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https://issues.apache.org/jira/browse/HDFS-15242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17066919#comment-17066919
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Wei-Chiu Chuang commented on HDFS-15242:
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[~inigoiri] bless the +1 on the former version of the patch (HDFS-15075).

> Add metrics for operations hold lock times of FsDatasetImpl
> -----------------------------------------------------------
>
>                 Key: HDFS-15242
>                 URL: https://issues.apache.org/jira/browse/HDFS-15242
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Xiaoqiao He
>            Assignee: Xiaoqiao He
>            Priority: Major
>         Attachments: HDFS-15242.001.patch
>
>
> Some operations of FsDatasetImpl need to hold Lock, and sometimes it costs 
> long time to execute since it include IO operation in Lock. I propose to add 
> metrics for this operations then it could be more convenient for monitor and 
> dig bottleneck.



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