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NiFi example flow which limits number of incoming FlowFiles by Wait and Notify.
Raw
0_README.md

The tricky part is how to setup the initial state in a DistributedMapCache in order to pass the first incoming FlowFile. Currently, Wait/Notify processor doesn't provide a way to do that but you can so by FetchDistributedMapCache.

On the right top of flow, I used GenerateFlowFile and FetchDistributedMapCache to send a FlowFile to Notify, only if there is no existing target cache key. It periodically check and create one if necessary.

On the left side, I simulated incoming FlowFiles those will be queued and processed one by one.

Raw
Using_WaitNotify_to_limit_flow.xml
<?xml version="1.0" ?>
<template encoding-version="1.1">
<description></description>
<groupId>29c27336-015d-1000-3991-b2f025e19832</groupId>
<name>Using WaitNotify to limit flow</name>
<snippet>
<controllerServices>
<id>bd6674a6-3b20-3cdb-0000-000000000000</id>
<parentGroupId>35fe8898-bd57-3b85-0000-000000000000</parentGroupId>
<bundle>
<artifact>nifi-distributed-cache-services-nar</artifact>
<group>org.apache.nifi</group>
<version>1.4.0-SNAPSHOT</version>
</bundle>
<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>
<persistsState>false</persistsState>
<properties>
<entry>
<key>Server Hostname</key>
<value>localhost</value>
</entry>
<entry>
<key>Server Port</key>
<value>4557</value>
</entry>
<entry>
<key>SSL Context Service</key>
</entry>
<entry>
<key>Communications Timeout</key>
<value>30 secs</value>
</entry>
</properties>
<state>ENABLED</state>
<type>org.apache.nifi.distributed.cache.client.DistributedMapCacheClientService</type>
</controllerServices>
<processGroups>
<id>98352fd8-023e-3c2f-0000-000000000000</id>
<parentGroupId>35fe8898-bd57-3b85-0000-000000000000</parentGroupId>
<position>
<x>0.0</x>
<y>0.0</y>
</position>
<comments></comments>
<contents>
<connections>
<id>903f8dd6-6c53-3423-0000-000000000000</id>
<parentGroupId>98352fd8-023e-3c2f-0000-000000000000</parentGroupId>
<backPressureDataSizeThreshold>1 GB</backPressureDataSizeThreshold>
<backPressureObjectThreshold>10000</backPressureObjectThreshold>
<bends>
<x>3335.579345703125</x>
<y>1428.97216796875</y>
</bends>
<destination>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>26899782-7cd2-3c80-0000-000000000000</id>
<type>PROCESSOR</type>
</destination>
<flowFileExpiration>0 sec</flowFileExpiration>
<labelIndex>0</labelIndex>
<name></name>
<selectedRelationships>failure</selectedRelationships>
<source>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>2be98623-184a-309f-0000-000000000000</id>
<type>PROCESSOR</type>
</source>
<zIndex>0</zIndex>
</connections>
<connections>
<id>abfe5efb-f7fd-3bbf-0000-000000000000</id>
<parentGroupId>98352fd8-023e-3c2f-0000-000000000000</parentGroupId>
<backPressureDataSizeThreshold>1 GB</backPressureDataSizeThreshold>
<backPressureObjectThreshold>10000</backPressureObjectThreshold>
<bends>
<x>2556.359619140625</x>
<y>1097.1597900390625</y>
</bends>
<destination>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>08737b4f-305c-38a0-0000-000000000000</id>
<type>PROCESSOR</type>
</destination>
<flowFileExpiration>0 sec</flowFileExpiration>
<labelIndex>0</labelIndex>
<name></name>
<selectedRelationships>success</selectedRelationships>
<source>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>30916515-e4a0-3a26-0000-000000000000</id>
<type>PROCESSOR</type>
</source>
<zIndex>0</zIndex>
</connections>
<connections>
<id>bb02c6d1-fcff-3202-0000-000000000000</id>
<parentGroupId>98352fd8-023e-3c2f-0000-000000000000</parentGroupId>
<backPressureDataSizeThreshold>1 GB</backPressureDataSizeThreshold>
<backPressureObjectThreshold>10000</backPressureObjectThreshold>
<destination>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>26899782-7cd2-3c80-0000-000000000000</id>
<type>PROCESSOR</type>
</destination>
<flowFileExpiration>0 sec</flowFileExpiration>
<labelIndex>0</labelIndex>
<name></name>
<selectedRelationships>success</selectedRelationships>
<source>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>2be98623-184a-309f-0000-000000000000</id>
<type>PROCESSOR</type>
</source>
<zIndex>0</zIndex>
</connections>
<connections>
<id>0c8eb801-8265-35d5-0000-000000000000</id>
<parentGroupId>98352fd8-023e-3c2f-0000-000000000000</parentGroupId>
<backPressureDataSizeThreshold>1 GB</backPressureDataSizeThreshold>
<backPressureObjectThreshold>10000</backPressureObjectThreshold>
<bends>
<x>2349.107666015625</x>
<y>1427.5341796875</y>
</bends>
<destination>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>26899782-7cd2-3c80-0000-000000000000</id>
<type>PROCESSOR</type>
</destination>
<flowFileExpiration>0 sec</flowFileExpiration>
<labelIndex>0</labelIndex>
<name></name>
<selectedRelationships>expired</selectedRelationships>
<selectedRelationships>failure</selectedRelationships>
<source>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>30916515-e4a0-3a26-0000-000000000000</id>
<type>PROCESSOR</type>
</source>
<zIndex>0</zIndex>
</connections>
<connections>
<id>274153bd-dbac-37b7-0000-000000000000</id>
<parentGroupId>98352fd8-023e-3c2f-0000-000000000000</parentGroupId>
<backPressureDataSizeThreshold>1 GB</backPressureDataSizeThreshold>
<backPressureObjectThreshold>10000</backPressureObjectThreshold>
<destination>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>26899782-7cd2-3c80-0000-000000000000</id>
<type>PROCESSOR</type>
</destination>
<flowFileExpiration>0 sec</flowFileExpiration>
<labelIndex>1</labelIndex>
<name></name>
<selectedRelationships>failure</selectedRelationships>
<source>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>08737b4f-305c-38a0-0000-000000000000</id>
<type>PROCESSOR</type>
</source>
<zIndex>0</zIndex>
</connections>
<connections>
<id>37524d8c-19f2-32b8-0000-000000000000</id>
<parentGroupId>98352fd8-023e-3c2f-0000-000000000000</parentGroupId>
<backPressureDataSizeThreshold>1 GB</backPressureDataSizeThreshold>
<backPressureObjectThreshold>10000</backPressureObjectThreshold>
<destination>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>2be98623-184a-309f-0000-000000000000</id>
<type>PROCESSOR</type>
</destination>
<flowFileExpiration>0 sec</flowFileExpiration>
<labelIndex>1</labelIndex>
<name></name>
<selectedRelationships>not-found</selectedRelationships>
<source>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>d8f1feb8-a254-39d9-0000-000000000000</id>
<type>PROCESSOR</type>
</source>
<zIndex>0</zIndex>
</connections>
<connections>
<id>38a46143-9e51-36fa-0000-000000000000</id>
<parentGroupId>98352fd8-023e-3c2f-0000-000000000000</parentGroupId>
<backPressureDataSizeThreshold>1 GB</backPressureDataSizeThreshold>
<backPressureObjectThreshold>10000</backPressureObjectThreshold>
<destination>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>2be98623-184a-309f-0000-000000000000</id>
<type>PROCESSOR</type>
</destination>
<flowFileExpiration>0 sec</flowFileExpiration>
<labelIndex>1</labelIndex>
<name></name>
<selectedRelationships>success</selectedRelationships>
<source>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>08737b4f-305c-38a0-0000-000000000000</id>
<type>PROCESSOR</type>
</source>
<zIndex>0</zIndex>
</connections>
<connections>
<id>3b885f82-7b16-3a11-0000-000000000000</id>
<parentGroupId>98352fd8-023e-3c2f-0000-000000000000</parentGroupId>
<backPressureDataSizeThreshold>1 GB</backPressureDataSizeThreshold>
<backPressureObjectThreshold>10000</backPressureObjectThreshold>
<destination>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>30916515-e4a0-3a26-0000-000000000000</id>
<type>PROCESSOR</type>
</destination>
<flowFileExpiration>0 sec</flowFileExpiration>
<labelIndex>1</labelIndex>
<name></name>
<selectedRelationships>success</selectedRelationships>
<source>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>35ca3968-bad4-3cc0-0000-000000000000</id>
<type>PROCESSOR</type>
</source>
<zIndex>0</zIndex>
</connections>
<connections>
<id>6b5bd100-9448-32c5-0000-000000000000</id>
<parentGroupId>98352fd8-023e-3c2f-0000-000000000000</parentGroupId>
<backPressureDataSizeThreshold>1 GB</backPressureDataSizeThreshold>
<backPressureObjectThreshold>10000</backPressureObjectThreshold>
<destination>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>d8f1feb8-a254-39d9-0000-000000000000</id>
<type>PROCESSOR</type>
</destination>
<flowFileExpiration>0 sec</flowFileExpiration>
<labelIndex>1</labelIndex>
<name></name>
<selectedRelationships>success</selectedRelationships>
<source>
<groupId>98352fd8-023e-3c2f-0000-000000000000</groupId>
<id>d1395405-5ea4-3933-0000-000000000000</id>
<type>PROCESSOR</type>
</source>
<zIndex>0</zIndex>
</connections>
<processors>
<id>d1395405-5ea4-3933-0000-000000000000</id>
<parentGroupId>98352fd8-023e-3c2f-0000-000000000000</parentGroupId>
<position>
<x>3162.1960193502323</x>
<y>699.3454457387926</y>
</position>
<bundle>
<artifact>nifi-standard-nar</artifact>
<group>org.apache.nifi</group>
<version>1.4.0-SNAPSHOT</version>
</bundle>
<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>1 m</schedulingPeriod>
<schedulingStrategy>TIMER_DRIVEN</schedulingStrategy>
<yieldDuration>1 sec</yieldDuration>
</config>
<name>Setup initial state</name>
<relationships>
<autoTerminate>false</autoTerminate>
<name>success</name>
</relationships>
<style></style>
<type>org.apache.nifi.processors.standard.GenerateFlowFile</type>
</processors>
<processors>
<id>d8f1feb8-a254-39d9-0000-000000000000</id>
<parentGroupId>98352fd8-023e-3c2f-0000-000000000000</parentGroupId>
<position>
<x>3161.1602283346074</x>
<y>905.6399397573473</y>
</position>
<bundle>
<artifact>nifi-standard-nar</artifact>
<group>org.apache.nifi</group>
<version>1.4.0-SNAPSHOT</version>
</bundle>
<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>functionId</value>
</entry>
<entry>
<key>Distributed Cache Service</key>
<value>bd6674a6-3b20-3cdb-0000-000000000000</value>
</entry>
<entry>
<key>Put Cache Value In Attribute</key>
</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>false</autoTerminate>
<name>not-found</name>
</relationships>
<relationships>
<autoTerminate>true</autoTerminate>
<name>success</name>
</relationships>
<style></style>
<type>org.apache.nifi.processors.standard.FetchDistributedMapCache</type>
</processors>
<processors>
<id>08737b4f-305c-38a0-0000-000000000000</id>
<parentGroupId>98352fd8-023e-3c2f-0000-000000000000</parentGroupId>
<position>
<x>2639.880267397107</x>
<y>905.6399397573473</y>
</position>
<bundle>
<artifact>nifi-standard-nar</artifact>
<group>org.apache.nifi</group>
<version>1.4.0-SNAPSHOT</version>
</bundle>
<config>
<bulletinLevel>WARN</bulletinLevel>
<comments></comments>
<concurrentlySchedulableTaskCount>1</concurrentlySchedulableTaskCount>
<descriptors>
<entry>
<key>Rate Control Criteria</key>
<value>
<name>Rate Control Criteria</name>
</value>
</entry>
<entry>
<key>Maximum Rate</key>
<value>
<name>Maximum Rate</name>
</value>
</entry>
<entry>
<key>Rate Controlled Attribute</key>
<value>
<name>Rate Controlled Attribute</name>
</value>
</entry>
<entry>
<key>Time Duration</key>
<value>
<name>Time Duration</name>
</value>
</entry>
<entry>
<key>Grouping Attribute</key>
<value>
<name>Grouping Attribute</name>
</value>
</entry>
</descriptors>
<executionNode>ALL</executionNode>
<lossTolerant>false</lossTolerant>
<penaltyDuration>30 sec</penaltyDuration>
<properties>
<entry>
<key>Rate Control Criteria</key>
<value>flowfile count</value>
</entry>
<entry>
<key>Maximum Rate</key>
<value>1</value>
</entry>
<entry>
<key>Rate Controlled Attribute</key>
</entry>
<entry>
<key>Time Duration</key>
<value>10 sec</value>
</entry>
<entry>
<key>Grouping Attribute</key>
</entry>
</properties>
<runDurationMillis>0</runDurationMillis>
<schedulingPeriod>0 sec</schedulingPeriod>
<schedulingStrategy>TIMER_DRIVEN</schedulingStrategy>
<yieldDuration>1 sec</yieldDuration>
</config>
<name>Some time consuming process</name>
<relationships>
<autoTerminate>false</autoTerminate>
<name>failure</name>
</relationships>
<relationships>
<autoTerminate>false</autoTerminate>
<name>success</name>
</relationships>
<style></style>
<type>org.apache.nifi.processors.standard.ControlRate</type>
</processors>
<processors>
<id>26899782-7cd2-3c80-0000-000000000000</id>
<parentGroupId>98352fd8-023e-3c2f-0000-000000000000</parentGroupId>
<position>
<x>2645.6357166158573</x>
<y>1356.4797358999253</y>
</position>
<bundle>
<artifact>nifi-standard-nar</artifact>
<group>org.apache.nifi</group>
<version>1.4.0-SNAPSHOT</version>
</bundle>
<config>
<bulletinLevel>WARN</bulletinLevel>
<comments></comments>
<concurrentlySchedulableTaskCount>1</concurrentlySchedulableTaskCount>
<descriptors>
<entry>
<key>Log Level</key>
<value>
<name>Log Level</name>
</value>
</entry>
<entry>
<key>Log Payload</key>
<value>
<name>Log Payload</name>
</value>
</entry>
<entry>
<key>Attributes to Log</key>
<value>
<name>Attributes to Log</name>
</value>
</entry>
<entry>
<key>Attributes to Ignore</key>
<value>
<name>Attributes to Ignore</name>
</value>
</entry>
<entry>
<key>Log prefix</key>
<value>
<name>Log prefix</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>Log Level</key>
<value>info</value>
</entry>
<entry>
<key>Log Payload</key>
<value>false</value>
</entry>
<entry>
<key>Attributes to Log</key>
</entry>
<entry>
<key>Attributes to Ignore</key>
</entry>
<entry>
<key>Log prefix</key>
</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>LogAttribute</name>
<relationships>
<autoTerminate>false</autoTerminate>
<name>success</name>
</relationships>
<style></style>
<type>org.apache.nifi.processors.standard.LogAttribute</type>
</processors>
<processors>
<id>2be98623-184a-309f-0000-000000000000</id>
<parentGroupId>98352fd8-023e-3c2f-0000-000000000000</parentGroupId>
<position>
<x>3158.279808412732</x>
<y>1151.880075255394</y>
</position>
<bundle>
<artifact>nifi-standard-nar</artifact>
<group>org.apache.nifi</group>
<version>1.4.0-SNAPSHOT</version>
</bundle>
<config>
<bulletinLevel>WARN</bulletinLevel>
<comments></comments>
<concurrentlySchedulableTaskCount>1</concurrentlySchedulableTaskCount>
<descriptors>
<entry>
<key>release-signal-id</key>
<value>
<name>release-signal-id</name>
</value>
</entry>
<entry>
<key>signal-counter-name</key>
<value>
<name>signal-counter-name</name>
</value>
</entry>
<entry>
<key>signal-counter-delta</key>
<value>
<name>signal-counter-delta</name>
</value>
</entry>
<entry>
<key>signal-buffer-count</key>
<value>
<name>signal-buffer-count</name>
</value>
</entry>
<entry>
<key>distributed-cache-service</key>
<value>
<identifiesControllerService>org.apache.nifi.distributed.cache.client.AtomicDistributedMapCacheClient</identifiesControllerService>
<name>distributed-cache-service</name>
</value>
</entry>
<entry>
<key>attribute-cache-regex</key>
<value>
<name>attribute-cache-regex</name>
</value>
</entry>
</descriptors>
<executionNode>ALL</executionNode>
<lossTolerant>false</lossTolerant>
<penaltyDuration>30 sec</penaltyDuration>
<properties>
<entry>
<key>release-signal-id</key>
<value>functionId</value>
</entry>
<entry>
<key>signal-counter-name</key>
<value>default</value>
</entry>
<entry>
<key>signal-counter-delta</key>
<value>1</value>
</entry>
<entry>
<key>signal-buffer-count</key>
<value>1</value>
</entry>
<entry>
<key>distributed-cache-service</key>
<value>bd6674a6-3b20-3cdb-0000-000000000000</value>
</entry>
<entry>
<key>attribute-cache-regex</key>
</entry>
</properties>
<runDurationMillis>0</runDurationMillis>
<schedulingPeriod>0 sec</schedulingPeriod>
<schedulingStrategy>TIMER_DRIVEN</schedulingStrategy>
<yieldDuration>1 sec</yieldDuration>
</config>
<name>Notify</name>
<relationships>
<autoTerminate>false</autoTerminate>
<name>failure</name>
</relationships>
<relationships>
<autoTerminate>false</autoTerminate>
<name>success</name>
</relationships>
<style>
<entry>
<key>background-color</key>
<value>#7ccf89</value>
</entry>
</style>
<type>org.apache.nifi.processors.standard.Notify</type>
</processors>
<processors>
<id>30916515-e4a0-3a26-0000-000000000000</id>
<parentGroupId>98352fd8-023e-3c2f-0000-000000000000</parentGroupId>
<position>
<x>2172.600023256482</x>
<y>905.6399397573473</y>
</position>
<bundle>
<artifact>nifi-standard-nar</artifact>
<group>org.apache.nifi</group>
<version>1.4.0-SNAPSHOT</version>
</bundle>
<config>
<bulletinLevel>WARN</bulletinLevel>
<comments></comments>
<concurrentlySchedulableTaskCount>1</concurrentlySchedulableTaskCount>
<descriptors>
<entry>
<key>release-signal-id</key>
<value>
<name>release-signal-id</name>
</value>
</entry>
<entry>
<key>target-signal-count</key>
<value>
<name>target-signal-count</name>
</value>
</entry>
<entry>
<key>signal-counter-name</key>
<value>
<name>signal-counter-name</name>
</value>
</entry>
<entry>
<key>wait-buffer-count</key>
<value>
<name>wait-buffer-count</name>
</value>
</entry>
<entry>
<key>releasable-flowfile-count</key>
<value>
<name>releasable-flowfile-count</name>
</value>
</entry>
<entry>
<key>expiration-duration</key>
<value>
<name>expiration-duration</name>
</value>
</entry>
<entry>
<key>distributed-cache-service</key>
<value>
<identifiesControllerService>org.apache.nifi.distributed.cache.client.AtomicDistributedMapCacheClient</identifiesControllerService>
<name>distributed-cache-service</name>
</value>
</entry>
<entry>
<key>attribute-copy-mode</key>
<value>
<name>attribute-copy-mode</name>
</value>
</entry>
<entry>
<key>wait-mode</key>
<value>
<name>wait-mode</name>
</value>
</entry>
</descriptors>
<executionNode>ALL</executionNode>
<lossTolerant>false</lossTolerant>
<penaltyDuration>30 sec</penaltyDuration>
<properties>
<entry>
<key>release-signal-id</key>
<value>functionId</value>
</entry>
<entry>
<key>target-signal-count</key>
<value>1</value>
</entry>
<entry>
<key>signal-counter-name</key>
</entry>
<entry>
<key>wait-buffer-count</key>
<value>1</value>
</entry>
<entry>
<key>releasable-flowfile-count</key>
<value>1</value>
</entry>
<entry>
<key>expiration-duration</key>
<value>10 min</value>
</entry>
<entry>
<key>distributed-cache-service</key>
<value>bd6674a6-3b20-3cdb-0000-000000000000</value>
</entry>
<entry>
<key>attribute-copy-mode</key>
<value>keeporiginal</value>
</entry>
<entry>
<key>wait-mode</key>
<value>keep</value>
</entry>
</properties>
<runDurationMillis>0</runDurationMillis>
<schedulingPeriod>0 sec</schedulingPeriod>
<schedulingStrategy>TIMER_DRIVEN</schedulingStrategy>
<yieldDuration>1 sec</yieldDuration>
</config>
<name>Wait</name>
<relationships>
<autoTerminate>false</autoTerminate>
<name>expired</name>
</relationships>
<relationships>
<autoTerminate>false</autoTerminate>
<name>failure</name>
</relationships>
<relationships>
<autoTerminate>false</autoTerminate>
<name>success</name>
</relationships>
<relationships>
<autoTerminate>true</autoTerminate>
<name>wait</name>
</relationships>
<style>
<entry>
<key>background-color</key>
<value>#7ccf89</value>
</entry>
</style>
<type>org.apache.nifi.processors.standard.Wait</type>
</processors>
<processors>
<id>35ca3968-bad4-3cc0-0000-000000000000</id>
<parentGroupId>98352fd8-023e-3c2f-0000-000000000000</parentGroupId>
<position>
<x>2174.032152162732</x>
<y>699.3454457387926</y>
</position>
<bundle>
<artifact>nifi-standard-nar</artifact>
<group>org.apache.nifi</group>
<version>1.4.0-SNAPSHOT</version>
</bundle>
<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>${now()}</value>
</entry>
</properties>
<runDurationMillis>0</runDurationMillis>
<schedulingPeriod>3 sec</schedulingPeriod>
<schedulingStrategy>TIMER_DRIVEN</schedulingStrategy>
<yieldDuration>1 sec</yieldDuration>
</config>
<name>Input</name>
<relationships>
<autoTerminate>false</autoTerminate>
<name>success</name>
</relationships>
<style></style>
<type>org.apache.nifi.processors.standard.GenerateFlowFile</type>
</processors>
</contents>
<name>Using WaitNotify to limit flow</name>
</processGroups>
</snippet>
<timestamp>07/11/2017 13:12:45 JST</timestamp>
</template>
@jpierre
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jpierre commented May 24, 2020

Hello @ijokarumawak, i have a question, in the image you shows after wait processor there are 6 flowfiles queue. I think wait processor have to release just one by one flowfiles. I think there's a mistake in the way you process all files.

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