He Xiaoqiao commented on HDFS-8966:

[~wheat9],[~jingzhao] is this issue still ongoing?

> Separate the lock used in namespace and block management layer
> --------------------------------------------------------------
>                 Key: HDFS-8966
>                 URL: https://issues.apache.org/jira/browse/HDFS-8966
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Haohui Mai
>            Assignee: Haohui Mai
>            Priority: Major
> Currently the namespace and the block management layer share one giant lock. 
> One consequence that we have seen more and more often is that the namespace 
> hangs due to excessive activities from the block management layer. For 
> example, the NN might take a couple hundred milliseconds to handle a large 
> block report. Because the NN holds the write lock during processing the block 
> report, all namespace requests are paused. In production we have seen these 
> lock contentions cause long latencies and instabilities in the cluster.
> This umbrella jira proposes to separate the lock used by namespace and the 
> block management layer.

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