我正在尝试将word2vec模型对象传递给我的Spark UDF。基本上,我有一个带有电影ID的测试数据集,并且我想将ID与模型对象一起传递,以获取每行的推荐电影数组。
def udfGetSynonyms(model: org.apache.spark.ml.feature.Word2VecModel) =
udf((col : String) => {
model.findSynonymsArray("20", 1)
})
然而,这给了我一个空指针异常。当我在udf外运行model.findSynonymsArray("20", 1)时,我得到了预期的答案。由于某种原因它不理解udf中的函数,但是可以在udf外运行它。
注意:我在这里添加了“20”,只是为了得到一个固定的答案,看看是否有效。如果我用col替换“20”,它也会出现相同的情况。
感谢您的帮助!
StackTrace:
SparkException: Job aborted due to stage failure: Task 0 in stage 23127.0 failed 4 times, most recent failure: Lost task 0.3 in stage 23127.0 (TID 4646648, 10.56.243.178, executor 149): org.apache.spark.SparkException: Failed to execute user defined function($anonfun$udfGetSynonyms1$1: (string) => array<struct<_1:string,_2:double>>)
at org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIteratorForCodegenStage2.processNext(Unknown Source)
at org.apache.spark.sql.execution.BufferedRowIterator.hasNext(BufferedRowIterator.java:43)
at org.apache.spark.sql.execution.WholeStageCodegenExec$$anonfun$10$$anon$1.hasNext(WholeStageCodegenExec.scala:614)
at org.apache.spark.sql.execution.collect.UnsafeRowBatchUtils$.encodeUnsafeRows(UnsafeRowBatchUtils.scala:49)
at org.apache.spark.sql.execution.collect.Collector$$anonfun$2.apply(Collector.scala:126)
at org.apache.spark.sql.execution.collect.Collector$$anonfun$2.apply(Collector.scala:125)
at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
at org.apache.spark.scheduler.Task.run(Task.scala:111)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:350)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
at org.apache.spark.ml.feature.Word2VecModel.findSynonymsArray(Word2Vec.scala:273)
at linebb57ebe901e04c40a4fba9fb7416f724554.$read$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$anonfun$udfGetSynonyms1$1.apply(command-232354:7)
at linebb57ebe901e04c40a4fba9fb7416f724554.$read$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$anonfun$udfGetSynonyms1$1.apply(command-232354:4)
... 12 more
findSynonyms
内部使用了分布式操作。你需要找到另一种方法来解决这个问题。 - zero323