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From Cinyoung Hur <cinyoung....@gmail.com>
Subject pyspark.sql.DataFrame write error to Postgres DB
Date Fri, 21 Apr 2017 02:54:28 GMT
Hi,

I tried to insert Dataframe into Postgres DB.

But, I don't know what causes this error.


properties = {
    "user": "user",
    "password": "pass",
    "driver": "com.mysql.jdbc.Driver",
}
url = "jdbc:mysql://ip
address/MYDB?useServerPrepStmts=false&rewriteBatchedStatements=true"
df.write.jdbc(url=url, table=table_name, mode='overwrite',
properties=properties)



The schema of Dataframe is this.

root
 |-- fom_tp_cd: string (nullable = true)
 |-- agg: integer (nullable = true)
 |-- sex_tp_cd: integer (nullable = true)
 |-- dgsbjt_cd: string (nullable = true)
 |-- recu_cl_cd: integer (nullable = true)
 |-- sick_set: string (nullable = true)
 |-- gnl_nm_set: string (nullable = true)
 |-- count: long (nullable = false)



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

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