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https://issues.apache.org/jira/browse/HDFS-15242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17073262#comment-17073262
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Hudson commented on HDFS-15242:
-------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #18109 (See 
[https://builds.apache.org/job/Hadoop-trunk-Commit/18109/])
HDFS-15242. Add metrics for operations hold lock times of FsDatasetImpl. 
(weichiu: rev d3b595157256e198c4340d555e14ad6144f2eaa1)
* (edit) 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
* (edit) 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/metrics/DataNodeMetrics.java
* (edit) 
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeMetrics.java
* (edit) hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md


> 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
>             Fix For: 3.4.0
>
>         Attachments: HDFS-15242.001.patch, HDFS-15242.002.patch, 
> HDFS-15242.003.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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