Thanks Daniel! First option won't work for me since the property is not known to UDF itself, I need to pass it to UDF.
Second option, I won't use pig.properties since the property passed to UDF are per pig script specific, not a global setting. How do I pass a -D option to pig script run (pig -f myscript.pig)? Thanks. On Tue, Nov 23, 2010 at 6:12 PM, Daniel Dai <[email protected]> wrote: > The only hook in frontend for a UDF is outputSchema. You can put your > property into UDFContext in outputSchema, and read back in exec. > > public String exec(Tuple input) throws IOException { > UDFContext context = UDFContext.getUDFContext(); > String a = > context.getUDFProperties(this.getClass()).getProperty("Hello"); > return a; > } > > public Schema outputSchema(Schema input) { > UDFContext context = UDFContext.getUDFContext(); > context.getUDFProperties(this.getClass()).setProperty("Hello", > "World"); > return null; > } > > The other option is to provide a system wide configuration in command line > (-D), or pig.properties, which can be retrieved in UDF.exec using: > UDFContext.getUDFContext().getJobConf().get("propertyname") > > Daniel > > > Dexin Wang wrote: > >> Hi all, >> >> I was reading this: >> >> http://pig.apache.org/docs/r0.7.0/udf.html#Passing+Configurations+to+UDFs >> >> It sounded like I can pass some configuration or context to the UDF but I >> can't figure out how I would do that after I searched quite a bit on >> internet and past discussion. >> >> In my UDF, I can also do this: >> >> UDFContext context = UDFContext.getUDFContext(); >> Properties properties = >> context.getUDFProperties(this.getClass()); >> >> so if the context is set on the front end, supposedly, it will be in that >> properties object. But how do I set it on the front end or whichever way >> to >> pass it to UDF? >> >> Thanks! >> Dexin >> >> > >
