Andrew Or created SPARK-10563:
---------------------------------
Summary: SparkContext's local properties should be cloned when
inherited
Key: SPARK-10563
URL: https://issues.apache.org/jira/browse/SPARK-10563
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 1.0.0
Reporter: Andrew Or
Assignee: Andrew Or
Currently, when a child thread inherits local properties from the parent
thread, it gets a reference of the parent's local properties and uses them as
default values.
The problem, however, is that when the parent changes the value of an existing
property, the changes are reflected in the child thread! This has very
confusing semantics, especially in streaming.
{code}
private val localProperties = new InheritableThreadLocal[Properties] {
override protected def childValue(parent: Properties): Properties = new
Properties(parent)
override protected def initialValue(): Properties = new Properties()
}
{code}
Instead, we should make a clone of the parent properties rather than passing in
a mutable reference.
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