Re: [HTCondor-users] On the thread-safety of submit, query and history in htcondor python binding

[Brian Bockelman <bbockelm@xxxxxxxxxxx>]

Thanks Weiming,

Two questions:

- what version of HTCondor?  I know there was one threading bug fix recently, but I think it was for a different function.

- are there any errors or complaints in the ScheddLog?

Brian

Sent from my iPhone

On Oct 20, 2016, at 7:51 PM, Weiming Shi <swmtrc@xxxxxxxxx> wrote:

Hi Brian,

Thanks for your reply. I have written a simple test script to submit job classads from two threads created by threading module. 

The submit in one of the threads will fail with the error message: RuntimeError: Failed to connect to schedd. The RuntimeError won't show up if i use a lock to make the submit a synchronous operation.

I will appreciate it if you can take a look at it. Thanks

The code is as follows:

#!/bin/env python

import htcondor

import classad

import threading

def spawn():

    schedd = htcondor.Schedd()

    print "%r" % schedd

    schedd.submit(classad.ClassAd({"Cmd": "/bin/echo"}))

for i in range(2):

    t = threading.Thread(target=spawn)

    t.start()

On Thu, Oct 20, 2016 at 7:28 PM, Brian Bockelman <bbockelm@xxxxxxxxxxx> wrote:

Hi Weiming,

To the best of my knowledge, everything should be threadsafe; if you find issues, that would indicate a bug and I'd be happy to look into that.

Brian

Sent from my iPhone

On Oct 20, 2016, at 6:13 PM, Weiming Shi <swmtrc@xxxxxxxxx> wrote:

Hi all,

I have a question regarding to the thread-safety of the methods of htcondor python binding.  Are the underlying methods exposed by  htcondor python binding thread-safe, especially 'submit', 'query', 'history' methods of Schedd class? 

A initial test seems to be NO.

Thanks.

Weiming Shi

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