Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/17591#discussion_r110692833
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileStatusCache.scala
---
@@ -94,27 +94,46 @@ private class SharedInMemoryCache(maxSizeInBytes: Long)
extends Logging {
// Opaque object that uniquely identifies a shared cache user
private type ClientId = Object
+
private val warnedAboutEviction = new AtomicBoolean(false)
// we use a composite cache key in order to distinguish entries inserted
by different clients
- private val cache: Cache[(ClientId, Path), Array[FileStatus]] =
CacheBuilder.newBuilder()
- .weigher(new Weigher[(ClientId, Path), Array[FileStatus]] {
- override def weigh(key: (ClientId, Path), value: Array[FileStatus]):
Int = {
- (SizeEstimator.estimate(key) + SizeEstimator.estimate(value)).toInt
- }})
- .removalListener(new RemovalListener[(ClientId, Path),
Array[FileStatus]]() {
- override def onRemoval(removed: RemovalNotification[(ClientId,
Path), Array[FileStatus]])
+ private val cache: Cache[(ClientId, Path), Array[FileStatus]] = {
+ /* [[Weigher]].weigh returns Int so we could only cache objects < 2GB
+ * instead, the weight is divided by this factor (which is smaller
+ * than the size of one [[FileStatus]]).
+ * so it will support objects up to 64GB in size.
+ */
+ val weightScale = 32
+ CacheBuilder.newBuilder()
+ .weigher(new Weigher[(ClientId, Path), Array[FileStatus]] {
+ override def weigh(key: (ClientId, Path), value:
Array[FileStatus]): Int = {
+ val estimate = (SizeEstimator.estimate(key) +
SizeEstimator.estimate(value)) / weightScale
+ if (estimate > Int.MaxValue) {
+ logWarning(s"Cached table partition metadata size is too big.
Approximating to " +
+ s"${Int.MaxValue.toLong * weightScale}.")
+ Int.MaxValue
+ } else {
+ estimate.toInt
+ }
+ }
+ })
+ .removalListener(new RemovalListener[(ClientId, Path),
Array[FileStatus]]() {
--- End diff --
This is kinda hard to read. Can we just initialize the weighter and the
listener in separate variables?
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