String concatenation in Oozie expression language

[#1]

Hi,

I'm trying to launch an action if and only if a file exists. I have a decision node with the following case:

${fs:exists(wf:actionData('hdfs-lookup')['outputPath']/2)}

The path I am checking is something like:

hdfs:///mypath/2

and

wf:actionData('hdfs-lookup')['outputPath']

is returning:

hdfs:///mypath

So I'm trying to concatenate this string with '/2'. Is there a way to do this?

I tried with simple quotes, plus operator, .concat, etc but no luck so far.

Thanks!

[#2 · Accepted solution]

Answering my question, I was just not using the concat function correctly... the syntax is:

${fs:exists(concat(wf:actionData('hdfs-lookup')['outputPath'], '/2'))}