https://community.cloudera.com/t5/Archives-of-Support-Questions/Nifi-ExtractGrok-Processor/m-p/225406#M75112 <P>I've been slowly ramping up with Nifi, and am trying to find some information on the ExtractGrok processor. I can't seem to find any actual examples anywhere on it's use and everything I'm trying is failing.</P><P>Specifically, I can't figure out exactly what to provide for the grok Expression vs the grok Pattern file; they would seem to be the kind of thing you'd provide one or the other but it wants both.</P><P>I'm simply trying to pull a few fields out of a log message (and there may be better ways to do it long term) but I'm really curious about how to make this processor work.</P><P>Does anyone have a real example of it's use I could reference?</P> Wed, 28 Feb 2018 11:46:03 GMT darkdep 2018-02-28T11:46:03Z https://community.cloudera.com/t5/Archives-of-Support-Questions/Nifi-ExtractGrok-Processor/m-p/225406#M75112 <P>I've been slowly ramping up with Nifi, and am trying to find some information on the ExtractGrok processor. I can't seem to find any actual examples anywhere on it's use and everything I'm trying is failing.</P><P>Specifically, I can't figure out exactly what to provide for the grok Expression vs the grok Pattern file; they would seem to be the kind of thing you'd provide one or the other but it wants both.</P><P>I'm simply trying to pull a few fields out of a log message (and there may be better ways to do it long term) but I'm really curious about how to make this processor work.</P><P>Does anyone have a real example of it's use I could reference?</P> Wed, 28 Feb 2018 11:46:03 GMT https://community.cloudera.com/t5/Archives-of-Support-Questions/Nifi-ExtractGrok-Processor/m-p/225406#M75112 darkdep 2018-02-28T11:46:03Z https://community.cloudera.com/t5/Archives-of-Support-Questions/Nifi-ExtractGrok-Processor/m-p/225407#M75113 <P>There is also a GrokReader for record processors, and the additional details docs of that has the default pattern's it uses.</P><P>See the end of this page:</P><P><A href="https://nifi.apache.org/docs/nifi-docs/components/org.apache.nifi/nifi-record-serialization-services-nar/1.5.0/org.apache.nifi.grok.GrokReader/additionalDetails.html" target="_blank">https://nifi.apache.org/docs/nifi-docs/components/org.apache.nifi/nifi-record-serialization-services-nar/1.5.0/org.apache.nifi.grok.GrokReader/additionalDetails.html</A></P> Wed, 28 Feb 2018 23:18:09 GMT https://community.cloudera.com/t5/Archives-of-Support-Questions/Nifi-ExtractGrok-Processor/m-p/225407#M75113 bbende 2018-02-28T23:18:09Z