Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/42#discussion_r10597228
--- Diff: core/src/main/scala/org/apache/spark/ui/SparkUI.scala ---
@@ -68,19 +105,53 @@ private[spark] class SparkUI(sc: SparkContext) extends
Logging {
/** Initialize all components of the server */
def start() {
- // NOTE: This is decoupled from bind() because of the following
dependency cycle:
- // DAGScheduler() requires that the port of this server is known
- // This server must register all handlers, including JobProgressUI,
before binding
- // JobProgressUI registers a listener with SparkContext, which
requires sc to initialize
+ storage.start()
jobs.start()
+ env.start()
exec.start()
+
+ // Listen for events from the SparkContext if it exists, otherwise
from persisted storage
+ val eventBus = if (live) {
+ val loggingEnabled = conf.getBoolean("spark.eventLog.enabled", false)
+ if (loggingEnabled) {
+ val logger = new EventLoggingListener(appName, conf)
+ eventLogger = Some(logger)
+ sc.listenerBus.addListener(logger)
+ }
+ sc.listenerBus
+ } else {
+ replayerBus = Some(new SparkReplayerBus(conf))
+ replayerBus.get
+ }
+
+ // Storage status listener must receive events first, as other
listeners depend on its state
+ eventBus.addListener(storageStatusListener)
+ eventBus.addListener(storage.listener)
+ eventBus.addListener(jobs.listener)
+ eventBus.addListener(env.listener)
+ eventBus.addListener(exec.listener)
+ started = true
+ }
+
+ /**
+ * Reconstruct a previously persisted SparkUI from logs residing in the
given directory.
+ *
+ * This method must be invoked after the SparkUI has started. Return
true if log files
+ * are found and processed.
+ */
+ def renderFromPersistedStorage(logDir: String): Boolean = {
--- End diff --
This also might be nice to take out of the SparkUI and make a utility
function associated with a ReplayBus. For instance the ReplayBus could have an
associated object and that has a utility function like:
```
object ReplayBus {
def replayFromPersistentStorage(logDir: String, bus: ReplayBus)
}
```
The concept of replay is sort of distinct from the UI and might be useful
for other listener implementations.
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