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https://issues.apache.org/jira/browse/CASSANDRA-11574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15251530#comment-15251530
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Stefania edited comment on CASSANDRA-11574 at 4/22/16 12:06 AM:
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You're welcome, thanks for helping us debug this.

-.pyc- .c and .so are actually Cython extensions and they must be deleted 
manually or else changing the .py has not effect. I had no idea they would be 
present in package deployments. CASSANDRA-11053, which was delivered in 3.0.5, 
modified _pylib/setup.py_ so that people can create these files manually for 
added performance by typing {{python setup.py build_ext --inplace}} in the 
pylib folder. They must be generated somewhere when the package is created. 
[~mshuler]: do you know how the packaging process uses _pylib/setup.py_?

The initial solution, {{copy_options\['numprocesses'\] = 
int(opts.pop('numprocesses', self.get_num_processes(16)))}} is actually 
correct, provided the -.pyc- .c and .so are regenerated by running {{python 
setup.py build_ext --inplace}} or, as you already pointed out, if they are 
removed (in which case the original code also works).

I will prepare a patch so that the Cython extensions also work.


was (Author: stefania):
You're welcome, thanks for helping us debug this.

.pyc and .so are actually Cython extensions and they must be deleted manually 
or else changing the .py has not effect. I had no idea they would be present in 
package deployments. CASSANDRA-11053, which was delivered in 3.0.5, modified 
_pylib/setup.py_ so that people can create these files manually for added 
performance by typing {{python setup.py build_ext --inplace}} in the pylib 
folder. They must be generated somewhere when the package is created. 
[~mshuler]: do you know how the packaging process uses _pylib/setup.py_?

The initial solution, {{copy_options\['numprocesses'\] = 
int(opts.pop('numprocesses', self.get_num_processes(16)))}} is actually 
correct, provided the .pyc and .so are regenerated by running {{python setup.py 
build_ext --inplace}} or, as you already pointed out, if they are removed (in 
which case the original code also works).

I will prepare a patch so that the Cython extensions also work.

> COPY FROM command in cqlsh throws error
> ---------------------------------------
>
>                 Key: CASSANDRA-11574
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11574
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tools
>         Environment: Operating System: Ubuntu Server 14.04
> JDK: Oracle JDK 8 update 77
> Python: 2.7.6
>            Reporter: Mahafuzur Rahman
>            Assignee: Stefania
>              Labels: cqlsh
>             Fix For: 2.1.x, 2.2.x, 3.0.x, 3.x
>
>
> Any COPY FROM command in cqlsh is throwing the following error:
> "get_num_processes() takes no keyword arguments"
> Example command: 
> COPY inboxdata 
> (to_user_id,to_user_network,created_time,attachments,from_user_id,from_user_name,from_user_network,id,message,to_user_name,updated_time)
>  FROM 'inbox.csv';
> Similar commands worked parfectly in the previous versions such as 3.0.4



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