Google App Engine: upload_data fails because "the target machine has actively abandoned it" on devserver

Question

I am trying to load data from CSV into my application using devserver:

appcfg.py upload_data --config_file="DataLoader.py" --filename="data.csv" --kind=Foo --url=http://localhost:8083/remote_api "path/to/app" 

Result:

 Application: appname; version: 1. Uploading data records. [INFO ] Logging to bulkloader-log-20100626.181045 [INFO ] Throttling transfers: [INFO ] Bandwidth: 250000 bytes/second [INFO ] HTTP connections: 8/second [INFO ] Entities inserted/fetched/modified: 20/second [INFO ] Batch Size: 10 [INFO ] Opening database: bulkloader-progress-20100626.181045.sql3 Please enter login credentials for localhost Email: [e-mail] Password for [e-mail] : [INFO ] Connecting to localhost:8083/remote_api [INFO ] Starting import; maximum 10 entities per post Google\google_appengine\google\appengine\api\datastore_types.py:673: DeprecationWarning: object.__init__() takes no parameters super(Link, self).__init__(self, link) ............[INFO ] Unexpected thread death: WorkerThread-7 [INFO ] An error occurred. Shutting down... ........[ERROR ] Error in WorkerThread-1: <urlopen error [Errno 10061] No connection could be made because the target machine actively refused it> [ERROR ] Error in WorkerThread-7: <urlopen error [Errno 10061] No connection could be made because the target machine actively refused it> [INFO ] 1230 entites total, 0 previously transferred [INFO ] 200 entities (218274 bytes) transferred in 25.8 seconds [INFO ] Some entities not successfully transferred 

The number of objects transferred varies between 200-850 when I try to execute the following times.

What's going on here? This usually works fine. Navigating to http://localhost:8083/ works, and the application works fine. (Except for lack of data.)

Answer 1

Reduce the number of threads to 4 by adding the command line parameter --num_threads=4

If it still does not work, reduce the number of threads.