SF Scala, Jonas Bonér: The Road to Akka Cluster, and Beyond… https://www.youtube.com/watch?v=2wSYcyWCtx4...

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SF Scala, Jonas Bonér: The Road to Akka Cluster, and Beyond…
https://www.youtube.com/watch?v=2wSYcyWCtx4
https://www.youtube.com/watch?v=VCattsfHR4o&list=PL2zQ8PH7bGS-ADr-FIV91xr1C7IDrXKAF

SF Scala, Jonas Bonér: The Road to Akka Cluster, and Beyond…

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Akka Clustering, Step by Step You create an Actor, and send the actor immutable messages. Those messages...

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Akka Clustering, Step by Step
You create an Actor, and send the actor immutable messages. Those messages get queued through a mailbox, and the actor processes the messages one by one, in order they were received
Akka remoting
al remoteFooActor = context.actorSelection("akka.tcp://actorSystemName@10.0.0.1:2552/user/fooActor")

Clustering allows you to create an actor somewhere on a cluster consisting of nodes which all share the same actor system, without knowing exactly which node it is on. Other machines can join and leave the cluster at run time.
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This blog post shows how an Akka cluster works by walking through an example application in detail. Introduction Akka is an excellent toolkit for …

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Cassandra: The trouble with timestamps Cassandra uses timestamps to determine the most recent update...

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Cassandra: The trouble with timestamps
Cassandra uses timestamps to determine the most recent update to a column. The timestamp is provided by the client application. The latest timestamp always wins when requesting data, so if multiple client sessions update the same columns in a row concurrently, the most recent update is the one that readers see.
wall clocks
Logical clocks: Lamport clocks, Vector clocks
NTP, clock drift, leap seconds
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Cassandra breaks a row up into columns that can be updated independently.
timestamps are only used to pick a “winning” update within a single column or collection element. (A timestamp tie will also result in a deterministic, commutative result.) Lightweight transactions are available when linearizability is 
important.
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Some folks have asked whether Cassandra or Riak in last-write-wins mode are monotonically consistent, or whether they can guarantee read-your-writes, and so on. This is a fascinating question, and leads to all sorts of interesting properties about clocks and causality.

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09.05.2015 19:49

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As a Java developer, the syntax of python seems strange at first. Some code fragments are used often, but they are not easy to be remembered for new

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Synchronizing Clocks In a Cassandra Cluster http://ift.tt/1PwmNul...

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Synchronizing Clocks In a Cassandra Cluster
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Cassandra is a highly-distributable NoSQL database that's vulnerable: the deployment must run on synchronized clocks. Learn more about log management from

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Youtube: Add + button to share to G+ Why not?:) +YouTube +Google+ +Google+ Developers

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Youtube: Add + button to share to G+
Why not?:)
+YouTube +Google+ +Google+ Developers 

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Reshared post from SEMrush:

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Original Post from SEMrush:

Must read: The Rich Snippets Algorithm Evolution
+AJ Kohn talks about the changes to the rich snippets algoruthm and shares his thoughts on how Google might be replacing many rich snippets with Knowledge Graph panels and carousels. 

#googlesearch   #richsnippets   #searchresults  

The Rich Snippets Algorithm

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09.05.2015 04:28

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Eight hot technologies that were built in Scala

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Youtube: Companion Presentation/ppt/pdf There are a lot of educational video in youtube form a lot of...

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Youtube: Companion Presentation/ppt/pdf
There are a lot of educational video in youtube form a lot of great conferences, but it's hard to find them: as unlike webpage, it's hard to know the content of the video except some metadata such as title, description, author, organization etc.

Youtube can allow users to upload one companion presentation/ppt/pdf.
Youtube can use it for better search; also people can split the screen to 2 parts: one for video, one for presentation/ppt.
Youtube can use it to make better auto generation translation.
Business Benefit: Youtube can show ads in these 2 screen, one video ads, one static pic ads.
Better search.
+YouTube +Google Developers

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Learning Kafka Dual role, a leader & a follower for other partitions. Brokers are stateless. Push-Pull...

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Learning Kafka
Dual role, a leader & a follower for other partitions.
Brokers are stateless.
Push-Pull Mode
We can reconsume messages.
No master, Decentralized, all brokers are same.
Replication and in-sync replicas (ISR)
Checkpoint

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Android: Add search, translate, speak-the-page as system service, usable in every application Define...

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Android: Add search, translate, speak-the-page as system service, usable in every application
Define some standard actions in Android: as in Chrome Android: long press text, pop up menu, so user can choose translate, search or text-to-speech etc.
How to add them
If monopoly is a concern, google can make this extensible, open to selective developers so they can add more functions.
*Business Benefit: * More Search, more Google apps usage.
+Android 

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Android: text-to-speech, speak-the-page When people are walking(commuting to work or taking exercise...

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Android: text-to-speech, speak-the-page
When people are walking(commuting to work or taking exercise), they may check newstand or G+(walking is really boring for me), and if they find anything interesting, they want android can speak the page for them: obviously it's not safe and good experience to read page when walking.
Business Benefit:
Google can speak the Ads in page
-- There should be some alternative(short) text for ads, google can speak it.
More usage/engage for Google Apps/Service or Android apps
Better Service, better Android
+Android +Android Developers +Google AdSense

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Youtube: Show what quality user chooses and what quality it's now Before leaving home of office, I like...

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Youtube: Show what quality user chooses and what quality it's now
Before leaving home of office, I like to find some youtube video I want to watch on my way, cache it for several mins and then leave.
It may be playing 480p, I want to choose it to lowest definition, so I choose to 140p, but youtube doesn't change the quality option to 140p, still show the current definition.

I know the change actually takes effect, after Youtube plays cached content, it will change to 140P, but it's still better to immediately change the option to what user chooses, and at same time show current quality at the right side.
Business Benefit: Better User Experience.
+YouTube +Google Developers 

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Youtube: Video playback quality setting for mobile: high hd in Wi-Fi only, lowest when use 3/4G A lot...

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Youtube: Video playback quality setting for mobile: high hd in Wi-Fi only, lowest when use 3/4G
A lot of people are concerned about traffic usage on Mobile, for some people(including me), they just want to watch lowest definition video when use 3/4G, high hd video in Wi-Fi only.
Or add option: 
Always let user choose Video Quality first when use 3/4G
Business Benefit: Encourage people to watch youtube more.
+YouTube +YouTube for Developers +Google Developers 

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Personalised TV ads http://ift.tt/1cwldN2 ...

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Personalised TV ads
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Sky rolls out personalised TV ads

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The Guardian: Why Google and other tech giants are creating tools for political dissidents. http://google.com...

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The Guardian: Why Google and other tech giants are creating tools for political dissidents. http://ift.tt/1GTY5iX

Why Google and other tech giants are creating tools for political dissidents | Guardian Sustainable Business | The Guardian

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Search Engine Land: Google Testing “Value Alert” Notice In Google Shopping Ads. http://ift.tt/1eUavJA...

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Search Engine Land: Google Testing “Value Alert” Notice In Google Shopping Ads. http://ift.tt/1GTJO5y

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The Log: What every software engineer should know about real-time data's unifying abstraction https:...

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The Log: What every software engineer should know about real-time data's unifying abstraction
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World Economic Forum: How will the sharing economy change your life? http://ift.tt/1bCpEnS...

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World Economic Forum: How will the sharing economy change your life? http://ift.tt/1bCpEnS

How will the sharing economy change your life?

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Cassandra Data structures Commit log Memtable SSTable loom filters and index LSM tree SnapTree for ...

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Cassandra Data structures
Commit log
Memtable
SSTable
loom filters and index
LSM tree

SnapTree for MemTable representation, which claims to be "A drop-in replacement for ConcurrentSkipListMap, with the additional guarantee that clone() is atomic and iteration has snapshot isolation". See also, copy-on-write and compare-and-swap on the following sites:

Java garbage collectors start to underperform for heap size 8 GB or more
A high-demand row may create a hotspot.

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08.05.2015 06:55

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To kick off our San Francisco series of engineer-to-engineer lectures on new technologies and interesting problems in consumer software, we invited in the Great Alex Payne to talk about how Twitter uses Scala, a programming language that combines traits of object-oriented languages and ...

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Cassandra gossip protocol The basic idea is that a node’s state is not only up or down. It is not true...

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Cassandra gossip protocol
The basic idea is that a node’s state is not only up or down. It is not true or false. Rather, it is an educated guess which takes multiple factors into account. 
Cassandra approximates Phi using exponential distribution. Thus, the higher the Phi, the bigger the confidence that Node B has failed. 

But if other nodes in the system also see that other node is dead then you can with some confidence conclude that that node is dead. 
Stats like load average, free memory, etc. would allow a local node to decide where to send work, for example.
Local nodes make local decisions based on local data. This can scale as far as the gossip protocol can scale.
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The gossip process runs every second and exchanges state messages with up to three other nodes in the cluster. 
The seed node designation has no purpose other than bootstrapping the gossip process for new nodes joining the cluster. 
a node remembers other nodes it has gossiped with between subsequent restarts.
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Phi Accrual Failure Detection is a famous algorithm for distributed computing.

Cassandra uses an accrual detection mechanism to calculate a per-node threshold that takes into account network performance, workload, and historical conditions.

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When building a system on top of a set of wildly uncooperative and unruly computers you have kn...

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Droid Life: Google Might Soon Let You Hand-Pick Permissions When Installing Apps. http://google.com/...

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Droid Life: Google Might Soon Let You Hand-Pick Permissions When Installing Apps. http://ift.tt/1JSPBP4

According to a report out of Bloomberg, Google will introduce pretty cool new privacy controls at Google I/O this month, which is a fancy way of saying that they are about to let you pick and choose which permissions are given to an app before you install it.

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Android Police: Google Drive Expands OCR Capabilities To Read The Text On Scanned Documents In Over ...

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Android Police: Google Drive Expands OCR Capabilities To Read The Text On Scanned Documents In Over 200 Languages. http://ift.tt/1P4xER3

Optical character recognition, also known as OCR, is really an amazing technology. If you aren't familiar, it takes images and reads the text on them. For... by Jacob Long in Applications, Google, News

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Deep dive into Apache Cassandra internals #todo http://ift.tt/1dP8BRu...

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Deep dive into Apache Cassandra internals #todo
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Deep dive into Apache Cassandra internals

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Chrome && Google Playbook: Speak/Read the page for us Some times, we are tired of reading the page and...

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Chrome && Google Playbook: Speak/Read the page for us
Some times, we are tired of reading the page and want someone to read this page for us: it's ever better if it can show what sentence it's current reading visually, and scroll the webpage accordingly,

Chrome Dev in Android provides the experiment view mode which can extract the main content in current web page.

-- Business mode:
A big feature in Google Play Book
Ads?

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CRDT, Bloom Filter, Merkle Tree & HyperLogLog in Cassandra http://ift.tt/1ReTVdA...

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CRDT, Bloom Filter, Merkle Tree & HyperLogLog in Cassandra
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MemtableSSTable
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Hinted handoff is where a request coordinator saves updates that it couldn’t deliver to a replica, to retry later.

anti-entropy
The synchronization of replica data on nodes to ensure that the data is fresh.

Understanding How Cassandra Stores Data
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CRDT, Bloom Filter, Merkle Tree & HyperLogLog in Cassandra

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07.05.2015 05:59

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Recently, Google released 70 new Google Now cards. Here are 10 that professionals can get the most out of.

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Sort user and organization repositories by star count. http://ift.tt/1AGworB...

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Sort user and organization repositories by star count.
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GitHub is the best place to build software together. Over 4 million people use GitHub to share code.

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Time Series with Cassandra Single device per row Partitioning to limit row size adding data to the row...

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Time Series with Cassandra
Single device per row 
Partitioning to limit row size 
adding data to the row key to limit the amount of columns you get per device.
PRIMARY KEY (weatherstation_id,event_time),
Reverse order timeseries with expiring columns: rolling storage
WITH CLUSTERING ORDER BY (event_time DESC);

Insert USING TTL 20;
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Materialized Views
minimizing disk seeks at the cost of higher space consumption is a good tradeoff.
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create table sensor_entries ( 
sensorid uuid, time_taken timeuuid, reading text,  
primary key(sensorid, time_taken)) with compact storage;
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Cassandra is awesome at time seriesCassandra’s data model works well with data in a sequence. That data can be variable in size, and Cassandra handles

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How about build Robots to clean the city? In a city, we can usually see trashes, papers in street So...

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How about build Robots to clean the city?
In a city, we can usually see trashes, papers in street
So how about build Robots to clean the city for us, sell them to the City Government.
The robots collect trashes on ground and put them into nearby trash bin.

Put robots out in morning, and reclaim them on night.
Concern: People may try to steam them:)

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Android Police: Google Will Unveil Voice Access At I/O, Allowing You To Control Apps Entirely By Voice...

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Android Police: Google Will Unveil Voice Access At I/O, Allowing You To Control Apps Entirely By Voice
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Touchscreens are okay, but what about putting those pipes to better use? The description of one of Google's talks at I/O later this month points to an inte... by Ryan Whitwam in Applications, News

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Using Amazon SNS SNS is used for multicast messaging. Consumers subscribe to a "Topic," and messages...

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Using Amazon SNS
SNS is used for multicast messaging. Consumers subscribe to a "Topic," and messages published to the Topic are pushed to all current subscribers
Push Notifications to mobile
Email Msg
SNS Msg in US
Amazon SNS can also deliver messages to Amazon Simple Queue Service (SQS), AWS Lambda functions, or to any HTTP endpoint.
Delivery Status

Java Code Example
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https://www.youtube.com/watch?v=j2FwBbcERVQ
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SQS Queues and SNS Notifications – Now Best Friends
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SNS Mobile Example:
Push Notifications to Mobile Devices Using Amazon SNS
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A Simple HTTP Receiver for Amazon's Simple Notification Service. 15 June 2010. Amazon's Simple Notification Service enables you to publish messages to subscribers in a scalable, cost-effective manner. Notifications can be delivered either to email or HTTP endpoints.

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Adsense for Desktop Application +Google AdSense +Google Ads +Google Ads Developers Users don't mind...

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Adsense for Desktop Application  +Google AdSense +Google Ads +Google Ads Developers 
Users don't mind if they can use the app free and the ads are shown in non-intrusive way
We use a lot of free application and don't mind the devs can earn some money for their hard work, and add more free features.
Users can get more free applications.

How to show ads
If user is connected to network(in most cases), and the application is being used(tis is the hard part)
Then show ads at the bottom of the application periodically: last for several seconds, disappear, after the application is being used for several hours again, show ads again.

Developers can release 2 versions: free but with ad, paid version with no ad
If users don't want ads, pay for it.

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Kafka Examples http://ift.tt/1GYyyYo http://ift.tt/1zLKope...

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Kafka Examples
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Set current language without saving file in Sublime Text Click the Plain Text label at the bottom right...

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Set current language without saving file in Sublime Text
Click the Plain Text label at the bottom right of the window and select your language.
Alternatively, select your language in the menu at View » Syntax, or open your command palette (CtrlShiftP) and type ssjava (equals to Set Syntax: Java).
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I have recently started using Sublime Text 2 after getting tired with Notepad++. Now, if I wanted to set what language I am currently programming in in Notepad++, I would go to the Language menu, and

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Google+: Create Aggregate Collection that put multiple collections about same topic in one place +Google...

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Google+: Create Aggregate Collection that put multiple collections about same topic in one place
+Google+ +Google+ Developers 
If we are interested in one topic and follow multiple collection from different people, we have to go to each collection and check. This is not good.

How about let us create read-only aggregate collection: to put them together, others can also see them, and choose to follow some or all collections from this aggregation collection.

--Collection is a good feature that allows us to group our posts, and follow what we are interested.

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05.05.2015 09:37

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Stanford: Algorithms Part II - YouTube

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Adsense: How about high HD ads for high speed network? +Google AdSense A lot of Ads use pics/photos,...

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Adsense: How about high HD ads for high speed network? +Google AdSense
A lot of Ads use pics/photos, so how about high HD pics for high speed network, low resolution pics for slow network?
-- or first show low hd pics, then download hd pics in background, after complete, switch to high hd pics.
-- Advertiser pay more if they want this feature..
-- Users can disable this feature.

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05.05.2015 04:31

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Scala: The Multi-Paradigm Language for the Multi-Core Age

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Scala: Parallel Collection list.par.map(_ + 42) val parArray = (1 to 1000000).toArray.par parArray.fold...

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Scala: Parallel Collection
list.par.map(_ + 42)
val parArray = (1 to 1000000).toArray.par
parArray.fold(0)(_ + _)
(1 to 1000).toList.par.reduce(+)
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you shouldn’t pay for what you don’t use.
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Aleksandar Prokopec, Heather Miller. Motivation. Amidst the shift in recent years by processor manufacturers from single to multi-core architectures, academia and industry alike have conceded that Popular Parallel Programming remains a formidable challenge. Parallel collections were included in ...

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Google+ & Android: Before make a call, Remind us if the other one is driving +Android +Google+ +Google...

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Google+ & Android: Before make a call, Remind us if the other one is driving +Android +Google+ +Google+ Developers +Android Developers 
We may share our location with our loved ones, and we usually don't want to call them if they are driving. - instead we may choose to text them or call them later if not urgent.

So how about integrate this into Android:
If the other shares location with us and is driving, remind us if the other one is driving before we make a call.
-- User can choose to disable this feature.

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Amazon SQS Point-Point vs Publish-Subscribe: Supports only Point-Point model. No PubSub. Messages are...

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Amazon SQS
Point-Point vs Publish-Subscribe:  Supports only Point-Point model. No PubSub.
Messages are not guaranteed to be delivered in FIFO order.
Messages can be requested in batches with a max batch size of 10 messages.
message consumption by the consumers is not real time due to polling interval.
every request to SQS would incur some cost (1$ for 1million requests).
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That’s sent or received, so really it’s 2 bucks a million. Another thing with SQS: it’s slow.

As a result of at-least-once delivery, consuming services need to make sure that re-processing of messages does not result in an inconsistent state of the system by handling the messages in an idempotent manner.

Where should I use the Amazon SQS service? - Quora

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Redis pub/sub What Redis offers with Pub/Sub is a listener model, where each subscriber receives each...

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Redis pub/sub
What Redis offers with Pub/Sub is a listener model, where each subscriber receives each messages when it is listening, but won’t receive them when not connected.
Redis needs to have as much memory as there are messages in flight.
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What are the advantages of Kafka over Redis for pub-sub? - Quora

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Scala for Java Refugees Part 5: Traits and Types class MyMap[V<:Component] extends HashMap[String,V]...

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Scala for Java Refugees Part 5: Traits and Types
class MyMap[V<:Component] extends HashMap[String,V]
the single type parameter must be a subtype of Component
class MyMap[V:>CollegeStudent] extends HashMap[String,V]
Lower type bounding is when the type parameter is constrained such that a certain type must inherit from the type parameter.
type parameter V can be any type which is extended by CollegeStudent .
Thus the parameter could be Student, Worker or even Person.
val str:String = obj.asInstanceOf[String]
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An upper type bound T <: A declares that type variable T refers to a subtype of type A.
lower type bounds declare a type to be a supertype of another type. The term T >: A expresses that the type parameter T or the abstract type T refer to a supertype of type A.
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case class ListNode[+T](h: T, t: ListNode[T]) {
  def head: T = h
  def tail: ListNode[T] = t
  def prepend[U >: T](elem: U): ListNode[U] =
    ListNode(elem, this)
}

(permanently in beta)

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03.05.2015 22:57

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ETE 2012 - Joshua Suereth - Effective Scala

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Integrate Youtube and Google Now +YouTube Share search and watch history with Google Now, so Google...

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Integrate Youtube and Google Now +YouTube 
Share search and watch history with Google Now, so Google Now(research topics) can recommend us  related and good articles or videos.
Recommend videos in Google Now
-- Be sure that's what user really wants to watch: based on recent search/watch history, user clustering.
-- For selected producers, get the text from the video, analyze them, group them, etc.
-- Don't just show videos based on view count

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Youtube: Know what users really want, focus on work related skills, study, hobbies +YouTube Don't ...

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Youtube:  Know what users really want, focus on work related skills, study, hobbies +YouTube 
Don't just focus on Music or entertainment
We may watch music or some funny videos, but this doesn't motivate us to open youtube to check.

Separate entertainment from work
I only listen to music during brushing in the morning, I really don't care about music at all, so I don't want Youtube to show recommended music or entertainment related videos in what to watch tab. 
If I want to watch music, I will click the music tab and play one of the Mixes.

There are really a lot of videos that I want to watch in youtube: programming, algorithm, system design, but it's really hard to find them and sometimes, we don't even know what we want to learn(that's the meaning of recommendation or why Google Now Rocks)

It's also not fair when I see these great videos with only hundreds or thousand viewer.

Youtube should encourage these kind of high quality videos
The producers don't have to take time to advertise them: as long as they are good videos of some kind of group users, youtube will help them and recommend them to the right users.

I don't really mind watching some or more ads, as long as Youtube can really help me grow my skills.
So, Youtube, please help the users and the producers.

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Youtube: Auto Categorize(Label) Liked videos +YouTube Like is useful and important information: It's...

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Youtube: Auto Categorize(Label) Liked videos +YouTube
Like is useful and important information:
It's useful data for youtube: so youtube knows what user like, and can give better recommendation.

It may also mean it's a good video with high quality, and some other users with same interest may also like and want to watch it: so we may recommend it to this group.

So youtube should encourage users to click like.

But if youtube just puts all liked videos into one list: there is no much value to user: say there is 1k liked videos for a user...

Socialize and more watch
We can view and discover other's auto categorized liked video playlist: for example(programming, algorithm, etc), and watch them.

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