huangzhaobo99 opened a new pull request, #6338:
URL: https://github.com/apache/hadoop/pull/6338
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### Description of PR
1. The threshold related to SlowNodes is
https://issues.apache.org/jira/browse/hdfs-16396 dynamic reconfig is supported
in, SlowLogThreshold also needs to support reconfig to easily dynamic
adjustment of log output on DN.
2. The cost of rolling up DN increases and requires a longer time.
### How was this patch tested?
Add Unit Test.
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