ODIn/spark-instrumented-optimizer
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

[SPARK-8309] [CORE] Support for more than 12M items in OpenHashMap

Browse source 
The problem occurs because the position mask `0xEFFFFFF` is incorrect. It has zero 25th bit, so when capacity grows beyond 2^24, `OpenHashMap` calculates incorrect index of value in `_values` array.

I've also added a size check in `rehash()`, so that it fails instead of reporting invalid item indices.

Author: Vyacheslav Baranov <slavik.baranov@gmail.com>

Closes #6763 from SlavikBaranov/SPARK-8309 and squashes the following commits:

8557445 [Vyacheslav Baranov] Resolved review comments
4d5b954 [Vyacheslav Baranov] Resolved review comments
eaf1e68 [Vyacheslav Baranov] Fixed failing test
f9284fd [Vyacheslav Baranov] Resolved review comments
3920656 [Vyacheslav Baranov] SPARK-8309: Support for more than 12M items in OpenHashMap
This commit is contained in:
Vyacheslav Baranov 2015-06-17 09:42:29 +01:00 committed by Sean Owen
parent e3de14d3b2
commit c13da20a55
3 changed files with 19 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
core/src/main/scala/org/apache/spark/util/collection/OpenHashSet.scala
View file

@ -45,7 +45,8 @@ class OpenHashSet[@specialized(Long, Int) T: ClassTag](
loadFactor: Double)
extends Serializable {
require(initialCapacity <= (1 << 29), "Can't make capacity bigger than 2^29 elements")
require(initialCapacity <= OpenHashSet.MAX_CAPACITY,
s"Can't make capacity bigger than ${OpenHashSet.MAX_CAPACITY} elements")
require(initialCapacity >= 1, "Invalid initial capacity")
require(loadFactor < 1.0, "Load factor must be less than 1.0")
require(loadFactor > 0.0, "Load factor must be greater than 0.0")
@ -223,6 +224,8 @@ class OpenHashSet[@specialized(Long, Int) T: ClassTag](
*/
private def rehash(k: T, allocateFunc: (Int) => Unit, moveFunc: (Int, Int) => Unit) {
val newCapacity = _capacity * 2
require(newCapacity > 0 && newCapacity <= OpenHashSet.MAX_CAPACITY,
s"Can't contain more than ${(loadFactor * OpenHashSet.MAX_CAPACITY).toInt} elements")
allocateFunc(newCapacity)
val newBitset = new BitSet(newCapacity)
val newData = new Array[T](newCapacity)
@ -276,9 +279,10 @@ class OpenHashSet[@specialized(Long, Int) T: ClassTag](
private[spark]
object OpenHashSet {
val MAX_CAPACITY = 1 << 30
val INVALID_POS = -1
val NONEXISTENCE_MASK = 0x80000000
val POSITION_MASK = 0xEFFFFFF
val NONEXISTENCE_MASK = 1 << 31
val POSITION_MASK = (1 << 31) - 1
/**
* A set of specialized hash function implementation to avoid boxing hash code computation

12
core/src/test/scala/org/apache/spark/util/collection/OpenHashMapSuite.scala
View file

@ -44,7 +44,7 @@ class OpenHashMapSuite extends SparkFunSuite with Matchers {
val goodMap3 = new OpenHashMap[String, String](256)
assert(goodMap3.size === 0)
intercept[IllegalArgumentException] {
new OpenHashMap[String, Int](1 << 30) // Invalid map size: bigger than 2^29
new OpenHashMap[String, Int](1 << 30 + 1) // Invalid map size: bigger than 2^30
}
intercept[IllegalArgumentException] {
new OpenHashMap[String, Int](-1)
@ -186,4 +186,14 @@ class OpenHashMapSuite extends SparkFunSuite with Matchers {
map(null) = 0
assert(map.contains(null))
}
test("support for more than 12M items") {
val cnt = 12000000 // 12M
val map = new OpenHashMap[Int, Int](cnt)
for (i <- 0 until cnt) {
map(i) = 1
}
val numInvalidValues = map.iterator.count(_._2 == 0)
assertResult(0)(numInvalidValues)
}
}

2
core/src/test/scala/org/apache/spark/util/collection/PrimitiveKeyOpenHashMapSuite.scala
View file

@ -44,7 +44,7 @@ class PrimitiveKeyOpenHashMapSuite extends SparkFunSuite with Matchers {
val goodMap3 = new PrimitiveKeyOpenHashMap[Int, Int](256)
assert(goodMap3.size === 0)
intercept[IllegalArgumentException] {
new PrimitiveKeyOpenHashMap[Int, Int](1 << 30) // Invalid map size: bigger than 2^29
new PrimitiveKeyOpenHashMap[Int, Int](1 << 30 + 1) // Invalid map size: bigger than 2^30
}
intercept[IllegalArgumentException] {
new PrimitiveKeyOpenHashMap[Int, Int](-1)