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--- kb:apache_nifi [2018/02/05 11:53] – [Create Processor] yehuda
+++ kb:apache_nifi [2022/01/03 16:03] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 ====== Apache NiFi ======
+[[https://community.hortonworks.com/articles/75032/executescript-cookbook-part-1.html|Script processor JYthon NIFI]]
+Community: [[http://webchat.freenode.net/?channels=#nifi|irc]] [[https://www.hipchat.com/gzh2m5YML|hipchat]]
+====== KB ======
+<code>
+-- cursh handling
+[4:26 PM] Joe Witt: set that to
+[4:26 PM] Joe Witt: nifi.flowcontroller.autoResumeState=false
+[4:26 PM] Joe Witt: then you can fix/change whatever is going into a hung thread state mode
+[4:27 PM] Joe Witt: in latest release (or maybe in the next release?) you can kill hung processors too
+[4:27 PM] Joe Witt: that wil let you fix things and restart them as well
+[4:27 PM] Joe Witt: that is new or about to be released
+</code>
 ====== Create Processor ======
 <code bash>
@@ Line 13: / Line 25: @@
 https://nifi.apache.org/developer-guide.html
+https://github.com/alefbt/NiFi-Rule-engine-processor
+executescript-cookbook: [[https://community.hortonworks.com/articles/75032/executescript-cookbook-part-1.html|part-1]], [[https://community.hortonworks.com/articles/75545/executescript-cookbook-part-2.html|part-2]], [[https://community.hortonworks.com/articles/77739/executescript-cookbook-part-3.html|part-3]]
+<code python>
+'''
+Created on May 6, 2018
+@author: yehuda
+'''
+from org.apache.commons.io import IOUtils
+from java.nio.charset import StandardCharsets
+from org.apache.nifi.processor.io import OutputStreamCallback, InputStreamCallback
+import json
+class InputStreamCB(InputStreamCallback):
+    def __init__(self):
+        self.items = []
+        pass
+    def process(self, inputStream):
+        text = IOUtils.toString(inputStream, StandardCharsets.UTF_8)
+        d = json.loads(text)
+        collection_name = "messages"
+        c = "source , batch".split(",")
+        collect_to_attach = map(lambda x: x.strip(), c)
+        attach_data = {}
+        for aitem in collect_to_attach:
+            if aitem in d:
+                attach_data[aitem] = d[aitem]
+        col_name_parts = collection_name.split(".")
+        #
+        # Filter
+        #
+        selected_obj = d
+        for col_name_part in col_name_parts:
+            if col_name_part in selected_obj:
+                selected_obj = selected_obj[col_name_part]
+        #
+        # Enreach item
+        #
+        out = []
+        for item in selected_obj:
+            m = dict()
+            m.update(item)
+            m.update(attach_data)
+            out.append(m)
+            # SAVE AS NEW FLOW FILE
+        self.items = out
+    def getItems(self):
+        return self.items
+class OutputStreamCB(OutputStreamCallback):
+    def __init__(self):
+        pass
+    def setItem(self,i):
+        self.item = i
+    def process(self, outputStream):
+        str_out = json.dumps(self.item)
+        outputStream.write(bytearray(str_out.encode('utf-8')))
+ff = session.get()
+if ff != None:
+    isCB = InputStreamCB()
+    session.read(ff, isCB)
+    counter = 1
+    for itm in isCB.getItems():
+        itm_ff = session.create(ff)
+        outCB = OutputStreamCB()
+        outCB.setItem(itm)
+        itm_ff = session.write(itm_ff, outCB)
+        session.transfer(itm_ff, REL_SUCCESS)
+    session.transfer(ff, REL_FAILURE)
+</code>

kb/apache_nifi.1517831617.txt.gz · Last modified: 2022/01/03 16:03 (external edit)

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