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https://issues.apache.org/jira/browse/SPARK-18910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15756385#comment-15756385
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Hong Shen commented on SPARK-18910:
-----------------------------------
Should I add a pull request to resolve this problem?
> Can't use UDF that jar file in hdfs
> -----------------------------------
>
> Key: SPARK-18910
> URL: https://issues.apache.org/jira/browse/SPARK-18910
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.2
> Reporter: Hong Shen
>
> When I create a UDF that jar file in hdfs, I can't use the UDF.
> <code>
> spark-sql> create function trans_array as 'com.test.udf.TransArray' using
> jar
> 'hdfs://host1:9000/spark/dev/share/libs/spark-proxy-server-biz-service-impl-1.0.0.jar';
> spark-sql> describe function trans_array;
> Function: test_db.trans_array
> Class: com.alipay.spark.proxy.server.biz.service.impl.udf.TransArray
> Usage: N/A.
> Time taken: 0.127 seconds, Fetched 3 row(s)
> spark-sql> select trans_array(1, '\\|', id, position) as (id0, position0)
> from test_spark limit 10;
> Error in query: Undefined function: 'trans_array'. This function is neither a
> registered temporary function nor a permanent function registered in the
> database 'test_db'.; line 1 pos 7
> </code>
> The reason is when
> org.apache.spark.sql.internal.SessionState.FunctionResourceLoader.loadResource,
> the uri.toURL throw exception with " failed unknown protocol: hdfs"
> <code>
> def addJar(path: String): Unit = {
> sparkSession.sparkContext.addJar(path)
> val uri = new Path(path).toUri
> val jarURL = if (uri.getScheme == null) {
> // `path` is a local file path without a URL scheme
> new File(path).toURI.toURL
> } else {
> // `path` is a URL with a scheme
> uri.toURL
> }
> jarClassLoader.addURL(jarURL)
> Thread.currentThread().setContextClassLoader(jarClassLoader)
> }
> </code>
> I think we should setURLStreamHandlerFactory method on URL with an instance
> of FsUrlStreamHandlerFactory, just like:
> <code>
> static {
> // This method can be called at most once in a given JVM.
> URL.setURLStreamHandlerFactory(new FsUrlStreamHandlerFactory());
> }
> </code>
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