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@@ -89,8 +89,20 @@ Important features and improvements are as follows:
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[HDFS-15294](https://issues.apache.org/jira/browse/HDFS-15294) HDFS Federation balance tool introduces one tool to balance data across different namespace.
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+[HDFS-13522](https://issues.apache.org/jira/browse/HDFS-13522), [HDFS-16767](https://issues.apache.org/jira/browse/HDFS-16767) Support observer node from Router-Based Federation.
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+
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**Improvement**
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+[HADOOP-13144](https://issues.apache.org/jira/browse/HADOOP-13144), [HDFS-13274](https://issues.apache.org/jira/browse/HDFS-13274), [HDFS-15757](https://issues.apache.org/jira/browse/HDFS-15757)
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+
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+These tickets have enhanced IPC throughput between Router and NameNode via multiple connections per user, and optimized connection management.
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+
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+[HDFS-14090](https://issues.apache.org/jira/browse/HDFS-14090) RBF: Improved isolation for downstream name nodes. {Static}
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+
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+Router supports assignment of the dedicated number of RPC handlers to achieve isolation for all downstream nameservices
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+it is configured to proxy. Since large or busy clusters may have relatively higher RPC traffic to the namenode compared to other clusters namenodes,
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+this feature if enabled allows admins to configure higher number of RPC handlers for busy clusters.
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+
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[HDFS-17128](https://issues.apache.org/jira/browse/HDFS-17128) RBF: SQLDelegationTokenSecretManager should use version of tokens updated by other routers.
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The SQLDelegationTokenSecretManager enhances performance by maintaining processed tokens in memory. However, there is
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Takanobu Asanuma