liying created HDFS-17256:
-----------------------------

             Summary: add the individual namespaces isolation mode for router 
to avoid affecting other namespaces
                 Key: HDFS-17256
                 URL: https://issues.apache.org/jira/browse/HDFS-17256
             Project: Hadoop HDFS
          Issue Type: New Feature
          Components: rbf
    Affects Versions: 3.2.1
         Environment: In general, we do not need to set isolation limits for 
all namespaces in cluster. For example, we only need to set the isolation 
limits for the problem namespaces to avoid affecting other namespaces when some 
namespaces occur errors. If we set isolation limits for all namespaces in 
cluster,  it brings many risks by itself as it is very difficult to confirm the 
specific parameters.  Instead,The result is increasing request latency for 
other namespaces. Let's talk about a specific scenario: 

when ns1 service is unavailable as some bugs,we turn on isolation-related 
switches dynamically to support the abnormal ns isolation in router , and set 
the handler number  of abnormal ns as low as possible to avoid affecting other 
namespaces.
            Reporter: liying






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