[hadoop] branch trunk updated: Add 2.10.0 release notes for HDFS-12943

[jh...@apache.org]

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jhung pushed a commit to branch trunk
in repository https://gitbox.apache.org/repos/asf/hadoop.git


The following commit(s) were added to refs/heads/trunk by this push:
     new ef9d12d  Add 2.10.0 release notes for HDFS-12943
ef9d12d is described below

commit ef9d12df24c0db76fd37a95551db7920d27d740c
Author: Jonathan Hung <jh...@linkedin.com>
AuthorDate: Thu Oct 31 20:33:59 2019 -0700

    Add 2.10.0 release notes for HDFS-12943
---
 .../src/site/markdown/release/2.10.0/RELEASENOTES.2.10.0.md | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/hadoop-common-project/hadoop-common/src/site/markdown/release/2.10.0/RELEASENOTES.2.10.0.md b/hadoop-common-project/hadoop-common/src/site/markdown/release/2.10.0/RELEASENOTES.2.10.0.md
index 199483f..ebea56b 100644
--- a/hadoop-common-project/hadoop-common/src/site/markdown/release/2.10.0/RELEASENOTES.2.10.0.md
+++ b/hadoop-common-project/hadoop-common/src/site/markdown/release/2.10.0/RELEASENOTES.2.10.0.md
@@ -32,6 +32,19 @@ This also adds GPU as a native resource type, built on top of the generic resour
 
 ---
 
+* [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.
+
+
+---
+
 * [HDFS-13541](https://issues.apache.org/jira/browse/HDFS-13541) | *Major* | **NameNode Port based selective encryption**
 
 This feature allows HDFS to selectively enforce encryption for both RPC (NameNode) and data transfer (DataNode). With this feature enabled, NameNode can listen on multiple ports, and different ports can have different security configurations. Depending on which NameNode port clients connect to, the RPC calls and the following data transfer will enforce security configuration corresponding to this NameNode port. This can help when there is requirement to enforce different security policie [...]


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