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Add 2.10.0 release notes for HDFS-12943 

(cherry picked from commit ef9d12df24)
(cherry picked from commit 9ccfc2d6d3)
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Jonathan Hung 2019-10-31 20:33:59 -07:00
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hadoop-common-project/hadoop-common/src/site/markdown/release/2.10.0/RELEASENOTES.2.10.0.md
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@ -30,6 +30,19 @@ The generic resource types feature allows admins to configure custom resource ty
This also adds GPU as a native resource type, built on top of the generic resource types feature. It adds support for GPU resource discovery, GPU scheduling and GPU isolation.
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* [HDFS-12943](https://issues.apache.org/jira/browse/HDFS-12943) | *Major* | **Consistent Reads from Standby Node**
Observer is a new type of a NameNode in addition to Active and Standby Nodes in HA settings. An Observer Node maintains a replica of the namespace same as a Standby Node. It additionally allows execution of clients read requests.
To ensure read-after-write consistency within a single client, a state ID is introduced in RPC headers. The Observer responds to the client request only after its own state has caught up with the client’s state ID, which it previously received from the Active NameNode.
Clients can explicitly invoke a new client protocol call msync(), which ensures that subsequent reads by this client from an Observer are consistent.
A new client-side ObserverReadProxyProvider is introduced to provide automatic switching between Active and Observer NameNodes for submitting respectively write and read requests.
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* [HDFS-13541](https://issues.apache.org/jira/browse/HDFS-13541) | *Major* | **NameNode Port based selective encryption**