Jingcheng Du updated HADOOP-13702:
    Attachment: HADOOP-13702-V7.patch

Upload a new patch V7 to address the comments from [~xiaochen]. Thanks.
# Move InstrumentedLock and TestInstrumentedLock to COMMON. Please be noted, 
these classes are also in branch 2.8.0, and they are in HDFS there. 
# Use InstrumentedReadLock and InstrumentedWriteLock to extend 
InstrumentedLock, and remove the duplicated code.
Hi all, please take a look if this latest patch V7 is okay. Thanks.

> 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, HADOOP-13702-V7.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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