Yiqun Lin commented on HDFS-12268:

The failure tests are related. I missed initialize the array 
{{pendingOpsLatency}} in class {{XceiverClientMetrics}}.
Attach the updated patch. Also added unit test for {{XceiverClientMetrics}}. We 
can see the pending metrics are working as we expected.

> Ozone: Add metrics for pending storage container requests
> ---------------------------------------------------------
>                 Key: HDFS-12268
>                 URL: https://issues.apache.org/jira/browse/HDFS-12268
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>    Affects Versions: HDFS-7240
>            Reporter: Yiqun Lin
>            Assignee: Yiqun Lin
>         Attachments: HDFS-12268-HDFS-7240.001.patch, 
> HDFS-12268-HDFS-7240.002.patch
>  As storage container async interface has been supported after HDFS-11580, we 
> need to keep an eye on the queue depth of pending container requests. It can 
> help us better found if there are some performance problems.

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