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https://issues.apache.org/jira/browse/YARN-8763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16642268#comment-16642268
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Hudson commented on YARN-8763:
------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #15141 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/15141/])
YARN-8763. Added node manager websocket API for accessing containers.
(eyang: rev 347ea385817766a5c418017009728cd8b9959776)
* (add)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/webapp/ContainerShellWebSocket.java
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/TestLinuxContainerExecutor.java
* (add)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/webapp/TestNMContainerWebSocket.java
* (edit) hadoop-client-modules/hadoop-client-runtime/pom.xml
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/DefaultContainerExecutor.java
* (add)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/webapp/ContainerShellWebSocketServlet.java
* (edit) hadoop-project/pom.xml
* (edit) hadoop-client-modules/hadoop-client-minicluster/pom.xml
* (add)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/webapp/ContainerShellClientSocketTest.java
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/TestContainerExecutor.java
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/pom.xml
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/webapp/WebServer.java
* (add)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/executor/ContainerExecContext.java
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/ContainerExecutor.java
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/monitor/TestContainersMonitorResourceChange.java
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/LinuxContainerExecutor.java
> Add WebSocket logic to the Node Manager web server to establish servlet
> -----------------------------------------------------------------------
>
> Key: YARN-8763
> URL: https://issues.apache.org/jira/browse/YARN-8763
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Zian Chen
> Assignee: Zian Chen
> Priority: Major
> Labels: Docker
> Fix For: 3.3.0
>
> Attachments: YARN-8763-001.patch, YARN-8763.002.patch,
> YARN-8763.003.patch, YARN-8763.004.patch, YARN-8763.005.patch
>
>
> The reason we want to use WebSocket servlet to serve the backend instead of
> establishing the connection through HTTP is that WebSocket solves a few
> issues with HTTP which needed for our scenario,
> # In HTTP, the request is always initiated by the client and the response is
> processed by the server — making HTTP a unidirectional protocol, while web
> socket provides the Bi-directional protocol which means either client/server
> can send a message to the other party.
> # Full-duplex communication — client and server can talk to each other
> independently at the same time
> # Single TCP connection — After upgrading the HTTP connection in the
> beginning, client and server communicate over that same TCP connection
> throughout the lifecycle of WebSocket connection
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