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https://issues.apache.org/jira/browse/HDFS-17327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17803838#comment-17803838
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ASF GitHub Bot commented on HDFS-17327:
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huangzhaobo99 opened a new pull request, #6421:
URL: https://github.com/apache/hadoop/pull/6421
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### Description of PR
JIRA: https://issues.apache.org/jira/browse/HDFS-17327
1. If it is a null value, after reconfig, it will take effect as the current
system value and not necessarily the default value.
2. `ReconfigurableBase#reconfigureProperty` judges the condition
incorrectly, When the effectValue is not null, the system value needs to be
changed.
### How was this patch tested?
Add Unit Test
> Fix reconfig disk balancer parameters for datanode.
> ---------------------------------------------------
>
> Key: HDFS-17327
> URL: https://issues.apache.org/jira/browse/HDFS-17327
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: huangzhaobo
> Assignee: huangzhaobo
> Priority: Blocker
>
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