USACE / USACE/cwms-data-api

Connections Limit Reached

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Dominant language
Java
Stars
28
Forks
25
Avg merge
4d 22h
Merged PRs (30d)
20

Description

I am running a script to create one the MRBWM bulletins and am using threading to retrieve data with CWMSpy/CDA. I am running into what appears to be connection errors. If run the script for a couple projects, I do not get any errors, but when I run it for all the projects, the script throws a CDA 500 error. Looking at the Apache logs, we think it is due to my users connection limit, but is there a way to increase this limit so we can create a complete bulletin?

Image

`Exception has occurred: ConnectionError
('Connection aborted.', RemoteDisconnected('Remote end closed connection without response'))
http.client.RemoteDisconnected: Remote end closed connection without response

During handling of the above exception, another exception occurred:

urllib3.exceptions.ProtocolError: ('Connection aborted.', RemoteDisconnected('Remote end closed connection without response'))

During handling of the above exception, another exception occurred:

File "C:\Users\ryan\OneDrive - US Army Corps of Engineers\Documents\Projects\Git_Repositories\MRBWM_Scripts\CWMS_Python\g7cwpa30\cronjobs\Server_Utils_Py.py", line 134, in retrieveCwmsData
if TimeseriesExists : data = cwms.get_timeseries(ts_id, office_id='NWDM', begin = Start_Time_DT, end = End_Time_DT, page_size=300000)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
requests.exceptions.ConnectionError: ('Connection aborted.', RemoteDisconnected('Remote end closed connection without response'))`

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First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with cronjobs/Server_Utils_Py.py at line 134 and the cwms.get_timeseries call, then compare the client traceback with the Apache logs and CDA 500 response. Check how threaded requests and page_size=300000 relate to the server's connection limit. Done means identifying the limiting configuration or failure cause and confirming that a complete bulletin runs without the connection abort.

Written by the indexing model from the issue text.

Assessment

Tech stack
apache, java, python
Domain
api, backend, networking
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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