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https://issues.apache.org/jira/browse/MINIFICPP-2020?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ferenc Gerlits reassigned MINIFICPP-2020:
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Assignee: (was: Ferenc Gerlits)
> Fix the code which is supposed to stop two MiNiFi instances from interfering
> with each other
> --------------------------------------------------------------------------------------------
>
> Key: MINIFICPP-2020
> URL: https://issues.apache.org/jira/browse/MINIFICPP-2020
> Project: Apache NiFi MiNiFi C++
> Issue Type: Bug
> Reporter: Ferenc Gerlits
> Priority: Minor
> Fix For: 0.14.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> On Windows,
> * (x) if MiNiFi is already running as a service and you try to start another
> instance from the console, then the second instance will exit with
> %errorlevel% == -1, but without any message printed to either the console or
> the log file, because GetTerminationEventHandle returns a null pointer;
> * (/) if MiNiFi is not running as a service, you can start up two instances
> with different MINIFI_HOMES from the console;
> * (?) if you start up a MiNiFi instance from the console, then you start the
> MiNiFi service, that works (assuming their MINIFI_HOMEs are different).
> On Linux,
> * (/) you can start up two instances as long as their MINIFI_HOMEs are
> different.
> On both,
> * (?) if you try to start up two MiNiFi instances with the same MINIFI_HOME,
> it will fail, as long as some repositories are RocksDB, because RocksDB can't
> open the repo if another process has it open already.
>
> In theory, the process semaphore should stop the last case before trying to
> open the DBs, but it doesn't, because we open the semaphore in non-exclusive
> mode. Opening the process semaphore in exclusive mode (with no other
> changes) would be a bad solution, because in the case of a crash or a kill
> signal, the stale semaphore would stop the user from starting a new MiNiFi
> instance and would have to be removed manually.
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