Jingcheng Du commented on HADOOP-13702:

Thanks [~xiaochen]! I have some misunderstanding on the returned type of 
{{readLock}} and {{writeLock}} in {{ReadWriteLock}}, let me post another patch 
to fix this:) 

> Add a new instrumented read-write lock
> --------------------------------------
>                 Key: HADOOP-13702
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13702
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: common
>            Reporter: Jingcheng Du
>            Assignee: Jingcheng Du
>         Attachments: HADOOP-13702-V6.patch, HDFS-10924-2.patch, 
> HDFS-10924-3.patch, HDFS-10924-4.patch, HDFS-10924-5.patch, HDFS-10924.patch
> 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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