Jingcheng Du created HDFS-10924:
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Summary: Add a new instrumented read-write lock
Key: HDFS-10924
URL: https://issues.apache.org/jira/browse/HDFS-10924
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Jingcheng Du
Add a new instrumented read-write lock in hadoop common, so that the HDFS-9668
can use this to improve the locking in FsDatasetImpl
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