dsage jobs get lost by server

[rlm]

Apparently, a large number of jobs in a small time can cause the dsage server to hang, while there are waiting jobs and workers.

[yi]

Please include as much information as you can on this bug, including repro steps.

[yi]

Problem seems to be a race condition between the task that downloads new jobs and the task that checks for results. A temporary fix is to introduce a 1 second delay to all jobs to make sure this race condition doesn't happen.

[rlm]

Reproduction steps ( takes about 6 hours ... )

rlmill@sage:~/sage-2.8.4.1$ ./sage
----------------------------------------------------------------------
| SAGE Version 2.8.4.2.1, Release Date: 2007-09-20                   |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------

sage: d = dsage.start_all()
Spawned dsage_server.py -d /home/rlmill/.sage/dsage/db/dsage.db -p 8081 -l 0 -f /home/rlmill/.sage/dsage/server.log -c /home/rlmill/.sage/dsage/pubcert.pem -k /home/rlmill/.sage/dsage/cacert.pem --statsfile=/home/rlmill/.sage/dsage/dsage.xml --ssl --noblock (pid = 25908)

Spawned dsage_worker.py -s localhost -p 8081 -u rlmill -w 2 --poll 1.0 -l 0 -f /home/rlmill/.sage/dsage/worker.log --privkey=/home/rlmill/.sage/dsage/dsage_key --pubkey=/home/rlmill/.sage/dsage/dsage_key.pub --priority=20  --ssl --noblock (pid = 25911)

sage: import sage.graphs.bruhat_sn
sage: from sage.graphs.bruhat_sn import DistributedBruhatIntervals, BruhatDatabase
sage: db = BruhatDatabase('/home/rlmill/database.db')
sage: dbi = DistributedBruhatIntervals(d, db)
sage: dbi.start()

[rlm]

This seems to have been fixed by one of Yi's patches.

[mabshoff]

Fixed by an earlier patch of Yi according to the original reporter.