pyflink winerror 2 get_gateway() - apache-flink

Question

Following a script on stackOverflow link as described by the link with the only change of the data in the sense I would like to evaluate the simple usage of pyflink in order to analyze if the installation of it works.You can see below the system and in order to install it I use pip -m install apache-flink into a virtual environment with python3.8.4. In order to install flink itself I used docker and I import the images of pyflink/playgrounds:1.10.0. Below is there the only the part taken from link that I modify
source_ddl = """
CREATE TABLE MyUserTable (
column_a INT,
column_b INT,
) WITH (
'connector' = 'filesystem',
'path' = 'file:///Users//code/examples/input.csv ',
'format' = 'csv'
)"""
#connector for data output/sink
sink_ddl = """
CREATE TABLE results (
score INT)
WITH (
'connector' = 'filesystem',
'path' = 'file:///Users//code/examples/output.csv',
'format' = 'csv'
)"""
#make the table corresponding to the schema mentioned
source_table = table_env.execute_sql(source_ddl)
sink_table = table_env.execute_sql(sink_ddl)
#convert the sql table to table API
table_path = table_env.from_path("MyUserTable")
# execute SELECT statement
table_result2 = table_env.execute_sql("SELECT column_a FROM MyUserTable")
table_result2.print()
The error is the following:
Traceback (most recent call last):
File ".\flink1.py", line 15, in <module>
env_settings = EnvironmentSettings.new_instance().in_batch_mode().use_blink_planner().build()
File "C:\Users\landr\AppData\Local\Programs\Python\Python38\lib\site-packages\pyflink\table\environment_settings.py", line 214, in new_instance
return EnvironmentSettings.Builder()
File "C:\Users\landr\AppData\Local\Programs\Python\Python38\lib\site-packages\pyflink\table\environment_settings.py", line 48, in __init__
gateway = get_gateway()
File "C:\Users\landr\AppData\Local\Programs\Python\Python38\lib\site-packages\pyflink\java_gateway.py", line 62, in get_gateway
_gateway = launch_gateway()
File "C:\Users\landr\AppData\Local\Programs\Python\Python38\lib\site-packages\pyflink\java_gateway.py", line 106, in launch_gateway
p = launch_gateway_server_process(env, args)
File "C:\Users\landr\AppData\Local\Programs\Python\Python38\lib\site-packages\pyflink\pyflink_gateway_server.py", line 221, in launch_gateway_server_process
return Popen(command, stdin=PIPE, preexec_fn=preexec_fn, env=env)
File "C:\Users\landr\AppData\Local\Programs\Python\Python38\lib\subprocess.py", line 854, in __init__
self._execute_child(args, executable, preexec_fn, close_fds,
File "C:\Users\landr\AppData\Local\Programs\Python\Python38\lib\subprocess.py", line 1307, in _execute_child
hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
FileNotFoundError: [WinError 2] Impossibile trovare il file specificato

Answer 1

I encountered this error today. I put a print statement into pyflink_gateway_server.py to show the command being passed. I found that the call was to a version of Java that no longer existed on my computer (I’d upgraded it).
The fix was to ensure that JAVA_HOME pointed to a valid Java installation.