task
> Components: Balancer
> Affects Versions: 1.3.1
> Reporter: Bo Cui
> Priority: Major
> Attachments: HBase-24395.patch, image-2020-05-18-17-42-57-119.png
>
>
> ServerName calss，the getServerName(String hostName, int port, long
> startcode),equals and compareTo are case insensitive, but getHostname() is
> case sensitive.
> if hostName is HOSTNAME1, ServerName is hostname1,11111,1589615319931, and
> getHostname() returns HOSTNAME1.
> and then BaseLoadBalancer#retainAssignment() uses ServerName#getHostname(),
> all keys of serversByHostname are
> upperCase(HOSTNAME1,HOSTNAME2,HOSTNAME3,HOSTNAME4...) from
> ServerManager#createDestinationServersList, but oldServerName.getHostname()
> is lowerCase(hostname1,hostname2,hostname3...) from walLog dir.
> !image-2020-05-18-17-42-57-119.png!
> and finally...all region of old ServerName will be assigned to random hosts
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