mridulm commented on code in PR #41105:
URL: https://github.com/apache/spark/pull/41105#discussion_r1194654288
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core/src/main/scala/org/apache/spark/deploy/history/ApplicationCache.scala:
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@@ -48,11 +48,28 @@ private[history] class ApplicationCache(
val retainedApplications: Int,
val clock: Clock) extends Logging {
+ /**
+ * Keep track of SparkUIs in [[ApplicationCache#appCache]] and SparkUIs
removed from
+ * [[ApplicationCache#appCache]] but not detached yet.
+ */
+ private val loadedApps = new ConcurrentHashMap[CacheKey, CountDownLatch]()
+
private val appLoader = new CacheLoader[CacheKey, CacheEntry] {
/** the cache key doesn't match a cached entry, or the entry is
out-of-date, so load it. */
override def load(key: CacheKey): CacheEntry = {
- loadApplicationEntry(key.appId, key.attemptId)
+ // Ensure old SparkUI has been detached before loading new one.
+ val removalLatch = loadedApps.get(key)
+ if (removalLatch != null) {
+ // Old SparkUI is in the middle of detaching.
+ // Waiting 10 seconds should be enough since detaching usually takes
less than 1 second.
+ if (!removalLatch.await(10, TimeUnit.SECONDS)) {
Review Comment:
To clarify, `load` is now going to wait for the `onRemoval` to complete -
and going down `detachSparkUI` call tree, there are `synchronized` blocks in
some of the subtrees.
I am unsure how contended these might be, what the potential time taken are
... and this was the context of my query around whether 10s is sufficient/too
little/too high ?
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