Sean Zhong created SPARK-17306:
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Summary: Memory leak in QuantileSummaries
Key: SPARK-17306
URL: https://issues.apache.org/jira/browse/SPARK-17306
Project: Spark
Issue Type: Bug
Reporter: Sean Zhong
compressThreshold was not referenced anywhere
{code}
class QuantileSummaries(
val compressThreshold: Int,
val relativeError: Double,
val sampled: ArrayBuffer[Stats] = ArrayBuffer.empty,
private[stat] var count: Long = 0L,
val headSampled: ArrayBuffer[Double] = ArrayBuffer.empty) extends
Serializable
{code}
And, it causes memory leak, QuantileSummaries takes unbounded memory
{code}
val summary = new QuantileSummaries(10000, relativeError = 0.001)
// Results in creating an array of size 100000000 !!!
(1 to 100000000).foreach(summary.insert(_))
{code}
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