Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/11874#discussion_r57254309
--- Diff:
core/src/main/scala/org/apache/spark/memory/StorageMemoryPool.scala ---
@@ -56,12 +58,30 @@ private[memory] class StorageMemoryPool(lock: Object)
extends MemoryPool(lock) w
/**
* Acquire N bytes of memory to cache the given block, evicting existing
ones if necessary.
- *
+ *
* @return whether all N bytes were successfully granted.
*/
- def acquireMemory(blockId: BlockId, numBytes: Long): Boolean =
lock.synchronized {
- val numBytesToFree = math.max(0, numBytes - memoryFree)
- acquireMemory(blockId, numBytes, numBytesToFree)
+ def acquireMemory(blockId: BlockId, numBytes: Long): Boolean = {
+ // First, attempt to acquire as much memory as we can without
performing any eviction
+ val bytesAcquiredWithoutEviction = lock.synchronized {
+ val bytesAcquired = math.min(numBytes, memoryFree)
+ _memoryUsed += bytesAcquired
+ bytesAcquired
+ }
+ // Acquire the remainder of the memory by performing eviction
--- End diff --
can you add something like
```
// Here we want to evict as much space as we are requesting because we have
already
// acquired all available free space for this block.
```
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