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https://issues.apache.org/jira/browse/HDFS-9804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15159285#comment-15159285
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Zhe Zhang commented on HDFS-9804:
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Thanks Xiao for the fix. The patch looks to me almost ready to go. A few minors:
# It's better to add some error handling in {{checkKerberosAndInit}}: what if
{{DFS_BALANCER_KERBEROS_PRINCIPAL_KEY}} or the keytab file key is not set.
# Looks like {{getAddress}} can be folded into the {{checkKerberosAndInit}}
method?
# Maybe {{checkKeytabAndInit}} is a better name?
# {{assertTrue(ugi.isLoginKeytabBased())}} should be
{{UserGroupInformation.isLoginKeytabBased()}} since the method is static
# This can be a follow-on: ideally we can verify the behavior when used with
the {{hdfs --daemon}} option.
# Another follow-on idea is to verify the relogin after TGT "max renew time"
expires. It could be hard to control KDC TGT config though.
> Allow long-running Balancer in Kerberized Environments
> ------------------------------------------------------
>
> Key: HDFS-9804
> URL: https://issues.apache.org/jira/browse/HDFS-9804
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Xiao Chen
> Assignee: Xiao Chen
> Labels: supportability
> Attachments: HDFS-9804.01.patch, HDFS-9804.02.patch
>
>
> From the discussion of HDFS-9698, it might be nice to allow the balancer to
> run as a daemon and login from a keytab.
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