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https://issues.apache.org/jira/browse/SPARK-25694?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun updated SPARK-25694:
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Affects Version/s: 3.0.0
2.4.4
> URL.setURLStreamHandlerFactory causing incompatible HttpURLConnection issue
> ---------------------------------------------------------------------------
>
> Key: SPARK-25694
> URL: https://issues.apache.org/jira/browse/SPARK-25694
> Project: Spark
> Issue Type: Bug
> Components: Spark Core, SQL
> Affects Versions: 2.3.0, 2.3.1, 2.3.2, 2.4.4, 3.0.0
> Reporter: Bo Yang
> Priority: Minor
>
> URL.setURLStreamHandlerFactory() in SharedState causes URL.openConnection()
> returns FsUrlConnection object, which is not compatible with
> HttpURLConnection. This will cause exception when using some third party http
> library (e.g. scalaj.http).
> The following code in Spark 2.3.0 introduced the issue:
> sql/core/src/main/scala/org/apache/spark/sql/internal/SharedState.scala:
> {code}
> object SharedState extends Logging { ...
> URL.setURLStreamHandlerFactory(new FsUrlStreamHandlerFactory()) ...
> }
> {code}
> Here is the example exception when using scalaj.http in Spark:
> {code}
> StackTrace: scala.MatchError:
> org.apache.hadoop.fs.FsUrlConnection:[http://wwww.example.com|http://wwww.example.com/]
> (of class org.apache.hadoop.fs.FsUrlConnection)
> at
> scalaj.http.HttpRequest.scalaj$http$HttpRequest$$doConnection(Http.scala:343)
> at scalaj.http.HttpRequest.exec(Http.scala:335)
> at scalaj.http.HttpRequest.asString(Http.scala:455)
> {code}
>
> One option to fix the issue is to return null in
> URLStreamHandlerFactory.createURLStreamHandler when the protocol is
> http/https, so it will use the default behavior and be compatible with
> scalaj.http. Following is the code example:
> {code}
> class SparkUrlStreamHandlerFactory extends URLStreamHandlerFactory with
> Logging {
> private val fsUrlStreamHandlerFactory = new FsUrlStreamHandlerFactory()
> override def createURLStreamHandler(protocol: String): URLStreamHandler = {
> val handler = fsUrlStreamHandlerFactory.createURLStreamHandler(protocol)
> if (handler == null) {
> return null
> }
> if (protocol != null &&
> (protocol.equalsIgnoreCase("http")
> || protocol.equalsIgnoreCase("https"))) {
> // return null to use system default URLStreamHandler
> null
> } else {
> handler
> }
> }
> }
> {code}
> I would like to get some discussion here before submitting a pull request.
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