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1312 high scalability-2012-08-27-Zoosk - The Engineering behind Real Time Communications


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Introduction: This is a guest post by Peter Offringa, VP of engineering at Zoosk . Zoosk is a 50 million member romantic social network. Our members get the most rewarding experience from Zoosk when they can interact in real-time. After all, a future relationship is potentially at the other end of every connection a user makes. The excitement and richness of this situation can only be fully realized in real-time. The suite of Zoosk services facilitating these interactions are referred to by the general description of real-time communications (RTC). These communications are delivered using the XMPP protocol, which also powers other popular instant messaging products. Zoosk members experience real-time communications within three distinct interactions: Presence .  When a member is actively connected to the Zoosk RTC infrastructure, their public status appears as ‘available’. If they are idle for a period of time, their state transitions to ‘away’. Their presence automatically changes to


Summary: the most important sentenses genereted by tfidf model

sentIndex sentText sentNum sentScore

1 The Zoosk service utilizes these notification packets to tell the client applications to update the value of UI-related badges, such as the number of unread messages from another user. [sent-17, score-0.312]

2 If two users are online simultaneously, they can send messages to each other in a familiar ‘instant messaging’ chat format. [sent-19, score-0.293]

3 Message content is also persisted to a database for future message history retrieval if the user reconnects in the future using a different client application. [sent-21, score-0.305]

4 Full Size A user’s online state is tracked in real-time by the Tigase servers via persistent connections between Tigase and the client applications (web browser, mobile device, desktop application). [sent-36, score-0.521]

5 Many core Zoosk product features, including search results, profile views and messaging, require ensuring that this state is reflected in near real-time on all client applications. [sent-37, score-0.386]

6 To keep this state consistent throughout the rest of the Zoosk infrastructure, the user’s record in the user database is updated to reflect their current online state including a timestamp of their most recent online transition. [sent-38, score-0.772]

7 The user’s online state is also stored in cache on our search infrastructure, so that search results can take online state into account. [sent-39, score-0.741]

8 This cache of online state is updated in real-time through a dedicated Tigase instance referred to as the Online State Manager (OSM). [sent-42, score-0.381]

9 The OSM receives custom XMPP packets indicating the user’s online state from the primary Tigase chat servers and then makes a network call to update the ehcache instance on each of the SOLR servers. [sent-43, score-0.56]

10 There are roughly 8,000 of these online state transitions a minute during peak traffic. [sent-44, score-0.338]

11 Maintaining this cache outside of the SOLR index allows the user’s presence state to be updated in real-time, separate from the periodic index replication snaps from master to slave. [sent-45, score-0.295]

12 The user’s presence state is then combined with search results at query time to either filter or rank results based on whether the user is online currently. [sent-46, score-0.694]

13 User interactions with the Zoosk service outside of the core RTC features can also trigger business logic that generates a real-time notification to a connected user. [sent-48, score-0.275]

14 For example, if another user views our user’s profile, or accepts our user’s friend request, we want to notify our user of that action immediately. [sent-49, score-0.357]

15 The PHP-based web application will trigger an asynchronous job that opens a network connection to a Tigase server and passes an XMPP data packet to the server, with a custom message payload providing the data for the notification. [sent-50, score-0.332]

16 This packet is processed by Tigase and routed to the client application from which user is currently connected. [sent-51, score-0.377]

17 The user’s client application then processes this custom packet and displays the appropriate “toast” to the user or updates a “badge” reflecting the current value of a particular feature indicator (number of profile views, unread messages, etc. [sent-52, score-0.575]

18 If the user is offline at the time, Tigase will store the packet until the user reconnects. [sent-54, score-0.401]

19 It logs into all primary chat servers and tests connections and presence transmission. [sent-60, score-0.375]

20 Business Intelligence Reports - Every hour, a script checks the number of active connections to each primary Tigase server and the number of messages it has passed in the prior hour. [sent-65, score-0.39]


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tfidf for this blog:

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