how do i add multiple attributes as correlation attributes for merge content

[#1]

Hi All,

i have a merge content processor, which i want to merge incoming flowfiles based on the value of 2 attributes (suppose 'xx' and 'yy'.

and i set the attribute strategy to 'keep only common attributes'. and i specified the correlation attributes as ( xx,yy).

but i keep getting scenarios where the flowfiles having different attributes of either xx or yy are being merged together and elimating those attributes because of the attribute strategy.

how do i config the processor to achieve what i a looking for (please mention syntax also, great help)? can there be only one correlation attributes?

Regards

Pavan

[#2 · Accepted solution]

Before MergeContent you can put an UpdateAttribute processor and create a new attribute "xx_yy" with the value of ${xx}_${yy} then in MergeContent put xx_yy as the correlation attribute.

[#3]

i understand that possibility or we can use 2 merge content processors back to back one for each attribute.

but will it be possible to use those 2 attributes separately in the same processor?

thanks for the response.

[#4]

The Correlation Attribute property is the name of one attribute, so if you want to correlate on two attributes you need to make a new attribute that is the combined value of the two attributes, or do the back to back merge as you mentioned.