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Apache Spark is a unified analytics engine for large-scale data processing.It provides high-level APIs in Java, Scala, Python and R,and an optimized engine that supports general execution graphs.It also supports a rich set of higher-level tools including Spark SQL for SQL and structured data processing, MLlib for machine learning, GraphX for graph processing, and Structured Streaming for incremental computation and stream processing.

Security in Spark is OFF by default. This could mean you are vulnerable to attack by default.Please see Spark Security before downloading and running Spark.

Get Spark from the downloads page of the project website. This documentation is for Spark version 3.0.1. Spark uses Hadoop's client libraries for HDFS and YARN. Downloads are pre-packaged for a handful of popular Hadoop versions.Users can also download a 'Hadoop free' binary and run Spark with any Hadoop versionby augmenting Spark's classpath.Scala and Java users can include Spark in their projects using its Maven coordinates and Python users can install Spark from PyPI.

If you'd like to build Spark from source, visit Building Spark.

Spark runs on both Windows and UNIX-like systems (e.g. Linux, Mac OS), and it should run on any platform that runs a supported version of Java. This should include JVMs on x86_64 and ARM64. It's easy to run locally on one machine — all you need is to have java installed on your system PATH, or the JAVA_HOME environment variable pointing to a Java installation.

Spark runs on Java 8/11, Scala 2.12, Python 2.7+/3.4+ and R 3.5+.Java 8 prior to version 8u92 support is deprecated as of Spark 3.0.0.Python 2 and Python 3 prior to version 3.6 support is deprecated as of Spark 3.0.0.For the Scala API, Spark 3.0.1uses Scala 2.12. You will need to use a compatible Scala version(2.12.x).

For Java 11, -Dio.netty.tryReflectionSetAccessible=true is required additionally for Apache Arrow library. This prevents java.lang.UnsupportedOperationException: sun.misc.Unsafe or java.nio.DirectByteBuffer.(long, int) not available when Apache Arrow uses Netty internally.

Spark comes with several sample programs. Scala, Java, Python and R examples are in theexamples/src/main directory. To run one of the Java or Scala sample programs, usebin/run-example [params] in the top-level Spark directory. (Behind the scenes, thisinvokes the more generalspark-submit script forlaunching applications). For example,

You can also run Spark interactively through a modified version of the Scala shell. This is agreat way to learn the framework.

The --master option specifies themaster URL for a distributed cluster, or local to runlocally with one thread, or local[N] to run locally with N threads. You should start by usinglocal for testing. For a full list of options, run Spark shell with the --help option.

Spark also provides a Python API. To run Spark interactively in a Python interpreter, usebin/pyspark:

Example applications are also provided in Python. For example,

Spark also provides an R API since 1.4 (only DataFrames APIs included).To run Spark interactively in an R interpreter, use bin/sparkR:

Example applications are also provided in R. For example,

The Spark cluster mode overview explains the key concepts in running on a cluster.Spark can run both by itself, or over several existing cluster managers. It currently provides severaloptions for deployment:

• Standalone Deploy Mode: simplest way to deploy Spark on a private cluster

Programming Guides:

• Quick Start: a quick introduction to the Spark API; start here!
• RDD Programming Guide: overview of Spark basics - RDDs (core but old API), accumulators, and broadcast variables
• Spark SQL, Datasets, and DataFrames: processing structured data with relational queries (newer API than RDDs)
• Structured Streaming: processing structured data streams with relation queries (using Datasets and DataFrames, newer API than DStreams)
• Spark Streaming: processing data streams using DStreams (old API)
• MLlib: applying machine learning algorithms
• GraphX: processing graphs

API Docs:

Deployment Guides:

• Cluster Overview: overview of concepts and components when running on a cluster
• Submitting Applications: packaging and deploying applications
• Deployment modes:
  • Amazon EC2: scripts that let you launch a cluster on EC2 in about 5 minutes
  • Standalone Deploy Mode: launch a standalone cluster quickly without a third-party cluster manager
  • Mesos: deploy a private cluster using Apache Mesos
  • YARN: deploy Spark on top of Hadoop NextGen (YARN)
  • Kubernetes: deploy Spark on top of Kubernetes

Other Documents:

• Configuration: customize Spark via its configuration system
• Monitoring: track the behavior of your applications
• Tuning Guide: best practices to optimize performance and memory use
• Job Scheduling: scheduling resources across and within Spark applications
• Security: Spark security support
• Hardware Provisioning: recommendations for cluster hardware
• Integration with other storage systems:
• Migration Guide: Migration guides for Spark components
• Building Spark: build Spark using the Maven system
• Third Party Projects: related third party Spark projects

External Resources:

• Spark Community resources, including local meetups
• Mailing Lists: ask questions about Spark here
• AMP Camps: a series of training camps at UC Berkeley that featured talks andexercises about Spark, Spark Streaming, Mesos, and more. Videos,slides and exercises areavailable online for free.
• Code Examples: more are also available in the examples subfolder of Spark (Scala, Java, Python, R)

Generic ESP8266 Module¶

These modules come in different form factors and pinouts. See the page at ESP8266 community wiki for more info: ESP8266 Module Family.

Usually these modules have no bootstapping resistors on board, insufficient decoupling capacitors, no voltage regulator, no reset circuit, and no USB-serial adapter. This makes using them somewhat tricky, compared to development boards which add these features.

In order to use these modules, make sure to observe the following:

• Provide sufficient power to the module. For stable use of the ESP8266 a power supply with 3.3V and >= 250mA is required. Using the power available from USB to Serial adapter is not recommended, these adapters typically do not supply enough current to run ESP8266 reliably in every situation. An external supply or regulator alongwith filtering capacitors is preferred.

• Connect bootstapping resistors to GPIO0, GPIO2, GPIO15 according to the schematics below.

• Put ESP8266 into bootloader mode before uploading code.

Serial Adapter¶

There are many different USB to Serial adapters / boards. To be able to put ESP8266 into bootloader mode using serial handshaking lines, you need the adapter which breaks out RTS and DTR outputs. CTS and DSR are not useful for upload (they are inputs). Make sure the adapter can work with 3.3V IO voltage: it should have a jumper or a switch to select between 5V and 3.3V, or be marked as 3.3V only.

Adapters based around the following ICs should work:

• FT232RL

• CP2102

• CH340G

PL2303-based adapters are known not to work on Mac OS X. See https://github.com/igrr/esptool-ck/issues/9 for more info.

Minimal Hardware Setup for Bootloading and Usage¶

• Note

• GPIO15 is also named MTDO

• Reset is also named RSBT or REST (adding PullUp improves thestability of the module)

• GPIO2 is alternative TX for the boot loader mode

• Directly connecting a pin to VCC or GND is not a substitute for aPullUp or PullDown resistor, doing this can break upload managementand the serial console, instability has also been noted in somecases.

ESP to Serial¶

Minimal Hardware Setup for Bootloading only¶

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ESPxx Hardware

• Note

• if no RTS is used a manual power toggle is needed

Minimal Hardware Setup for Running only¶

ESPxx Hardware

Minimal¶

Improved Stability¶

Boot Messages and Modes¶

The ESP module checks at every boot the Pins 0, 2 and 15. based on them its boots in different modes:

at startup the ESP prints out the current boot mode example:

note: - GPIO2 is used as TX output and the internal Pullup is enabled on boot.

rst cause¶

boot mode¶

the first value respects the pin setup of the Pins 0, 2 and 15.

note: - number = ((GPIO15 << 2) | (GPIO0 << 1) | GPIO2);

Generic ESP8285 Module¶

ESP8285 (datasheet) is a multi-chip package which contains ESP8266 and 1MB flash. All points related to bootstrapping resistors and recommended circuits listed above apply to ESP8285 as well.

Note that since ESP8285 has SPI flash memory internally connected in DOUT mode, pins 9 and 10 may be used as GPIO / I2C / PWM pins.

Adafruit Feather HUZZAH ESP8266¶

The Adafruit Feather HUZZAH ESP8266 is an Arduino-compatible Wi-Fi development board powered by Ai-Thinker's ESP-12S, clocked at 80 MHz at 3.3V logic. A high-quality SiLabs CP2104 USB-Serial chip is included so that you can upload code at a blistering 921600 baud for fast development time. It also has auto-reset so no noodling with pins and reset button pressings. A 3.7V Lithium polymer battery connector is included, making it ideal for portable projects. The Adafruit Feather HUZZAH ESP8266 will automatically recharge a connected battery when USB power is available.

Product page: https://www.adafruit.com/product/2821

Invent One¶

The Invent One is an Arduino-compatible Wi-Fi development board powered by Ai-Thinker's ESP-12F, clocked at 80 MHz at 3.3V logic. It has an onboard ADC (PCF8591) so that you can have multiple analog inputs to work with. More information can be found here: https://blog.inventone.ng

Product page: https://inventone.ng

XinaBox CW01¶

The XinaBox CW01(ESP8266) is an Arduino-compatible Wi-Fi development board powered by an ESP-12F, clocked at 80 MHz at 3.3V logic. The CW01 has an onboard RGB LED and 3 xBUS connection ports.

Product page: https://xinabox.cc/products/CW01

ESPresso Lite 1.0¶

ESPresso Lite 1.0 (beta version) is an Arduino-compatible Wi-Fi development board powered by Espressif System's own ESP8266 WROOM-02 module. It has breadboard-friendly breakout pins with in-built LED, two reset/flash buttons and a user programmable button . The operating voltage is 3.3VDC, regulated with 800mA maximum current. Special distinctive features include on-board I2C pads that allow direct connection to OLED LCD and sensor boards.

ESPresso Lite 2.0¶

ESPresso Lite 2.0 is an Arduino-compatible Wi-Fi development board based on an earlier V1 (beta version). Re-designed together with Cytron Technologies, the newly-revised ESPresso Lite V2.0 features the auto-load/auto-program function, eliminating the previous need to reset the board manually before flashing a new program. It also feature two user programmable side buttons and a reset button. The special distinctive features of on-board pads for I2C sensor and actuator is retained.

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Phoenix 2.0¶

Product page: http://www.espert.co

NodeMCU 0.9 (ESP-12 Module)¶

Pin mapping¶

Pin numbers written on the board itself do not correspond to ESP8266 GPIO pin numbers. Constants are defined to make using this board easier:

If you want to use NodeMCU pin 5, use D5 for pin number, and it will be translated to ‘real' GPIO pin 14.

NodeMCU 1.0 (ESP-12E Module)¶

This module is sold under many names for around $6.50 on AliExpress and it's one of the cheapest, fully integrated ESP8266 solutions.

It's an open hardware design with an ESP-12E core and 4 MB of SPI flash.

According to the manufacturer, 'with a micro USB cable, you can connect NodeMCU devkit to your laptop and flash it without any trouble'. This is more or less true: the board comes with a CP2102 onboard USB to serial adapter which just works, well, the majority of the time. Sometimes flashing fails and you have to reset the board by holding down FLASH +RST, then releasing FLASH, then releasing RST. This forces the CP2102 device to power cycle and to be re-numbered by Linux.

The board also features a NCP1117 voltage regulator, a blue LED on GPIO16 and a 220k/100k Ohm voltage divider on the ADC input pin.The ESP-12E usually has a led connected on GPIO2.

Full pinout and PDF schematics can be found here

Olimex MOD-WIFI-ESP8266(-DEV)¶

This board comes with 2 MB of SPI flash and optional accessories (e.g. evaluation board ESP8266-EVB or BAT-BOX for batteries).

The basic module has three solder jumpers that allow you to switch the operating mode between SDIO, UART and FLASH.

The board is shipped for FLASH operation mode, with jumpers TD0JP=0, IO0JP=1, IO2JP=1.

Since jumper IO0JP is tied to GPIO0, which is PIN 21, you'll have to ground it before programming with a USB to serial adapter and reset the board by power cycling it.

UART pins for programming and serial I/O are GPIO1 (TXD, pin 3) and GPIO3 (RXD, pin 4).

You can find the board schematics here

SparkFun ESP8266 Thing¶

Product page: https://www.sparkfun.com/products/13231

SparkFun ESP8266 Thing Dev¶

Product page: https://www.sparkfun.com/products/13711

SparkFun Blynk Board¶

Product page: https://www.sparkfun.com/products/13794

LOLIN(WEMOS) D1 R2 & mini¶

Product page: https://www.wemos.cc/

LOLIN(WEMOS) D1 mini Pro¶

Product page: https://www.wemos.cc/

LOLIN(WEMOS) D1 mini Lite¶

Parameters in Arduino IDE:¶

• Card: 'WEMOS D1 Mini Lite'

• Flash Size: '1M (512K FS)'

• CPU Frequency: '80 Mhz'

Power:¶

• 5V pin : 4.7V 500mA output when the board is powered by USB ; 3.5V-6V input

• 3V3 pin : 3.3V 500mA regulated output

• Digital pins : 3.3V 30mA.

links:¶

• Product page: https://www.wemos.cc/

• Board schematic: https://wiki.wemos.cc/_media/products:d1:sch_d1_mini_lite_v1.0.0.pdf

• ESP8285 datasheet: https://www.espressif.com/sites/default/files/0a-esp8285_datasheet_en_v1.0_20160422.pdf

• Voltage regulator datasheet: http://pdf-datasheet.datasheet.netdna-cdn.com/pdf-down/M/E/6/ME6211-Microne.pdf

ESPino (ESP-12 Module)¶

ESPino integrates the ESP-12 module with a 3.3v regulator, CP2104 USB-Serial bridge and a micro USB connector for easy programming. It is designed for fitting in a breadboard and has an RGB Led and two buttons for easy prototyping.

For more information about the hardware, pinout diagram and programming procedures, please see the datasheet.

Product page: http://www.espino.io/en

ThaiEasyElec's ESPino¶

ESPino by ThaiEasyElec using WROOM-02 module from Espressif Systems with 4 MB Flash.

We will update an English description soon. - Product page:http://thaieasyelec.com/products/wireless-modules/wifi-modules/espino-wifi-development-board-detail.html- Schematics:www.thaieasyelec.com/downloads/ETEE052/ETEE052_ESPino_Schematic.pdf -Dimensions:http://thaieasyelec.com/downloads/ETEE052/ETEE052_ESPino_Dimension.pdf- Pinouts:http://thaieasyelec.com/downloads/ETEE052/ETEE052_ESPino_User_Manual_TH_v1_0_20160204.pdf (Please see pg. 8)

WifInfo¶

WifInfo integrates the ESP-12 or ESP-07+Ext antenna module with a 3.3v regulator and the hardware to be able to measure French telemetry issue from ERDF powering meter serial output. It has a USB connector for powering, an RGB WS2812 Led, 4 pins I2C connector to fit OLED or sensor, and two buttons + FTDI connector and auto reset feature.

For more information, please see WifInfo related blog entries, github and community forum.

4D Systems gen4 IoD Range¶

gen4-IoD Range of ESP8266 powered Display Modules by 4D Systems.

2.4', 2.8' and 3.2' TFT LCD with uSD card socket and Resistive Touch. Chip Antenna + uFL Connector.

Datasheet and associated downloads can be found on the 4D Systems product page.

The gen4-IoD range can be programmed using the Arduino IDE and also the 4D Systems Workshop4 IDE, which incorporates many additional graphics benefits. GFX4d library is available, along with a number of demo applications.

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• Product page: https://4dsystems.com.au/products/iot-display-modules

Digistump Oak¶

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The Oak requires an Serial Adapter for a serial connection or flashing; its micro USB port is only for power.

To make a serial connection, wire the adapter's TX to P3, RX to P4, and GND to GND. Supply 3.3v from the serial adapter if not already powered via USB.

To put the board into bootloader mode, configure a serial connection as above, connect P2 to GND, then re-apply power. Once flashing is complete, remove the connection from P2 to GND, then re-apply power to boot into normal mode.

WiFiduino¶

Product page: https://wifiduino.com/esp8266

Amperka WiFi Slot¶

Product page: http://wiki.amperka.ru/wifi-slot

Seeed Wio Link¶

Wio Link is designed to simplify your IoT development. It is an ESP8266 based open-source Wi-Fi development board to create IoT applications by virtualizing plug-n-play modules to RESTful APIs with mobile APPs. Wio Link is also compatible with the Arduino IDE.

Please DO NOTICE that you MUST pull up pin 15 to enable the power for Grove ports, the board is designed like this for the purpose of peripherals power management.

Product page: https://www.seeedstudio.com/Wio-Link-p-2604.html

ESPectro Core¶

ESPectro Core is ESP8266 development board as the culmination of our 3+ year experience in exploring and developing products with ESP8266 MCU.

Initially designed for kids in mind, everybody should be able to use it. Yet it's still hacker-friendly as we break out all ESP8266 ESP-12F pins.

More details at https://shop.makestro.com/product/espectrocore/

Schirmilabs Eduino WiFi¶

Eduino WiFi is an Arduino-compatible DIY WiFi development board using an ESP-12 module

Product page: https://schirmilabs.de/?page_id=165

ITEAD Sonoff¶

ESP8266 based devices from ITEAD: Sonoff SV, Sonoff TH, Sonoff Basic, and Sonoff S20

These are not development boards. The development process is inconvenient with these devices. When flashing firmware you will need a Serial Adapter to connect it to your computer.

When flashing you will need to hold down the push button connected to the GPIO0 pin, while powering up with a safe 3.3 Volt source. Some USB Serial Adapters may supply enough power to handle flashing; however, it many may not supply enough power to handle the activities when the device reboots.

More product details at the bottom of https://www.itead.cc/wiki/Product/

DOIT ESP-Mx DevKit (ESP8285)¶

DOIT ESP-Mx DevKit - This is a development board by DOIT, with a DOIT ESP-Mx module (datasheet) using a ESP8285 Chip. With the DOIT ESP-Mx module, GPIO pins 9 and 10 are not available. The DOIT ESP-Mx DevKit board has a red power LED and a blue LED connected to GPIO16 and is active low to turn on. It uses a CH340C, USB to Serial converter chip.

ESP8285 (datasheet) is a multi-chip package which contains ESP8266 and 1MB flash.