Package com.spotify.helios.agent

Interface Summary

Interface	Description
AgentModel	Models the desired state of a host as provided by masters and provides a way for an agent to indicate its current state.
AgentModel.Listener	A listener for changes to the set of tasks.
ContainerDecorator	An interface to allow you to change the HostConfig and ContainerConfig objects before they are sent to Docker.
HealthChecker
RetryIntervalPolicy	Provides retry schedulers.
RetryScheduler
Sleeper	Mostly for testing.
StatusUpdater	An interface used to abstract how task statuses are reported.
Supervisor.Listener

Class Summary

Class	Description
AddExtraHostContainerDecorator	ContainerDecorator that adds to HostConfig.extraHosts().
Agent	Runs jobs to implement the desired container deployment state.
AgentConfig	The configuration of the Helios agent.
AgentInfoReporter	Report various Agent runtime information via ZK so it can be visible to clients of Helios.
AgentMain	Instantiates and runs helios agent.
AgentModelTaskResource	Makes it so you can view the tasks as the Agent sees things.
AgentModelTaskStatusResource	Makes it so you can view the status of tasks as the Agent sees things.
AgentParser	Parses and processes command-line arguments to produce the AgentConfig.
AgentService	The Helios agent.
AgentZooKeeperRegistrar	Persistently tries to register with ZK in the face of a ZK outage.
BindVolumeContainerDecorator	Bind mounts user-specified volumes into all containers.
BoundedRandomExponentialBackoff	A retry policy that provides exponential backoff with randomization.
BoundedRandomExponentialBackoff.Builder
DefaultStatusUpdater	Plain boring status updater for tasks to report their status to the AgentModel.
DockerHealthChecker	Health checker exposed by /healthcheck on the admin port (5804 by default).
EnvironmentVariableReporter	Puts the environment variables the Agent has been configured to set in all child containers into ZK so they can be visible to the master and via the API.
Execution
FlapController	Tracks container starts and exits and determines if the task is "flapping", which is to say: it's exiting rapidly and repeatedly.
FlapController.Builder
HealthCheckerFactory
HostInfoReporter	Reports various bits of system information to ZK so it can be viewed via the the API.
InterruptingScheduledService	Runs InterruptingScheduledService.runOneIteration() on a ScheduledExecutorService (see InterruptingScheduledService.schedule(java.lang.Runnable, java.util.concurrent.ScheduledExecutorService)) to do periodic operations.
LabelReporter	Puts the labels the agent has been assigned into ZK so they can be visible to the master and via the API.
NoOpContainerDecorator	A ContainerDecorator that does, as its name would imply, nothing.
PollingDockerClient	A DockerClient that overrides PollingDockerClient.waitContainer(java.lang.String) to poll instead of block indefinitely.
PortAllocator	A simple port allocator.
Reaper	Find containers running in our namespace for which we don't have a record that we started, and kill them.
RestartPolicy	Return the proper docker container restart delay based upon the throttle state of the task.
RestartPolicy.Builder
Result<V>	Helper for getting the result of a ListenableFuture.
SignalAwaitingService	An InterruptingScheduledService which awaits on a CountDownLatch prior to InterruptingScheduledService.runOneIteration().
Supervisor	Supervises docker containers for a single job.
Supervisor.Builder
SupervisorFactory	Creates job supervisors.
SyslogRedirectingContainerDecorator	Bind mounts /usr/lib/helios inside the container as /helios, and uses the syslog-redirector executable there to redirect container stdout/err to syslog.
TaskConfig	Provides docker container configuration for running a task.
TaskConfig.Builder
TaskHistoryWriter	Writes task history to ZK, and attempts to gracefully handle the case where ZK is down, and tries to lose the right things if it has to lose stuff.
TaskMonitor	A monitor for TaskRunner, processing events into observations about the health of a task, e.g.
TaskRunnerFactory	As you might guess, creates TaskRunners.
TaskRunnerFactory.Builder
ThreadSleeper	An implementation of Sleeper that calls Thread.sleep().
ZooKeeperAgentModel	The Helios Agent's view into ZooKeeper.