flag config about backend_cache never used by sinks

[AlvaroVega]

flag config about backend cache is defined by never usded by sinks (i.e. SQL sinks)

[kumardeepak5]

Hi @AlvaroVega,

can i have more info about flag mentioned in issue? so that i can start with same.
I have tried to find flag (backend_cache) in source code but could not found same flag in source code.

[AlvaroVega]

This is the flag

fiware-cygnus/cygnus-ngsi/src/main/java/com/telefonica/iot/cygnus/sinks/NGSIPostgreSQLSink.java

Lines 117 to 119 in 4bc2a3c

	protected boolean getEnableCache() {
	return enableCache;
	} // getPostgreSQLHost

But I'm not sure it should be removed or just used

[fgalan]

@kumardeepak5 is that flag useful for your use case?

[kumardeepak5]

HI @fgalan
Thanks for your reply.

Below is reply for your query
> is that flag useful for your use case?

I just started to contribute for this open issue.

Further i just investigated in source code & documentation and below are my findings -

1. Same flag is not in use any where although it is mentioned in the docs also.
   Places where it is mentioned are - ngsi-orion-sink and ngsi-postgresql-sink

My Queries-
Is it Planned to use same flag in future? If Yes please let me know the purpose of this flag?
Or is it required to remove same flag from documentation and code?

[fgalan]

Per @AlvaroVega comment

But I'm not sure it should be removed or just used

it seems we are not sure about investing effort in fixing this, specially if no use case is behind it (that's why ask you about it).

Thus, if you don't have a use case for that, I'd suggest to pick another more profitable issue to address.

What do you think?

[kumardeepak5]

I just checked FILE SQLCache File.
It is working as in-memory cache which is not suitable for distributed ENV, so we can allow user to switch On-Off in memory cache in that case.

May be at this place we can use this flag?

[fgalan]

May be at this place we can use this flag?

Ok, go ahead and propose a PR with the fix, please. We would have a look to it. Thanks in advance!