[kepler-dev] [Bug 5444] Kepler can't run workflow if two instances exist at same time

[bugzilla-daemon at ecoinformatics.org]

http://bugzilla.ecoinformatics.org/show_bug.cgi?id=5444

--- Comment #14 from Daniel Crawl <crawl at sdsc.edu> 2012-07-11 14:53:49 PDT ---
There are 3 different problems in this bug.

The problem in the original description is that 2 Kepler are started, the first
is closed, and then the second gets an error. As described in comment 7, you
can get around this by starting the HSQL servers separately from Kepler.

The problem in comment 5 is due to running different suites at the same time.
To reproduce:

1. ant change-to -Dsuite=reporting
2. ant run
3. in a different window, ant change-to -Dsuite=kepler
4. ant run
5. drag anything from the actor tree on the canvas

When Kepler is run with a different suite, ~/.kepler/ is deleted. This deletes
the cached objects on the file system, but if another Kepler is running, the
cache database is not deleted since it is in memory. The exception is due to
the inconsistency between the contents of the database and file system.

The problem in comment 13 is due to multiple Kepler instances trying to access
the HSQL provenance database. On 2011-07-19 this database configured to
directly access the files to increase performance. If you want to run multiple
instances, you'll need to configure it to use server-mode; see
https://kepler-project.org/developers/reference/accessing-hsql.

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