perfSONAR User Q&A and Other Discussion

[Prannoy Sablok <>]

Hi all,

I have been trying to run a pscheduler task on a server but it keeps throwing the following error -

~$ pscheduler task throughput dtn.singaren.net.sg

Could not find test throughput on server

This occurs with all pscheduler tasks. I checked service status and there seems to be a problem with the ticker service, as below - 

~$ systemctl status pscheduler-ticker.service

● pscheduler-ticker.service - pScheduler server - ticker

   Loaded: loaded (/lib/systemd/system/pscheduler-ticker.service; enabled; vendor preset: enabled)

   Active: activating (auto-restart) (Result: exit-code) since Thu 2021-07-29 00:43:44 CDT; 679ms ago

  Process: 27223 ExecStopPost=/bin/rm -rf /var/run/pscheduler-server/ticker (code=exited, status=0/SUCCESS)

  Process: 27187 ExecStart=/usr/lib/pscheduler/daemons/ticker --daemon --pid-file /var/run/pscheduler-server/ticker/pid --dsn @/et

  Process: 27178 ExecStartPre=/bin/sh -c if [ -r /etc/pscheduler/daemons/ticker.conf ]; then opts=$(sed -e 's/#.*$//' /etc/pschedu

  Process: 27177 ExecStartPre=/bin/mv /var/run/pscheduler-server/ticker/pid.build /var/run/pscheduler-server/ticker/pid (code=exit

  Process: 27176 ExecStartPre=/bin/chown pscheduler:pscheduler /var/run/pscheduler-server/ticker/pid.build (code=exited, status=0/

  Process: 27175 ExecStartPre=/usr/bin/touch -f /var/run/pscheduler-server/ticker/pid.build (code=exited, status=0/SUCCESS)

  Process: 27174 ExecStartPre=/bin/rm -f /var/run/pscheduler-server/ticker/pid.build (code=exited, status=0/SUCCESS)

  Process: 27173 ExecStartPre=/bin/chown pscheduler:pscheduler /var/run/pscheduler-server/ticker/tmp (code=exited, status=0/SUCCES

  Process: 27172 ExecStartPre=/bin/chmod 700 /var/run/pscheduler-server/ticker/tmp (code=exited, status=0/SUCCESS)

  Process: 27171 ExecStartPre=/bin/mkdir -p /var/run/pscheduler-server/ticker/tmp (code=exited, status=0/SUCCESS)

  Process: 27170 ExecStartPre=/bin/chmod 755 /var/run/pscheduler-server/ticker (code=exited, status=0/SUCCESS)

  Process: 27166 ExecStartPre=/bin/chown pscheduler:pscheduler /var/run/pscheduler-server/ticker (code=exited, status=0/SUCCESS)

  Process: 27158 ExecStartPre=/bin/mkdir -p /var/run/pscheduler-server/ticker (code=exited, status=0/SUCCESS)

 Main PID: 27187 (code=exited, status=1/FAILURE)

Upon further inspecting the pscheduler.log I found the following - 

$ tail -n 20 pscheduler.log

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR    Traceback (most recent call last):

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR      File "/usr/lib/python3/dist-packages/pscheduler/saferun.py", line 76, in safe_run

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR        function()

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR      File "/usr/lib/pscheduler/daemons/ticker", line 170, in <lambda>

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR        pscheduler.safe_run(lambda: main_program())

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR      File "/usr/lib/pscheduler/daemons/ticker", line 132, in main_program

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR        cursor.execute("SELECT cold_boot()")

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR    psycopg2.InternalError: AttributeError: module 'jsonschema' has no attribute 'Draft7Validator'

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR    CONTEXT:  Traceback (most recent call last):

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR      PL/Python function "json_validate", line 17, in <module>

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR        "required": [ "" ]

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR      PL/Python function "json_validate", line 1411, in json_validate

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR    PL/Python function "json_validate"

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR    PL/pgSQL function test_boot() line 35 at assignment

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR    SQL statement "SELECT test_boot()"

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR    PL/pgSQL function warm_boot() line 4 at PERFORM

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR    SQL statement "SELECT warm_boot()"

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR    PL/pgSQL function cold_boot() line 4 at PERFORM

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR    Waiting 0.25 seconds before restarting

Jul 28 13:02:39 dtn098 safe_run/ticker ERROR    Restarting: ['/usr/lib/pscheduler/daemons/ticker', '--daemon', '--pid-file', '/var/run/pscheduler-server/ticker/pid', '--dsn', '@/etc/pscheduler/database/database-dsn']

It seems like there's an issue with a python dependency. Would the best way to fix this be to upgrade the jsonschema module with  "pip install --upgrade jsonschema" or something else?

Kind Regards,

Prannoy SABLOK

Technical Specialist

Singapore Advanced Research and Education Network (SingAREN)

    

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