Hi, I'm trying to write dataframe to MariaDB.
I got this error message, but I have no clue.
Please give some advice.
Py4JJavaErrorTraceback (most recent call
last)<ipython-input-64-300efd2c6967> in <module>()----> 1
result1.filter(result1["gnl_nm_set"] == "").count()
/usr/local/linewalks/spark/spark/python/pyspark/sql/dataframe.pyc in
count(self) 297 2 298 """--> 299 return
int(self._jdf.count()) 300 301 @ignore_unicode_prefix
/usr/local/linewalks/spark/spark/python/lib/py4j-0.10.1-src.zip/py4j/java_gateway.py
in __call__(self, *args) 931 answer =
self.gateway_client.send_command(command) 932 return_value
= get_return_value(--> 933 answer, self.gateway_client,
self.target_id, self.name) 934 935 for temp_arg in
temp_args:
/usr/local/linewalks/spark/spark/python/pyspark/sql/utils.pyc in
deco(*a, **kw) 61 def deco(*a, **kw): 62 try:--->
63 return f(*a, **kw) 64 except
py4j.protocol.Py4JJavaError as e: 65 s =
e.java_exception.toString()
/usr/local/linewalks/spark/spark/python/lib/py4j-0.10.1-src.zip/py4j/protocol.py
in get_return_value(answer, gateway_client, target_id, name) 310
raise Py4JJavaError( 311 "An error
occurred while calling {0}{1}{2}.\n".--> 312
format(target_id, ".", name), value) 313 else: 314
raise Py4JError(
Py4JJavaError: An error occurred while calling o1331.count.
: org.apache.spark.SparkException: Job aborted due to stage failure:
Task 178 in stage 324.0 failed 4 times, most recent failure: Lost task
178.3 in stage 324.0 (TID 14274, 7.linewalks.local):
org.apache.spark.api.python.PythonException: Traceback (most recent
call last):
File
"/home/hadoop/hdtmp/nm-local-dir/usercache/hadoop/appcache/application_1491889279272_0040/container_1491889279272_0040_01_000003/pyspark.zip/pyspark/worker.py",
line 172, in main
process()
File
"/home/hadoop/hdtmp/nm-local-dir/usercache/hadoop/appcache/application_1491889279272_0040/container_1491889279272_0040_01_000003/pyspark.zip/pyspark/worker.py",
line 167, in process
serializer.dump_stream(func(split_index, iterator), outfile)
File
"/home/hadoop/hdtmp/nm-local-dir/usercache/hadoop/appcache/application_1491889279272_0040/container_1491889279272_0040_01_000003/pyspark.zip/pyspark/worker.py",
line 106, in <lambda>
func = lambda _, it: map(mapper, it)
File
"/home/hadoop/hdtmp/nm-local-dir/usercache/hadoop/appcache/application_1491889279272_0040/container_1491889279272_0040_01_000003/pyspark.zip/pyspark/worker.py",
line 92, in <lambda>
mapper = lambda a: udf(*a)
File
"/home/hadoop/hdtmp/nm-local-dir/usercache/hadoop/appcache/application_1491889279272_0040/container_1491889279272_0040_01_000003/pyspark.zip/pyspark/worker.py",
line 70, in <lambda>
return lambda *a: f(*a)
File "<ipython-input-22-457936c8f59f>", line 3, in <lambda>
TypeError: sequence item 0: expected string, NoneType found
