[SPARK-7913] [CORE] Make AppendOnlyMap use the same growth strategy of OpenHashSet and consistent exception message
This is a follow up PR for #6456 to make AppendOnlyMap consistent with OpenHashSet. /cc srowen andrewor14 Author: zsxwing <zsxwing@gmail.com> Closes #6879 from zsxwing/append-only-map and squashes the following commits: 912c0ad [zsxwing] Fix the doc dd4385b [zsxwing] Make AppendOnlyMap use the same growth strategy of OpenHashSet and consistent exception message
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@ -32,7 +32,7 @@ import org.apache.spark.annotation.DeveloperApi
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* size, which is guaranteed to explore all spaces for each key (see
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* http://en.wikipedia.org/wiki/Quadratic_probing).
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*
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* The map can support up to `536870912 (2 ^ 29)` elements.
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* The map can support up to `375809638 (0.7 * 2 ^ 29)` elements.
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*
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* TODO: Cache the hash values of each key? java.util.HashMap does that.
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*/
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@ -199,11 +199,8 @@ class AppendOnlyMap[K, V](initialCapacity: Int = 64)
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/** Increase table size by 1, rehashing if necessary */
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private def incrementSize() {
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if (curSize == MAXIMUM_CAPACITY) {
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throw new IllegalStateException(s"Can't put more that ${MAXIMUM_CAPACITY} elements")
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}
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curSize += 1
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if (curSize > growThreshold && capacity < MAXIMUM_CAPACITY) {
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if (curSize > growThreshold) {
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growTable()
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}
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}
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@ -216,7 +213,8 @@ class AppendOnlyMap[K, V](initialCapacity: Int = 64)
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/** Double the table's size and re-hash everything */
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protected def growTable() {
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// capacity < MAXIMUM_CAPACITY (2 ^ 29) so capacity * 2 won't overflow
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val newCapacity = (capacity * 2).min(MAXIMUM_CAPACITY)
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val newCapacity = capacity * 2
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require(newCapacity <= MAXIMUM_CAPACITY, s"Can't contain more than ${growThreshold} elements")
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val newData = new Array[AnyRef](2 * newCapacity)
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val newMask = newCapacity - 1
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// Insert all our old values into the new array. Note that because our old keys are
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