You can execute any shell script using ExecuteProcess Processor in Nifi. For example I have a very simple shell script below which writes "Hello world" to a file. ... View more

For non-SSL enabled NiFi below should work: curl --tlsv1.2 -i -H 'Content-Type: application/json' -XPUT -d '{"id":"cdb54c9a-0158-1000-5566-c45ca9692f85","state":"RUNNING"}' localhost:8080/nifi-api/flow/process-groups/cdb54c9a-0158-1000-5566-c45ca9692f85 Start Process Group for SSL enabled NiFi : Generate access token: [root@nifi-ambari-01 ~]# curl --tlsv1.2 https://000.00.00.000:9091/nifi-api/access/token --data 'username=awadhwani&password=password' -k O/P: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJjbj1BcnRpIFdhZGh3YW5pLG91PVBlb3BsZSxkYz1zbWUsZGM9aHd4IiwiaXNzIjoiTGRhcFByb3ZpZGVyIiwiYXVkIjoiTGRhcFByb3ZpZGVyIiwicHJlZmVycmVkX3VzZXJuYW1lIjoiQXJ0aSBXYWRod2FuaSIsImtpZCI6MywiZXhwIjoxNDg5MjMyNDQyLCJpYXQiOjE0ODkxODkyNDJ9.17iHL3XX7Bw6dXv5lCByimu_asQOaSwW11o2IQEFO0s[root@nifi-ambari-01~]# Start PG by passing the above access token [root@nifi-ambari-01 ~]# curl --tlsv1.2 -ik -H 'Content-Type: application/json' -H 'Authorization: Bearer eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJjbj1BcnRpIFdhZGh3YW5pLG91PVBlb3BsZSxkYz1zbWUsZGM9aHd4IiwiaXNzIjoiTGRhcFByb3ZpZGVyIiwiYXVkIjoiTGRhcFByb3ZpZGVyIiwicHJlZmVycmVkX3VzZXJuYW1lIjoiQXJ0aSBXYWRod2FuaSIsImtpZCI6MywiZXhwIjoxNDg5MjMyNDQyLCJpYXQiOjE0ODkxODkyNDJ9.17iHL3XX7Bw6dXv5lCByimu_asQOaSwW11o2IQEFO0s' -XPUT -d '{"id":"2f092b07-0157-1000-0000-00005f526fbc","state":"RUNNING"}' https://000.00.00.000:9091/nifi-api/flow/process-groups/2f092b07-0157-1000-0000-00005f526fbc O/P: HTTP/1.1 200 OKDate: Fri, 10 Mar 2017 23:42:14 GMTServer: Jetty(9.3.9.v20160517)Cache-Control: private, no-cache, no-store, no-transformX-ProxiedEntitiesAccepted: trueDate: Fri, 10 Mar 2017 23:42:14 GMTContent-Type: application/jsonContent-Length: 63{"id":"2f092b07-0157-1000-0000-00005f526fbc","state":"RUNNING"}[root@nifi-ambari-01 ~]# Earlier before starting: After starting: Stop process Group for SSL enabled NiFi : (use the same token generated above) [root@nifi-ambari-01 ~]# curl --tlsv1.2 -ik -H 'Content-Type: application/json' -H 'Authorization: Bearer eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJjbj1BcnRpIFdhZGh3YW5pLG91PVBlb3BsZSxkYz1zbWUsZGM9aHd4IiwiaXNzIjoiTGRhcFByb3ZpZGVyIiwiYXVkIjoiTGRhcFByb3ZpZGVyIiwicHJlZmVycmVkX3VzZXJuYW1lIjoiQXJ0aSBXYWRod2FuaSIsImtpZCI6MywiZXhwIjoxNDg5MjMyNDQyLCJpYXQiOjE0ODkxODkyNDJ9.17iHL3XX7Bw6dXv5lCByimu_asQOaSwW11o2IQEFO0s' -XPUT -d '{"id":"2f092b07-0157-1000-0000-00005f526fbc","state":"STOPPED"}' https://000.00.00.000:9091/nifi-api/flow/process-groups/2f092b07-0157-1000-0000-00005f526fbc HTTP/1.1 200 OKDate: Fri, 10 Mar 2017 23:42:46 GMTServer: Jetty(9.3.9.v20160517)Cache-Control: private, no-cache, no-store, no-transformX-ProxiedEntitiesAccepted: trueDate: Fri, 10 Mar 2017 23:42:46 GMTContent-Type: application/jsonContent-Length: 63{"id":"2f092b07-0157-1000-0000-00005f526fbc","state":"STOPPED"}[root@nifi-ambari-01 ~] Earlier before stopping: After stopping: ... View more

While designing your flow, one will think of handling failures as well. Some may ignore (terminate) it while some may want to analyze their failed flow files. You can view/download any flowfile in the connection via NiFi UI. However if there are multiple flowfiles then this becomes little tedious since you have to do it for each flowfile. . In that case, I used below flow to put all failed flow files to a temp location on my nifi node and then access it from there for further analysis. In this I am generating random 2B text file and passing it to FTP server. If FTP server is unreachable it will put all flow files to failure/reject queue. You can list all files in this queue. I have viewed one such file in image below. Then all these files are passed to PutFile processor which is configured to write all the files it receives to /tmp/test location on the nifi node. Please note: There could be multiple ways to do this. This is the approach used by me to quickly download all failed flow files in my flow. download-failed-flowfiles-2.png download-failed-flowfiles-3.png download-failed-flowfiles-4.png download-failed-flowfiles-5.png ... View more

Using NiFi REST API for unsecured cluster is straight-forward like below: [root@<nifi-host> ~]# curl -v -X GET http://<nifi-host>:<port>/nifi-api/flow/current-user * About to connect() to <nifi-host> port <port> (#0) * Trying <IP address>... * Connected to <nifi-host> (<IP address>) port <port> (#0) > GET /nifi-api/flow/current-user HTTP/1.1 > User-Agent: curl/7.29.0 > Host: <nifi-host>:<port> > Accept: */* > < HTTP/1.1 200 OK < Date: Fri, 30 Jun 2017 22:15:09 GMT < X-Frame-Options: SAMEORIGIN < X-Frame-Options: SAMEORIGIN < X-Frame-Options: SAMEORIGIN < Cache-Control: private, no-cache, no-store, no-transform < Server: Jetty(9.4.3.v20170317) < Vary: Accept-Encoding, User-Agent < Date: Fri, 30 Jun 2017 22:15:09 GMT < Date: Fri, 30 Jun 2017 22:15:09 GMT < Content-Type: application/json < Content-Length: 439 < * Connection #0 to host <nifi-host> left intact {"identity":"anonymous","anonymous":true,"provenancePermissions":{"canRead":true,"canWrite":true},"countersPermissions":{"canRead":true,"canWrite":true},"tenantsPermissions":{"canRead":true,"canWrite":true},"controllerPermissions":{"canRead":true,"canWrite":true},"policiesPermissions":{"canRead":true,"canWrite":true},"systemPermissions":{"canRead":true,"canWrite":true},"restrictedComponentsPermissions":{"canRead":true,"canWrite":true}} However if this cluster is using Kerberos for authentication then the curl call will need a Kerberos authentication token as below: First do a kinit (using appropriate keytab/principal) on the nifi node you are logged into. Now get a token using below API call: token=`curl -k -X POST --negotiate -u : https://<nifi-node>:<port>/nifi-api/access/kerberos` Second you need to pass above generated token to the actual API call: curl -k --header "Authorization: Bearer $token" https://<nifi-host>:<port>/nifi-api/flow/cluster/summary ... View more

This is a known issue https://issues.apache.org/jira/browse/NIFI-3800 which is fixed in Apache NiFi 1.2.0 (HDF 2.1.4 and later) Workaround: You can downgrade your Java version to openjdk-1.8.0_121 if you are using something higher than that. ... View more