I've also been having this problem.
Did you manage to find any workarounds?
On Saturday, March 2, 2013 4:25:17 AM UTC, Jamie Niemasik wrote:
>
> I've been receiving intermittent errors from MapReduce jobs. I'm running
> Python 2.7.
>
> The specific error is "BadValueError: name must be under 500 bytes" which
> is raised when calling datastore.Key.from_path() within
> blobstore.get_blob_key(); the filename being provided is way too long to
> make a key from.
>
> This all occurs within the code in the mapreduce package… nothing in my
> code seems to affect it.
>
> Some of the filenames are 288 bytes long, while some are 992. The M/R spec
> name and id in each case is nearly the same and is very short; I don't see
> where this variance comes from.
>
> The sequence of events is this:
> mapreduce.output_writers.init_job() creates a reasonable, short filename
> and passes it to files.blobstore.create()
> create() calls files.file._create('blobstore', …, filename)
> _create() sets up an rpc with that filename and calls _make_call('Create',
> ...)
>
> And that call sometimes returns a filename that's 288 bytes, sometimes
> 992. I have no idea why or how to work around this — any help would be
> appreciated.
>
> Thanks,
> Jamie
>
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