Chen Liang created HDFS-10682:
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Summary: Add metric to measure lock held time in FSDataSetImpl
Key: HDFS-10682
URL: https://issues.apache.org/jira/browse/HDFS-10682
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Chen Liang
Assignee: Chen Liang
Add a metric to measure the time the lock of FSDataSetImpl is held by a thread.
The goal is to expose this for users to identify operations that locks dataset
for long time ("long" in some sense) and be able to understand/reason/track the
operation based on logs.
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