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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13702) Add a new instrumented read-write lock
Date Mon, 10 Oct 2016 18:46:21 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15563114#comment-15563114
] 

Xiao Chen commented on HADOOP-13702:
------------------------------------

bq. This follows guidance for System.nanoTime.
Thanks [~chris.douglas] for the good catch!

Also, seems the fix is moved back to HDFS, we should make sure the component is consistent
with the final change before check-in.
[~jingcheng.du@intel.com] thanks for revving. Why the new {{InstrumentedReadLock}} and {{InstrumentedWriteLock}}
can't reuse {{InstrumentedLock}}?

> 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: 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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