huangzhaobo99 opened a new pull request, #6505:
URL: https://github.com/apache/hadoop/pull/6505
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### Description of PR
JIAR: https://issues.apache.org/jira/browse/HDFS-17360
1. In prod env, it is common for high concurrency to read a certain block,
leading to an increase in machine load, And then affect other users.
2. Now, record the number of requests for blockId during a specific time
period on the jmx page, and promptly locate abnormal users or blocks.
3. And combined with the `fsck` tool to obtain specific paths.
### How was this patch tested?
Add `TestDataNodeMetrics#testReadBlockIdCounts` UT.
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