Details

    • Type: Sub-task
    • Status: Resolved
    • Priority: Blocker
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2.0.0
    • Component/s: Structured Streaming
    • Labels:
      None
    • Target Version/s:

      Description

      Bug in Python DataStreamReader API made it unusable. Because a single path was being converted to a array before calling Java DataStreamReader method (which takes a string only), it gave the following error.

      File "/Users/tdas/Projects/Spark/spark/python/pyspark/sql/readwriter.py", line 947, in pyspark.sql.readwriter.DataStreamReader.json
      Failed example:
          json_sdf = spark.readStream.json(os.path.join(tempfile.mkdtemp(), 'data'),                 schema = sdf_schema)
      Exception raised:
          Traceback (most recent call last):
            File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/doctest.py", line 1253, in __run
              compileflags, 1) in test.globs
            File "<doctest pyspark.sql.readwriter.DataStreamReader.json[0]>", line 1, in <module>
              json_sdf = spark.readStream.json(os.path.join(tempfile.mkdtemp(), 'data'),                 schema = sdf_schema)
            File "/Users/tdas/Projects/Spark/spark/python/pyspark/sql/readwriter.py", line 963, in json
              return self._df(self._jreader.json(path))
            File "/Users/tdas/Projects/Spark/spark/python/lib/py4j-0.10.1-src.zip/py4j/java_gateway.py", line 933, in __call__
              answer, self.gateway_client, self.target_id, self.name)
            File "/Users/tdas/Projects/Spark/spark/python/pyspark/sql/utils.py", line 63, in deco
              return f(*a, **kw)
            File "/Users/tdas/Projects/Spark/spark/python/lib/py4j-0.10.1-src.zip/py4j/protocol.py", line 316, in get_return_value
              format(target_id, ".", name, value))
          Py4JError: An error occurred while calling o121.json. Trace:
          py4j.Py4JException: Method json([class java.util.ArrayList]) does not exist
          	at py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:318)
          	at py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:326)
          	at py4j.Gateway.invoke(Gateway.java:272)
          	at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:128)
          	at py4j.commands.CallCommand.execute(CallCommand.java:79)
          	at py4j.GatewayConnection.run(GatewayConnection.java:211)
          	at java.lang.Thread.run(Thread.java:744)
      

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            • Assignee:
              tdas Tathagata Das
              Reporter:
              tdas Tathagata Das
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              • Created:
                Updated:
                Resolved: