org.apache.samza.webapp

Class YarnContainerHeartbeatServlet

java.lang.Object

javax.servlet.GenericServlet

javax.servlet.http.HttpServlet

org.apache.samza.webapp.YarnContainerHeartbeatServlet

All Implemented Interfaces:

java.io.Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

public class YarnContainerHeartbeatServlet
extends javax.servlet.http.HttpServlet

Responds to heartbeat requests from the containers with a ContainerHeartbeatResponse. The heartbeat request contains the executionContainerId which in YARN's case is the YARN container Id. This servlet validates the container Id against the list of running containers maintained in the YarnAppState. The returned ContainerHeartbeatResponse.isAlive() is true iff. the container Id exists in YarnAppState.runningYarnContainers.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
YarnContainerHeartbeatServlet(YarnAppState yarnAppState, org.apache.samza.metrics.ReadableMetricsRegistry registry)

Method Summary

Modifier and Type	Method and Description
protected void	doGet(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse resp)

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPost, doPut, doTrace, getLastModified, service, service

Methods inherited from class javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, init, log, log

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

YarnContainerHeartbeatServlet

public YarnContainerHeartbeatServlet(YarnAppState yarnAppState,
                                     org.apache.samza.metrics.ReadableMetricsRegistry registry)

Method Detail

doGet

protected void doGet(javax.servlet.http.HttpServletRequest req,
                     javax.servlet.http.HttpServletResponse resp)
              throws javax.servlet.ServletException,
                     java.io.IOException

Overrides:

doGet in class javax.servlet.http.HttpServlet

Throws:

javax.servlet.ServletException

java.io.IOException