Yiqun Lin updated HDFS-12268:
    Attachment: HDFS-12268-HDFS-7240.002.patch

Thanks [~anu] for the review!
bq. Do you think we can maintain average time per op. So we can print out the 
performance from the client point of view?
I like this idea, :). The new patch will addresses this.
bq. There is also an added detail that from the ozone-client perspective we 
create one XcieverClient per pipeline( a set of datanodes). So when we close 
the XcieverClient, we should probably collect this info.
I;m a little confused on this comment. What's the meaning of {{this info}} here?
Attach the updated patch.

> 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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