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
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