1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
package spark.deploy.client
import spark.deploy._
import akka.actor._
import akka.pattern.ask
import akka.util.duration._
import akka.pattern.AskTimeoutException
import spark.{SparkException, Logging}
import akka.remote.RemoteClientLifeCycleEvent
import akka.remote.RemoteClientShutdown
import spark.deploy.RegisterApplication
import spark.deploy.master.Master
import akka.remote.RemoteClientDisconnected
import akka.actor.Terminated
import akka.dispatch.Await
/**
* The main class used to talk to a Spark deploy cluster. Takes a master URL, an app description,
* and a listener for cluster events, and calls back the listener when various events occur.
*/
private[spark] class Client(
actorSystem: ActorSystem,
masterUrl: String,
appDescription: ApplicationDescription,
listener: ClientListener)
extends Logging {
var actor: ActorRef = null
var appId: String = null
class ClientActor extends Actor with Logging {
var master: ActorRef = null
var masterAddress: Address = null
var alreadyDisconnected = false // To avoid calling listener.disconnected() multiple times
override def preStart() {
logInfo("Connecting to master " + masterUrl)
try {
master = context.actorFor(Master.toAkkaUrl(masterUrl))
masterAddress = master.path.address
master ! RegisterApplication(appDescription)
context.system.eventStream.subscribe(self, classOf[RemoteClientLifeCycleEvent])
context.watch(master) // Doesn't work with remote actors, but useful for testing
} catch {
case e: Exception =>
logError("Failed to connect to master", e)
markDisconnected()
context.stop(self)
}
}
override def receive = {
case RegisteredApplication(appId_) =>
appId = appId_
listener.connected(appId)
case ExecutorAdded(id: Int, workerId: String, host: String, cores: Int, memory: Int) =>
val fullId = appId + "/" + id
logInfo("Executor added: %s on %s (%s) with %d cores".format(fullId, workerId, host, cores))
listener.executorAdded(fullId, workerId, host, cores, memory)
case ExecutorUpdated(id, state, message, exitStatus) =>
val fullId = appId + "/" + id
val messageText = message.map(s => " (" + s + ")").getOrElse("")
logInfo("Executor updated: %s is now %s%s".format(fullId, state, messageText))
if (ExecutorState.isFinished(state)) {
listener.executorRemoved(fullId, message.getOrElse(""), exitStatus)
}
case Terminated(actor_) if actor_ == master =>
logError("Connection to master failed; stopping client")
markDisconnected()
context.stop(self)
case RemoteClientDisconnected(transport, address) if address == masterAddress =>
logError("Connection to master failed; stopping client")
markDisconnected()
context.stop(self)
case RemoteClientShutdown(transport, address) if address == masterAddress =>
logError("Connection to master failed; stopping client")
markDisconnected()
context.stop(self)
case StopClient =>
markDisconnected()
sender ! true
context.stop(self)
}
/**
* Notify the listener that we disconnected, if we hadn't already done so before.
*/
def markDisconnected() {
if (!alreadyDisconnected) {
listener.disconnected()
alreadyDisconnected = true
}
}
}
def start() {
// Just launch an actor; it will call back into the listener.
actor = actorSystem.actorOf(Props(new ClientActor))
}
def stop() {
if (actor != null) {
try {
val timeout = 5.seconds
val future = actor.ask(StopClient)(timeout)
Await.result(future, timeout)
} catch {
case e: AskTimeoutException => // Ignore it, maybe master went away
}
actor = null
}
}
}
|
