[kepler-users] Kepler and multiple instances in nogui mode - failing

[Daniel Crawl]

Hi Michal,

You can start the HSQL servers before you execute the workflows. To do
this, all the databases need to be configured to use a server instead
of directly accessing the file. By default, the databases for the
cache and core use a server, but not for provenance. To make the
provenance database use a server, update configuration.xml in the
provenance module so that DB Host is set to localhost. More information
on configuring the databases can be found here:

https://kepler-project.org/developers/reference/accessing-hsql/

To start the servers:

kepler.sh -hsql start

After the workflows finish execution, you can stop the servers:

kepler.sh -hsql stop

It looks like the location of KeplerData and .kepler can be changed by
setting $HOME, but I have not exhaustively tested this.

   --dan


On 5/22/12 2:24 AM, Michal Owsiak wrote:
> Hello Kepler team,
>
> I have following issue.
>
> I'd like to run multiple instances of the workflow at the same time.
> However, this execution mode fails.
>
> I am attaching simple workflow (simple_workflow.xml)
>
> I am starting it following way:
>
> --- CUT start_workflow.sh ---
> #!/bin/bash
> $KEPLER/kepler.sh -runwf -nogui -nocache simple_workflow.xml &
> $KEPLER/kepler.sh -runwf -nogui -nocache simple_workflow.xml &
> $KEPLER/kepler.sh -runwf -nogui -nocache simple_workflow.xml &
> $KEPLER/kepler.sh -runwf -nogui -nocache simple_workflow.xml &
> --- CUT ---
>
> If you try to execute it in multiple parallel instances, you will
> receive errors similar to what I have:
>
> [null] 980 ms. Memory: 493632K Free: 479782K (97%)
> [null] java.sql.SQLException: File input/output error:
> /Users/owsiak/KeplerData/modules/core/coreDB.script.new
> [null] at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
> ...
> ...
> ...
> ...
> [null] Command failed: ptolemy.kernel.util.IllegalActionException:
> RecordingException: Error generating new LSID for workflow execution : null
> [null] in .simple_workflow.TOP Provenance Recorder
> [null] ptolemy.kernel.util.IllegalActionException: RecordingException:
> Error generating new LSID for workflow execution : null
> [null] in .simple_workflow.TOP Provenance Recorder
> [null] at
> org.kepler.provenance.ProvenanceRecorder.preinitialize(ProvenanceRecorder.java:605)
>
>
>
> Question: is it possible to run multiple instances of the Kepler at the
> same time? How can one achieve that?
>
> Question 2: is it possible to use database in server mode? How can I
> prepare this kind of setup?
>
> Question 3: is it possible to change location of "KeplerData" and
> ".kepler" for each running Kepler process?
>
> Thanks in advance for the support
>
> Cheers
>
> Michal
>
>
>
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