MINIFICPP-380 Added missing toLower EL function

This closes #250.

Signed-off-by: Marc Parisi <phrocker@apache.org>
2 files changed
tree: a9a0eb5dc50f52740908f7de3f6b9371074783af
  1. .github/
  2. .gitignore
  3. .travis.yml
  4. CMakeLists.txt
  5. Extensions.md
  6. LICENSE
  7. LibExample/
  8. NOTICE
  9. PROCESSORS.md
  10. README.md
  11. aptitude.sh
  12. bin/
  13. bootstrap.sh
  14. centos.sh
  15. cmake/
  16. conf/
  17. controller/
  18. darwin.sh
  19. docker/
  20. docs/
  21. examples/
  22. extensions/
  23. fedora.sh
  24. libminifi/
  25. main/
  26. rheldistro.sh
  27. thirdparty/
README.md

Apache NiFi - MiNiFi - C++ Build Status

MiNiFi is a child project effort of Apache NiFi. This repository is for a native implementation in C++.

Table of Contents

Features

Apache NiFi - MiNiFi C++ is a complementary data collection approach that supplements the core tenets of NiFi in dataflow management, focusing on the collection of data at the source of its creation. The C++ implementation is an additional implementation to the one in Java with the aim of an even smaller resource footprint.

Specific goals for MiNiFi are comprised of:

  • small and lightweight footprint
  • central management of agents
  • generation of data provenance
  • integration with NiFi for follow-on dataflow management and full chain of custody of information

Perspectives of the role of MiNiFi should be from the perspective of the agent acting immediately at, or directly adjacent to, source sensors, systems, or servers.

Processors

MiNiFi - C++ supports the following processors:

Caveats

  • 0.4.0 represents a non-GA release, APIs and interfaces are subject to change
  • Build and usage currently only supports Linux and OS X environments. MiNiFi C++ can be built and run through the Windows Subsystem for Linux but we provide no support for this platform.
  • Provenance events generation is supported and are persisted using RocksDB. Volatile repositories can be used on systems without persistent storage.

System Requirements

To build

Utilities

  • CMake
    • 3.1 or greater
  • gcc
    • 4.8.4 or greater
  • g++
    • 4.8.4 or greater
  • bison
    • 3.0 or greater
  • flex
    • 2.5 or greater

NOTE if Lua support is enabled, then a C++ compiler with support for c++-14 must be used. If using GCC, version 6.x or greater is recommended.

Libraries / Development Headers

  • libboost and boost-devel
    • 1.48.0 or greater
  • libcurl
  • librocksdb4.1 and librocksdb-dev
  • libuuid and uuid-dev
  • openssl
  • Python 3 and development headers -- Required, unless Python support is disabled
  • Lua and development headers -- Optional, unless Lua support is enabled
  • libgps-dev -- Required if building libGPS support

** NOTE: IF ROCKSDB IS NOT INSTALLED, IT WILL BE BUILT FROM THE THIRD PARTY DIRECTORY UNLESS YOU SPECIFY -DDISABLE_ROCKSDB=true WITH CMAKE ***

CentOS 6

Additional environmental preparations are required for CentOS 6 support. Before building, install and enable the devtoolset-6 SCL:

$ sudo yum install centos-release-scl
$ sudo yum install devtoolset-6
$ scl enable devtoolset-6 bash

Additionally, for expression language support, it is recommended to install GNU Bison 3.x:

$ wget https://ftp.gnu.org/gnu/bison/bison-3.0.4.tar.xz
$ tar xvf bison-3.0.4.tar.xz
$ cd bison-3.0.4
$ ./configure
$ make
$ sudo make install

Finally, it is required to add the -lrt compiler flag by using the -DCMAKE_CXX_FLAGS=-lrt flag when invoking cmake.

To run

Libraries

  • libuuid
  • librocksdb *** IF NOT INSTALLED, WILL BE BUILT FROM THIRD PARTY DIRECTORY ***
  • libcurl
  • libssl and libcrypto from openssl
  • libarchive
  • librdkafka
  • Python 3 -- Required, unless Python support is disabled
  • Lua -- Optional, unless Lua support is enabled
  • libusb -- Optional, unless USB Camera support is enabled
  • libpng -- Optional, unless USB Camera support is enabled
  • libpcap -- Optional, unless ENABLE_PCAP specified

The needed dependencies can be installed with the following commands for:

Yum based Linux Distributions

NOTE if a newer compiler is required, such as when Lua support is enabled, it is recommended to use a newer compiler using a devtools-* package from the Software Collections (SCL).

# ~/Development/code/apache/nifi-minifi-cpp on git:master
$ yum install cmake \
  gcc gcc-c++ \
  bison \
  flex \
  libcurl-devel \
  rocksdb-devel rocksdb \
  libuuid libuuid-devel \
  boost-devel \
  openssl-devel \
  bzip2-devel \
  xz-devel \
  doxygen
$ # (Optional) for building Python support
$ yum install python34-devel
$ # (Optional) for building Lua support
$ yum install lua-devel
$ # (Optional) for building USB Camera support
$ yum install libusb-devel libpng-devel
$ # (Optional) for building docker image
$ yum install docker
$ # (Optional) for system integration tests
$ yum install docker python-virtualenv
# If building with GPS support
$ yum install gpsd-devel
$ # (Optional) for PacketCapture Processor
$ yum install libpcap-devel
Aptitude based Linux Distributions
# ~/Development/code/apache/nifi-minifi-cpp on git:master
$ apt-get install cmake \
  gcc g++ \
  bison \
  flex \
  libcurl-dev \
  librocksdb-dev librocksdb4.1 \
  uuid-dev uuid \
  libboost-all-dev libssl-dev \
  libbz2-dev liblzma-dev \
  doxygen
$ # (Optional) for building Python support
$ apt-get install libpython3-dev
$ # (Optional) for building Lua support
$ apt-get install liblua5.1-0-dev
$ # (Optional) for building USB Camera support
$ apt-get install libusb-1.0.0-0-dev libpng12-dev
$ # (Optional) for building docker image
$ apt-get install docker.io
$ # (Optional) for system integration tests
$ apt-get install docker.io python-virtualenv
# If building with GPS support
$ apt-get install libgps-dev
$ # (Optional) for PacketCapture Processor
$ apt-get install libpcap-dev
OS X Using Homebrew (with XCode Command Line Tools installed)
# ~/Development/code/apache/nifi-minifi-cpp on git:master
$ brew install cmake \
  bison \
  flex \
  rocksdb \
  ossp-uuid \
  boost \
  openssl \
  python \
  lua \
  xz \
  bzip2 \
  doxygen
$ brew install curl
$ brew link curl --force
$ # (Optional) for building USB Camera support
$ brew install libusb libpng
$ # (Optional) for building docker image/running system integration tests
$ # Install docker using instructions at https://docs.docker.com/docker-for-mac/install/
$ sudo pip install virtualenv
# If building with GPS support
$ brew install gpsd
$ # (Optional) for PacketCapture Processor
$ sudo brew install libpcap

Getting Started

Bootstrapping

  • MiNiFi C++ offers a bootstrap script in the root of our github repo that will boot strap the cmake and build process for you without the need to install dependencies yourself. To use this process, please run the command boostrap.sh from the root of the MiNiFi C++ source tree.

  • Per the table, below, you will be presented with a menu guided bootstrap process. You may enable and disable extensions ( further defined below ). Once you are finished selecting the features you wish to build, enter N to continue with the process. CMAKE dependencies will be resolved for your distro. You may enter command line options -n to force yes to all prompts ( including the package installation prompts ) and -b to automatically run make once the cmake process is complete. Alternatively, you may include the package argument to boostrap, -p, which will run make package.

  • If you provide -b or -p to bootstrap.sh, you do not need to follow the Building section, below. If you do not provide these arguments you may skip the cmake .. section from Building.

    # ~/Development/code/apache/nifi-minifi-cpp on git:master
    $ ./bootstrap.sh
    # CMAKE Build dir exists, should we overwrite your build directory before we begin?
      If you have already bootstrapped, bootstrapping again isn't necessary to run make [ Y/N ] Y
    $  ****************************************
       Select MiNiFi C++ Features to toggle.
      ****************************************
      A. Persistent Repositories .....Enabled
      B. Lib Curl Features ...........Enabled
      C. Lib Archive Features ........Enabled
      D. Execute Script support ......Enabled
      E. Expression Langauge support .Enabled
      F. Kafka support ...............Disabled
      G. PCAP support ................Disabled
      H. USB Camera support ..........Disabled
      I. GPS support .................Disabled
      J. TensorFlow Support ..........Disabled
      K. Enable all extensions
      L. Portable Build ..............Enabled
      M. Build with Debug symbols ....Disabled
      N. Continue with these options
      Q. Exit
      * Extension cannot be installed due to
        version of cmake or other software
    
      Enter choice [ A - N ] 
    

Building

  • From your source checkout, create a directory to perform the build (e.g. build) and cd into that directory.

    # ~/Development/code/apache/nifi-minifi-cpp on git:master
    $ mkdir build
    # ~/Development/code/apache/nifi-minifi-cpp on git:master
    $ cd build
    
  • Perform a cmake .. to generate the project files

    # ~/Development/code/apache/nifi-minifi-cpp on git:master
    $ cmake ..
    ...
    -- Configuring done
    -- Generating done
    -- Build files have been written to: /Users/apiri/Development/code/apache/nifi-minifi-cpp/build
    
  • Perform a build

    # ~/Development/code/apache/nifi-minifi-cpp on git:master
    $ make
    Scanning dependencies of target gmock_main
    Scanning dependencies of target gmock
    Scanning dependencies of target minifi
    Scanning dependencies of target gtest
    Scanning dependencies of target yaml-cpp
    [  1%] Building CXX object thirdparty/yaml-cpp-yaml-cpp-0.5.3/test/gmock-1.7.0/gtest/CMakeFiles/gtest.dir/src/gtest-all.cc.o
    [  3%] Building CXX object thirdparty/yaml-cpp-yaml-cpp-0.5.3/test/gmock-1.7.0/CMakeFiles/gmock.dir/gtest/src/gtest-all.cc.o
    [  3%] Building CXX object thirdparty/yaml-cpp-yaml-cpp-0.5.3/test/gmock-1.7.0/CMakeFiles/gmock.dir/src/gmock-all.cc.o
    [  6%] Building CXX object thirdparty/yaml-cpp-yaml-cpp-0.5.3/test/gmock-1.7.0/CMakeFiles/gmock_main.dir/gtest/src/gtest-all.cc.o
    [  6%] Building CXX object thirdparty/yaml-cpp-yaml-cpp-0.5.3/test/gmock-1.7.0/CMakeFiles/gmock_main.dir/src/gmock-all.cc.o
    [  7%] Building CXX object libminifi/CMakeFiles/minifi.dir/src/Configure.cpp.o
    
    ...
    
    [ 97%] Linking CXX executable minifi
    [ 97%] Built target minifiexe
    [ 98%] Building CXX object thirdparty/yaml-cpp-yaml-cpp-0.5.3/test/CMakeFiles/run-tests.dir/node/node_test.cpp.o
    [100%] Linking CXX executable run-tests
    [100%] Built target run-tests
    
  • Create a binary assembly located in your build directory with suffix -bin.tar.gz

    ~/Development/code/apache/nifi-minifi-cpp/build
    $ make package
    Run CPack packaging tool for source...
    CPack: Create package using TGZ
    CPack: Install projects
    CPack: - Install directory: ~/Development/code/apache/nifi-minifi-cpp
    CPack: Create package
    CPack: - package: ~/Development/code/apache/nifi-minifi-cpp/build/nifi-minifi-cpp-0.1.0-bin.tar.gz generated.
    
  • Create a source assembly located in your build directory with suffix -source.tar.gz

    ~/Development/code/apache/nifi-minifi-cpp/build
    $ make package_source
    Run CPack packaging tool for source...
    CPack: Create package using TGZ
    CPack: Install projects
    CPack: - Install directory: ~/Development/code/apache/nifi-minifi-cpp
    CPack: Create package
    CPack: - package: ~/Development/code/apache/nifi-minifi-cpp/build/nifi-minifi-cpp-0.1.0-source.tar.gz generated.
    
  • (Optional) Create a Docker image from the resulting binary assembly output from “make package”.

~/Development/code/apache/nifi-minifi-cpp/build
$ make docker
NiFi-MiNiFi-CPP Version: 0.4.0
Current Working Directory: /Users/jdyer/Development/github/nifi-minifi-cpp/docker
CMake Source Directory: /Users/jdyer/Development/github/nifi-minifi-cpp
MiNiFi Package: nifi-minifi-cpp-0.4.0-bin.tar.gz
Docker Command: 'docker build --build-arg UID=1000 --build-arg GID=1000 --build-arg MINIFI_VERSION=0.4.0 --build-arg MINIFI_PACKAGE=nifi-minifi-cpp-0.4.0-bin.tar.gz -t apacheminificpp:0.4.0 .'
Sending build context to Docker daemon 777.2 kB
Step 1 : FROM alpine:3.5
 ---> 88e169ea8f46
Step 2 : MAINTAINER Apache NiFi <dev@nifi.apache.org>

...

Step 15 : CMD $MINIFI_HOME/bin/minifi.sh run
 ---> Using cache
 ---> c390063d9bd1
Successfully built c390063d9bd1
Built target docker
  • (Optional) Execute system integration tests using the docker image built locally on a docker daemon running locally.
~/Development/code/apache/nifi-minifi-cpp/build
$ make docker-verify

Cleaning

Remove the build directory created above.

# ~/Development/code/apache/nifi-minifi-cpp on git:master
$ rm -rf ./build

Configuring

The ‘conf’ directory in the root contains a template config.yml document.

This is compatible with the format used with the Java MiNiFi application. Currently, a subset of the configuration is supported and MiNiFi C++ is currently compatible with version 1 of the MiNiFi YAML schema. Additional information on the YAML format for the config.yml and schema versioning can be found in the MiNiFi System Administrator Guide.

Additionally, users can utilize the MiNiFi Toolkit Converter (version 0.0.1 - schema version 1) to aid in creating a flow configuration from a generated template exported from a NiFi instance. The MiNiFi Toolkit Converter tool can be downloaded from http://nifi.apache.org/minifi/download.html under the MiNiFi Toolkit Binaries section. Information on its usage is available at https://nifi.apache.org/minifi/minifi-toolkit.html.

Flow Controller:
    id: 471deef6-2a6e-4a7d-912a-81cc17e3a205
    name: MiNiFi Flow

Processors:
    - name: GetFile
      id: 471deef6-2a6e-4a7d-912a-81cc17e3a206
      class: org.apache.nifi.processors.standard.GetFile
      max concurrent tasks: 1
      scheduling strategy: TIMER_DRIVEN
      scheduling period: 1 sec
      penalization period: 30 sec
      yield period: 1 sec
      run duration nanos: 0
      auto-terminated relationships list:
      Properties:
          Input Directory: /tmp/getfile
          Keep Source File: true

Connections:
    - name: TransferFilesToRPG
      id: 471deef6-2a6e-4a7d-912a-81cc17e3a207
      source name: GetFile
      source id: 471deef6-2a6e-4a7d-912a-81cc17e3a206
      source relationship name: success
      destination id: 471deef6-2a6e-4a7d-912a-81cc17e3a204
      max work queue size: 0
      max work queue data size: 1 MB
      flowfile expiration: 60 sec

Remote Processing Groups:
    - name: NiFi Flow
      id: 471deef6-2a6e-4a7d-912a-81cc17e3a208
      url: http://localhost:8080/nifi
      timeout: 30 secs
      yield period: 10 sec
      Input Ports:
          - id: 471deef6-2a6e-4a7d-912a-81cc17e3a204
            name: From Node A
            max concurrent tasks: 1
            Properties:

SiteToSite Security Configuration

in minifi.properties

enable tls ssl
nifi.remote.input.secure=true

if you want to enable client certificate base authorization
nifi.security.need.ClientAuth=true
setup the client certificate and private key PEM files
nifi.security.client.certificate=./conf/client.pem
nifi.security.client.private.key=./conf/client.pem
setup the client private key passphrase file
nifi.security.client.pass.phrase=./conf/password
setup the client CA certificate file
nifi.security.client.ca.certificate=./conf/nifi-cert.pem

if you do not want to enable client certificate base authorization
nifi.security.need.ClientAuth=false

HTTP SiteToSite Configuration

To enable HTTPSiteToSite you must set the following flag to true

nifi.remote.input.http.enabled=true

Command and Control Configuration

For more more insight into the API used within the C2 agent, please visit: https://cwiki.apache.org/confluence/display/MINIFI/C2+Design+Proposal

in minifi.properties

#Disable/Enable C2
nifi.c2.enable=true

#specify metrics classes
nifi.flow.metrics.classes=DeviceInformation,SystemInformation,ProcessMetrics

#specify C2 protocol
c2.agent.protocol.class=RESTSender

#control c2 heartbeat interval in millisecocnds
c2.agent.heartbeat.period=3000

# enable reporter classes
c2.agent.heartbeat.reporter.class=RESTReciver

Configuring Volatile and NO-OP Repositories

Each of the repositories can be configured to be volatile ( state kept in memory and flushed upon restart ) or persistent. Currently, the flow file and provenance repositories can persist to RocksDB. The content repository will persist to the local file system if a volatile repo is not configured.

To configure the repositories:

 in minifi.properties
 # For Volatile Repositories:
 nifi.flowfile.repository.class.name=VolatileFlowFileRepository
 nifi.provenance.repository.class.name=VolatileProvenanceRepository
 nifi.content.repository.class.name=VolatileContentRepository

 # configuration options
 # maximum number of entries to keep in memory
 nifi.volatile.repository.options.flowfile.max.count=10000
 # maximum number of bytes to keep in memory, also limited by option above
 nifi.volatile.repository.options.flowfile.max.bytes=1M

 # maximum number of entries to keep in memory
 nifi.volatile.repository.options.provenance.max.count=10000
 # maximum number of bytes to keep in memory, also limited by option above
 nifi.volatile.repository.options.provenance.max.bytes=1M

 # maximum number of entries to keep in memory
 nifi.volatile.repository.options.content.max.count=100000
 # maximum number of bytes to keep in memory, also limited by option above
 nifi.volatile.repository.options.content.max.bytes=1M
 # limits locking for the content repository
 nifi.volatile.repository.options.content.minimal.locking=true
 
 # For NO-OP Repositories:
 nifi.flowfile.repository.class.name=NoOpRepository
 nifi.provenance.repository.class.name=NoOpRepository

Caveats

Systems that have limited memory must be cognizant of the options above. Limiting the max count for the number of entries limits memory consumption but also limits the number of events that can be stored. If you are limiting the amount of volatile content you are configuring, you may have excessive session rollback due to invalid stream errors that occur when a claim cannot be found.

The content repository has a default option for “minimal.locking” set to true. This will attempt to use lock free structures. This may or may not be optimal as this requires additional additional searching of the underlying vector. This may be optimal for cases where max.count is not excessively high. In cases where object permanence is low within the repositories, minimal locking will result in better performance. If there are many processors and/or timing is such that the content repository fills up quickly, performance may be reduced. In all cases a locking cache is used to avoid the worst case complexity of O(n) for the content repository; however, this caching is more heavily used when “minimal.locking” is set to false.

Provenance Report

Add Provenance Reporting to config.yml
Provenance Reporting:
  scheduling strategy: TIMER_DRIVEN
  scheduling period: 1 sec
  url: http://localhost:8080/nifi
  port uuid: 471deef6-2a6e-4a7d-912a-81cc17e3a204
  batch size: 100

Http Configuration Listener

Http Configuration Listener will pull flow file configuration from the remote command control server,
validate and apply the new flow configuration

in minifi.properties

nifi.configuration.listener.type=http
nifi.configuration.listener.http.url=https://localhost:8080
nifi.configuration.listener.pull.interval=1 sec

if you want to enable client certificate
nifi.https.need.ClientAuth=true
nifi.https.client.certificate=./conf/client.pem
nifi.https.client.private.key=./conf/client.key
nifi.https.client.pass.phrase=./conf/password
nifi.https.client.ca.certificate=./conf/nifi-cert.pem

REST API access

Configure REST API user name and password
nifi.rest.api.user.name=admin
nifi.rest.api.password=password

if you want to enable client certificate
nifi.https.need.ClientAuth=true
nifi.https.client.certificate=./conf/client.pem
nifi.https.client.private.key=./conf/client.key
nifi.https.client.pass.phrase=./conf/password
nifi.https.client.ca.certificate=./conf/nifi-cert.pem

UID generation

MiNiFi needs to generate many unique identifiers in the course of operations. There are a few different uid implementations available that can be configured in minifi-uid.properties.

Implementation for uid generation can be selected using the uid.implementation property values:

  1. time - use uuid_generate_time (default option if the file or property value is missing or invalid)
  2. random - use uuid_generate_random
  3. uuid_default - use uuid_generate (will attempt to use uuid_generate_random and fall back to uuid_generate_time if no high quality randomness is available)
  4. minifi_uid - use custom uid algorthim

If minifi_uuid is selected MiNiFi will use a custom uid algorthim consisting of first N bits device identifier, second M bits as bottom portion of a timestamp where N + M = 64, the last 64 bits is an atomic incrementor.

This is faster than the random uuid generator and encodes the device id and a timestamp into every value, making tracing of flowfiles, etc easier.

It does require more configuration. uid.minifi.device.segment.bits is used to specify how many bits at the beginning to reserve for the device identifier. It also puts a limit on how many distinct devices can be used. With the default of 16 bits, there are a maximum of 65,535 unique device identifiers that can be used. The 48 bit timestamp won‘t repeat for almost 9,000 years. With 24 bits for the device identifier, there are a maximum of 16,777,215 unique device identifiers and the 40 bit timestamp won’t repeat for about 35 years.

Additionally, a unique hexadecimal uid.minifi.device.segment should be assigned to each MiNiFi instance.

Controller Services

If you need to reference a controller service in your config.yml file, use the following template. In the example, below, ControllerServiceClass is the name of the class defining the controller Service. ControllerService1 is linked to ControllerService2, and requires the latter to be started for ControllerService1 to start.

Controller Services:
  - name: ControllerService1
    id: 2438e3c8-015a-1000-79ca-83af40ec1974
  	class: ControllerServiceClass
  	Properties:
      Property one: value
      Linked Services:
        - value: ControllerService2
  - name: ControllerService2
    id: 2438e3c8-015a-1000-79ca-83af40ec1992
  	class: ControllerServiceClass
  	Properties:

Linux Power Manager Controller Service

The linux power manager controller service can be configured to monitor the battery level and status ( discharging or charging ) via the following configuration. Simply provide the capacity path and status path along with your threshold for the trigger and low battery alarm and you can monitor your battery and throttle the threadpools within MiNiFi C++. Note that the name is identified must be ThreadPoolManager.

Controller Services: - name: ThreadPoolManager id: 2438e3c8-015a-1000-79ca-83af40ec1888 class: LinuxPowerManagerService Properties: Battery Capacity Path: /path/to/battery/capacity Battery Status Path: /path/to/battery/status Trigger Threshold: 90 Low Battery Threshold: 50 Wait Period: 500 ms

Running

After completing a build, the application can be run by issuing the following from :

$ ./bin/minifi.sh start

By default, this will make use of a config.yml located in the conf directory. This configuration file location can be altered by adjusting the property nifi.flow.configuration.file in minifi.properties located in the conf directory.

Stopping

MiNiFi can then be stopped by issuing:

$ ./bin/minifi.sh stop

Installing as a service

MiNiFi can also be installed as a system service using minifi.sh with an optional “service name” (default: minifi)

$ ./bin/minifi.sh install [service name]

Managing MiNFI C++ through the MiNiFi Controller

The MiNiFi controller is an executable in the bin directory that can be used to control the MiNFi C++ agent while it runs. Currently the controller will let you stop subcomponents within a running instance, clear queues, get the status of queues, and update the flow for a warm re-deploy.

The minificontroller can track a single MiNiFi C++ agent through the use of three options. Port is required. The hostname is not and will default to localhost. Additionally, controller.socket.local.any.interface allows you to bind to any address when using localhost. Otherwise, we will bind only to the loopback adapter so only minificontroller on the local host can control the agent:

$ controller.socket.host=localhost
$ controller.socket.port=9998
$ controller.socket.local.any.interface=true/false ( default false)

These are defined by default to the above values. If the port option is left undefined, the MiNiFi controller will be disabled in your deployment.

The executable is stored in the bin directory and is titled minificontroller. Available commands are listed below.

Specifying connecting information

./minificontroller --host “host name” --port “port”

    * By default these options use those defined in minifi.properties and are not required

Start Command

./minificontroller --start “component name”

Stop command

./minificontroller --stop “component name”

List connections command

./minificontroller --list connections

List components command

./minificontroller --list components

Clear connection command

./minificontroller --clear “connection name”

GetSize command

./minificontroller --getsize “connection name”

   * Returns the size of the connection. The current size along with the max will be reported

Update flow

./minificontroller --updateflow “config yml”

   *Updates the flow file reference and performs a warm re-deploy.

Get full connection command

./minificontroller --getfull

   *Provides a list of full connections, if any.

Extensions

Please see Extensions.md on how to build and run conditionally built dependencies and extensions.

Documentation

See https://nifi.apache.org/minifi for the latest documentation.

Contributing

We welcome all contributions to Apache MiNiFi. To make development easier, we've included the linter for the Google Style guide. Google provides an Eclipse formatter for their style guide. It is located here. New contributions are expected to follow the Google style guide when it is reasonable. Additionally, all new files must include a copy of the Apache License Header.

MiNiFi C++ contains a dynamic loading mechanism that loads arbitrary objects. To maintain consistency of development amongst the NiFi ecosystem, it is called a class loader. If you are contributing a custom Processor or Controller Service, the mechanism to register your class into the default class loader is a pragma definition named:

REGISTER_RESOURCE(CLASSNAME);

To use this include REGISTER_RESOURCE(YourClassName); in your header file. The default class loader will make instnaces of YourClassName available for inclusion.

Once you have completed your changes, including source code and tests, you can verify that you follow the Google style guide by running the following command: $ make linter. This will provide output for all source files.

License

Except as otherwise noted this software is licensed under the Apache License, Version 2.0

For additional information regarding the source of included projects and the corresponding licenses, you may visit the following website

Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.