[jira] [Created] (SPARK-5425) ConcurrentModificationException during SparkConf creation

["Jacek Lewandowski (JIRA)" <ji...@apache.org>]

Jacek Lewandowski created SPARK-5425:
----------------------------------------

             Summary: ConcurrentModificationException during SparkConf creation
                 Key: SPARK-5425
                 URL: https://issues.apache.org/jira/browse/SPARK-5425
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
    Affects Versions: 1.2.0, 1.1.1
            Reporter: Jacek Lewandowski


This fragment of code:

{code}
  if (loadDefaults) {
    // Load any spark.* system properties
    for ((k, v) <- System.getProperties.asScala if k.startsWith("spark.")) {
      settings(k) = v
    }
  }
{code}

causes 

{noformat}
ERROR 09:43:15  SparkMaster service caused error in state STARTINGjava.util.ConcurrentModificationException: null
	at java.util.Hashtable$Enumerator.next(Hashtable.java:1167) ~[na:1.7.0_60]
	at scala.collection.convert.Wrappers$JPropertiesWrapper$$anon$3.next(Wrappers.scala:458) ~[scala-library-2.10.4.jar:na]
	at scala.collection.convert.Wrappers$JPropertiesWrapper$$anon$3.next(Wrappers.scala:454) ~[scala-library-2.10.4.jar:na]
	at scala.collection.Iterator$class.foreach(Iterator.scala:727) ~[scala-library-2.10.4.jar:na]
	at scala.collection.AbstractIterator.foreach(Iterator.scala:1157) ~[scala-library-2.10.4.jar:na]
	at scala.collection.IterableLike$class.foreach(IterableLike.scala:72) ~[scala-library-2.10.4.jar:na]
	at scala.collection.AbstractIterable.foreach(Iterable.scala:54) ~[scala-library-2.10.4.jar:na]
	at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:771) ~[scala-library-2.10.4.jar:na]
	at org.apache.spark.SparkConf.<init>(SparkConf.scala:53) ~[spark-core_2.10-1.2.1_dse-20150121.075638-2.jar:1.2.1_dse-SNAPSHOT]
	at org.apache.spark.SparkConf.<init>(SparkConf.scala:47) ~[spark-core_2.10-1.2.1_dse-20150121.075638-2.jar:1.2.1_dse-SNAPSHOT]
{noformat}

when there is another thread which modifies system properties at the same time. 

The problem actually lies in Scala wrapper over Java Properties which uses thread-unsafe access to properties when traversing them.

This bug https://issues.scala-lang.org/browse/SI-7775 is somehow related to the issue and shows that the problem has been also found elsewhere. 




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