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NiFi Example: How to Put/Get to/from a DistributedCache

Left part: Put

Set values you'd like to cache to the content of a FlowFile. Then pass it to PutDistributedCache.

Right part: Get

You can enrich incoming FlowFiles by adding an attribute with a value fetched from DistributedCache.

<?xml version="1.0" ?>
<template encoding-version="1.0">
<description></description>
<groupId>016ccfde-015a-1000-95c4-d82dda5e14e0</groupId>
<name>DistributedCache Put/Fetch example</name>
<snippet>
<processGroups>
<id>36bf253f-015a-1000-0000-000000000000</id>
<parentGroupId>016ccfde-015a-1000-0000-000000000000</parentGroupId>
<position>
<x>0.0</x>
<y>0.0</y>
</position>
<comments></comments>
<contents>
<connections>
<id>015a1001-3219-16c0-0000-000000000000</id>
<parentGroupId>36bf253f-015a-1000-0000-000000000000</parentGroupId>
<backPressureDataSizeThreshold>1 GB</backPressureDataSizeThreshold>
<backPressureObjectThreshold>10000</backPressureObjectThreshold>
<destination>
<groupId>36bf253f-015a-1000-0000-000000000000</groupId>
<id>36c074e8-015a-1000-0000-000000000000</id>
<type>PROCESSOR</type>
</destination>
<flowFileExpiration>0 sec</flowFileExpiration>
<labelIndex>1</labelIndex>
<name></name>
<selectedRelationships>success</selectedRelationships>
<source>
<groupId>36bf253f-015a-1000-0000-000000000000</groupId>
<id>015a1000-3219-16c0-0000-000000000000</id>
<type>PROCESSOR</type>
</source>
<zIndex>0</zIndex>
</connections>
<connections>
<id>015a1002-3219-16c0-0000-000000000000</id>
<parentGroupId>36bf253f-015a-1000-0000-000000000000</parentGroupId>
<backPressureDataSizeThreshold>1 GB</backPressureDataSizeThreshold>
<backPressureObjectThreshold>10000</backPressureObjectThreshold>
<destination>
<groupId>36bf253f-015a-1000-0000-000000000000</groupId>
<id>36c08c68-015a-1000-0000-000000000000</id>
<type>PROCESSOR</type>
</destination>
<flowFileExpiration>0 sec</flowFileExpiration>
<labelIndex>1</labelIndex>
<name></name>
<selectedRelationships>success</selectedRelationships>
<source>
<groupId>36bf253f-015a-1000-0000-000000000000</groupId>
<id>36c074e8-015a-1000-0000-000000000000</id>
<type>PROCESSOR</type>
</source>
<zIndex>0</zIndex>
</connections>
<connections>
<id>36c0450a-015a-1000-0000-000000000000</id>
<parentGroupId>36bf253f-015a-1000-0000-000000000000</parentGroupId>
<backPressureDataSizeThreshold>1 GB</backPressureDataSizeThreshold>
<backPressureObjectThreshold>10000</backPressureObjectThreshold>
<destination>
<groupId>36bf253f-015a-1000-0000-000000000000</groupId>
<id>36bfa7fc-015a-1000-0000-000000000000</id>
<type>PROCESSOR</type>
</destination>
<flowFileExpiration>0 sec</flowFileExpiration>
<labelIndex>1</labelIndex>
<name></name>
<selectedRelationships>success</selectedRelationships>
<source>
<groupId>36bf253f-015a-1000-0000-000000000000</groupId>
<id>36c03219-015a-1000-0000-000000000000</id>
<type>PROCESSOR</type>
</source>
<zIndex>0</zIndex>
</connections>
<controllerServices>
<id>36bf7056-015a-1000-0000-000000000000</id>
<parentGroupId>36bf253f-015a-1000-0000-000000000000</parentGroupId>
<comments></comments>
<descriptors>
<entry>
<key>Server Hostname</key>
<value>
<name>Server Hostname</name>
</value>
</entry>
<entry>
<key>Server Port</key>
<value>
<name>Server Port</name>
</value>
</entry>
<entry>
<key>SSL Context Service</key>
<value>
<identifiesControllerService>org.apache.nifi.ssl.SSLContextService</identifiesControllerService>
<name>SSL Context Service</name>
</value>
</entry>
<entry>
<key>Communications Timeout</key>
<value>
<name>Communications Timeout</name>
</value>
</entry>
</descriptors>
<name>DistributedMapCacheClientService</name>
<properties>
<entry>
<key>Server Hostname</key>
<value>localhost</value>
</entry>
<entry>
<key>Server Port</key>
</entry>
<entry>
<key>SSL Context Service</key>
</entry>
<entry>
<key>Communications Timeout</key>
</entry>
</properties>
<state>ENABLED</state>
<type>org.apache.nifi.distributed.cache.client.DistributedMapCacheClientService</type>
</controllerServices>
<processors>
<id>015a1000-3219-16c0-0000-000000000000</id>
<parentGroupId>36bf253f-015a-1000-0000-000000000000</parentGroupId>
<position>
<x>794.0000109406199</x>
<y>238.00000101055775</y>
</position>
<config>
<bulletinLevel>WARN</bulletinLevel>
<comments></comments>
<concurrentlySchedulableTaskCount>1</concurrentlySchedulableTaskCount>
<descriptors>
<entry>
<key>File Size</key>
<value>
<name>File Size</name>
</value>
</entry>
<entry>
<key>Batch Size</key>
<value>
<name>Batch Size</name>
</value>
</entry>
<entry>
<key>Data Format</key>
<value>
<name>Data Format</name>
</value>
</entry>
<entry>
<key>Unique FlowFiles</key>
<value>
<name>Unique FlowFiles</name>
</value>
</entry>
<entry>
<key>generate-ff-custom-text</key>
<value>
<name>generate-ff-custom-text</name>
</value>
</entry>
</descriptors>
<executionNode>ALL</executionNode>
<lossTolerant>false</lossTolerant>
<penaltyDuration>30 sec</penaltyDuration>
<properties>
<entry>
<key>File Size</key>
<value>0B</value>
</entry>
<entry>
<key>Batch Size</key>
<value>1</value>
</entry>
<entry>
<key>Data Format</key>
<value>Text</value>
</entry>
<entry>
<key>Unique FlowFiles</key>
<value>false</value>
</entry>
<entry>
<key>generate-ff-custom-text</key>
</entry>
</properties>
<runDurationMillis>0</runDurationMillis>
<schedulingPeriod>1d</schedulingPeriod>
<schedulingStrategy>TIMER_DRIVEN</schedulingStrategy>
<yieldDuration>1 sec</yieldDuration>
</config>
<name>GenerateFlowFile</name>
<relationships>
<autoTerminate>false</autoTerminate>
<name>success</name>
</relationships>
<style></style>
<type>org.apache.nifi.processors.standard.GenerateFlowFile</type>
</processors>
<processors>
<id>36bfa7fc-015a-1000-0000-000000000000</id>
<parentGroupId>36bf253f-015a-1000-0000-000000000000</parentGroupId>
<position>
<x>276.3153185578074</x>
<y>564.6436777683703</y>
</position>
<config>
<bulletinLevel>WARN</bulletinLevel>
<comments></comments>
<concurrentlySchedulableTaskCount>1</concurrentlySchedulableTaskCount>
<descriptors>
<entry>
<key>Cache Entry Identifier</key>
<value>
<name>Cache Entry Identifier</name>
</value>
</entry>
<entry>
<key>Distributed Cache Service</key>
<value>
<identifiesControllerService>org.apache.nifi.distributed.cache.client.DistributedMapCacheClient</identifiesControllerService>
<name>Distributed Cache Service</name>
</value>
</entry>
<entry>
<key>Cache update strategy</key>
<value>
<name>Cache update strategy</name>
</value>
</entry>
<entry>
<key>Max cache entry size</key>
<value>
<name>Max cache entry size</name>
</value>
</entry>
</descriptors>
<executionNode>ALL</executionNode>
<lossTolerant>false</lossTolerant>
<penaltyDuration>30 sec</penaltyDuration>
<properties>
<entry>
<key>Cache Entry Identifier</key>
<value>some-cache-key-${hostname()}</value>
</entry>
<entry>
<key>Distributed Cache Service</key>
<value>36bf7056-015a-1000-0000-000000000000</value>
</entry>
<entry>
<key>Cache update strategy</key>
<value>replace</value>
</entry>
<entry>
<key>Max cache entry size</key>
<value>1 MB</value>
</entry>
</properties>
<runDurationMillis>0</runDurationMillis>
<schedulingPeriod>0 sec</schedulingPeriod>
<schedulingStrategy>TIMER_DRIVEN</schedulingStrategy>
<yieldDuration>1 sec</yieldDuration>
</config>
<name>PutDistributedMapCache</name>
<relationships>
<autoTerminate>true</autoTerminate>
<name>failure</name>
</relationships>
<relationships>
<autoTerminate>true</autoTerminate>
<name>success</name>
</relationships>
<style></style>
<type>org.apache.nifi.processors.standard.PutDistributedMapCache</type>
</processors>
<processors>
<id>36c03219-015a-1000-0000-000000000000</id>
<parentGroupId>36bf253f-015a-1000-0000-000000000000</parentGroupId>
<position>
<x>277.0000109406199</x>
<y>297.00000101055775</y>
</position>
<config>
<bulletinLevel>WARN</bulletinLevel>
<comments></comments>
<concurrentlySchedulableTaskCount>1</concurrentlySchedulableTaskCount>
<descriptors>
<entry>
<key>File Size</key>
<value>
<name>File Size</name>
</value>
</entry>
<entry>
<key>Batch Size</key>
<value>
<name>Batch Size</name>
</value>
</entry>
<entry>
<key>Data Format</key>
<value>
<name>Data Format</name>
</value>
</entry>
<entry>
<key>Unique FlowFiles</key>
<value>
<name>Unique FlowFiles</name>
</value>
</entry>
<entry>
<key>generate-ff-custom-text</key>
<value>
<name>generate-ff-custom-text</name>
</value>
</entry>
</descriptors>
<executionNode>ALL</executionNode>
<lossTolerant>false</lossTolerant>
<penaltyDuration>30 sec</penaltyDuration>
<properties>
<entry>
<key>File Size</key>
<value>0B</value>
</entry>
<entry>
<key>Batch Size</key>
<value>1</value>
</entry>
<entry>
<key>Data Format</key>
<value>Text</value>
</entry>
<entry>
<key>Unique FlowFiles</key>
<value>false</value>
</entry>
<entry>
<key>generate-ff-custom-text</key>
<value>cached-value-${now()}</value>
</entry>
</properties>
<runDurationMillis>0</runDurationMillis>
<schedulingPeriod>1d</schedulingPeriod>
<schedulingStrategy>TIMER_DRIVEN</schedulingStrategy>
<yieldDuration>1 sec</yieldDuration>
</config>
<name>GenerateFlowFile</name>
<relationships>
<autoTerminate>false</autoTerminate>
<name>success</name>
</relationships>
<style></style>
<type>org.apache.nifi.processors.standard.GenerateFlowFile</type>
</processors>
<processors>
<id>36c074e8-015a-1000-0000-000000000000</id>
<parentGroupId>36bf253f-015a-1000-0000-000000000000</parentGroupId>
<position>
<x>785.0000109406199</x>
<y>441.00000101055775</y>
</position>
<config>
<bulletinLevel>WARN</bulletinLevel>
<comments></comments>
<concurrentlySchedulableTaskCount>1</concurrentlySchedulableTaskCount>
<descriptors>
<entry>
<key>Cache Entry Identifier</key>
<value>
<name>Cache Entry Identifier</name>
</value>
</entry>
<entry>
<key>Distributed Cache Service</key>
<value>
<identifiesControllerService>org.apache.nifi.distributed.cache.client.DistributedMapCacheClient</identifiesControllerService>
<name>Distributed Cache Service</name>
</value>
</entry>
<entry>
<key>Put Cache Value In Attribute</key>
<value>
<name>Put Cache Value In Attribute</name>
</value>
</entry>
<entry>
<key>Max Length To Put In Attribute</key>
<value>
<name>Max Length To Put In Attribute</name>
</value>
</entry>
<entry>
<key>Character Set</key>
<value>
<name>Character Set</name>
</value>
</entry>
</descriptors>
<executionNode>ALL</executionNode>
<lossTolerant>false</lossTolerant>
<penaltyDuration>30 sec</penaltyDuration>
<properties>
<entry>
<key>Cache Entry Identifier</key>
<value>some-cache-key-${hostname()}</value>
</entry>
<entry>
<key>Distributed Cache Service</key>
<value>36bf7056-015a-1000-0000-000000000000</value>
</entry>
<entry>
<key>Put Cache Value In Attribute</key>
<value>cached-value</value>
</entry>
<entry>
<key>Max Length To Put In Attribute</key>
<value>256</value>
</entry>
<entry>
<key>Character Set</key>
<value>UTF-8</value>
</entry>
</properties>
<runDurationMillis>0</runDurationMillis>
<schedulingPeriod>0 sec</schedulingPeriod>
<schedulingStrategy>TIMER_DRIVEN</schedulingStrategy>
<yieldDuration>1 sec</yieldDuration>
</config>
<name>FetchDistributedMapCache</name>
<relationships>
<autoTerminate>true</autoTerminate>
<name>failure</name>
</relationships>
<relationships>
<autoTerminate>true</autoTerminate>
<name>not-found</name>
</relationships>
<relationships>
<autoTerminate>false</autoTerminate>
<name>success</name>
</relationships>
<style></style>
<type>org.apache.nifi.processors.standard.FetchDistributedMapCache</type>
</processors>
<processors>
<id>36c08c68-015a-1000-0000-000000000000</id>
<parentGroupId>36bf253f-015a-1000-0000-000000000000</parentGroupId>
<position>
<x>792.9956774445261</x>
<y>672.4080820652453</y>
</position>
<config>
<bulletinLevel>WARN</bulletinLevel>
<comments></comments>
<concurrentlySchedulableTaskCount>1</concurrentlySchedulableTaskCount>
<descriptors>
<entry>
<key>Delete Attributes Expression</key>
<value>
<name>Delete Attributes Expression</name>
</value>
</entry>
<entry>
<key>Store State</key>
<value>
<name>Store State</name>
</value>
</entry>
<entry>
<key>Stateful Variables Initial Value</key>
<value>
<name>Stateful Variables Initial Value</name>
</value>
</entry>
</descriptors>
<executionNode>ALL</executionNode>
<lossTolerant>false</lossTolerant>
<penaltyDuration>30 sec</penaltyDuration>
<properties>
<entry>
<key>Delete Attributes Expression</key>
</entry>
<entry>
<key>Store State</key>
<value>Do not store state</value>
</entry>
<entry>
<key>Stateful Variables Initial Value</key>
</entry>
</properties>
<runDurationMillis>0</runDurationMillis>
<schedulingPeriod>0 sec</schedulingPeriod>
<schedulingStrategy>TIMER_DRIVEN</schedulingStrategy>
<yieldDuration>1 sec</yieldDuration>
</config>
<name>UpdateAttribute</name>
<relationships>
<autoTerminate>false</autoTerminate>
<name>success</name>
</relationships>
<style></style>
<type>org.apache.nifi.processors.attributes.UpdateAttribute</type>
</processors>
</contents>
<name>DistributedCache Put/Fetch example</name>
</processGroups>
</snippet>
<timestamp>02/13/2017 18:18:39 JST</timestamp>
</template>
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