Beginner's Hadoop

June 19, 2016

Missing Imputation in python

Imputation: In statistics, imputation is the process of replacing missing data with substituted values. When substituting for a data point, it is known as “unit imputation”; when substituting...

Hadoop / Scala / Spark / Spark Sql

May 30, 2016

Spark SQL Using Parquet

Today, I’m focusing on how to use parquet format in spark. Please get the more insight about parquet format If you are new to this format. Parquet: Apache Parquet is a...

Hadoop / Scala / Spark / Spark Sql

May 28, 2016

Spark SQL using Avro

Today, I’m flashing lights on how to use Avro, a data serialization system, data format on spark sql. Unlike hive spark does not provides direct support for the...

Hadoop / Scala / Spark / Spark Sql

May 23, 2016

Spark SQL Using Hive

In this blog I’m going to describe how to integrate hive with spark. You may find this code on spark’s official github page. My effort is to describe...

Spark / Spark Streaming

April 20, 2016

Spark Streaming : Word Count Example

Spark Streaming makes it easy to build scalable fault-tolerant streaming applications. Spark Stream API is a near real time streaming it supports Java, Scala, Python and R....

iOS / Mobile / swift

April 20, 2016

Convert Image to Base64 string in iOS

Swift

//create image instance
//with image name from bundle
var image : UIImage = UIImage(named:"imageNameHere")
var imageData = UIImagePNGRepresentation(image)

//OR with path
var url:NSURL = NSURL.URLWithString("urlHere")
var imageData:NSData = NSData.dataWithContentsOfURL(url, options: nil, error: nil)

//create image instance

//with image name from bundle

var image : UIImage = UIImage(named:"imageNameHere")

var imageData = UIImagePNGRepresentation(image)

//OR with path

var url:NSURL = NSURL.URLWithString("urlHere")

var imageData:NSData = NSData.dataWithContentsOfURL(url, options: nil, error: nil)

Encoding

let base64String = imageData.base64EncodedStringWithOptions(NSDataBase64EncodingOptions.fromRaw(0)!)
println(base64String)

1 2	let base64String = imageData.base64EncodedStringWithOptions(NSDataBase64EncodingOptions.fromRaw(0)!) println(base64String)

Decoding

let decodedData = NSData(base64EncodedString: base64String, options: NSDataBase64DecodingOptions.fromRaw(0)!)
var decodedimage = UIImage(data: decodedData)
println(decodedimage)
yourImageView.image = decodedimage as UIImage

let decodedData = NSData(base64EncodedString: base64String, options: NSDataBase64DecodingOptions.fromRaw(0)!)

var decodedimage = UIImage(data: decodedData)

println(decodedimage)

yourImageView.image = decodedimage as UIImage

iOS7 > Objectice-C version You can use NSData’s base64EncodedStringWithOptions Now encode as:

- (NSString *)encodeToBase64String:(UIImage *)image {
return [UIImagePNGRepresentation(image) base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
}

- (NSString *)encodeToBase64String:(UIImage *)image {

return [UIImagePNGRepresentation(image) base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];

}

Decode as:

- (UIImage *)decodeBase64ToImage:(NSString *)strEncodeData {
NSData *data = [[NSData alloc]initWithBase64EncodedString:strEncodeData options:NSDataBase64DecodingIgnoreUnknownCharacters];
return [UIImage imageWithData:data];
}

- (UIImage *)decodeBase64ToImage:(NSString *)strEncodeData {

NSData *data = [[NSData alloc]initWithBase64EncodedString:strEncodeData options:NSDataBase64DecodingIgnoreUnknownCharacters];

return [UIImage imageWithData:data];

}

Scala / Spark / Spark Streaming

April 19, 2016

Network Streaming in Spark

Network streaming in spark is another interesting topic, here I am going to explain how network streaming works and will provide complete spark scala code. Before jumping to the code, I...