1 Evaluation of NoSQL databases for large-scale decentralized microblogging Cassandra & Couchbase Alexandre Fonseca, Anh Thu Vu, Peter Grman Decentralized Systems - 2nd semester 2012/2013 Universitat Politècnica de Catalunya
2 Microblogging Blogging with very small & concise posts. Users subscribe to others by following them. Real-time interactions between growing userbase. Useful for: Real-time updates & news. Marketing and public relations campaigns. Research into social interaction & perception. Examples: Twitter, Tumblr, identi.ca, Facebook & Google+ status updates.
3 Microblogging - decentralization Twitter: Over 500 million registered users. 340 million tweets per day. More than 12TB of data per day in Hard to provide this service relying solely on a small number of centralized servers. Scaling up has its limits.
4 Microblogging - decentralization 2 possible ways to decentralize: Decentralize dedicated servers managed by the service provider - better load sharing. Allow users to share the system load between them (similar to voluntary computing).
5 Relational Database Systems (RDS) Typical enterprise and service data storage. Tables and table rows as storage units. Highly normalized. Storage divided into entity types. One table per entity type. One row per entity instance. Many-to-many relationship tables. Transaction support for maximum consistency.
6 RDS - Twitter Example Tweets Users ID Name Password ID PosterID Time Body 1 Alex ********* Burguer 2 Casey ********* Nutella 3 Peter ********* Beer JOIN Followers ID Follows Timeline for User Alex Tweet ID Poster Time Body 2 Casey Nutella 3 Peter Beer
7 NoSQL New (or is it?) data storage paradigm: KISS. Simple key-value stores in its essence. (Usually) no transaction control or strict schemas. Incentive denormalization. Let the application worry about business logic and entity relationships. Focus on: Flexibility (of schemas, topologies, configurations) Scalability Robustness Performance
10 Cassandra Initially developed by Facebook. Released in Apache Top-Project by Latest stable release (1.2.4, April 2013) Data model: Hybrid between key-value and tabular storage. Data split in column families (like RDS tables). Column families split into rows (indexed by row keys). Dynamic columns (schema). Interface: CQL via Thrift.
11 Cassandra All database nodes play the same role. Nodes divided into variable number of virtual nodes: Organized into ring structure. Assigned tokens determine data assignment: Consistent hashing of partition key (1st column of primary key). Hashing can be parametrized. Cluster can be given topology awareness: Try to keep request resolution local to rack or datacenter. Replicate data over different data centers and racks. Replication and consistency options all configurable.
12 Couchbase = + Current release v2.0.1 (Apr 9, 2013)
13 Couchbase Key - Value Key: string, no space allowed, 250 bytes limit Value: JSON document, integer or serializable byte stream, 20MB limit View: MapReduce: to index all data Incrementally and periodically updated
14 Couchbase All nodes play the same role A bucket (or database) is divided into small subsets, called vbuckets distributed in the cluster. Replication factor: configurable for each bucket with a max of 3. Consistency: Strong consistency for access with "key" Eventual consistency for queries on views
15 PyDLoader Custom Python script 2 components: Manager: Interactive console. Deploy new nodes. Install and control slaves on those nodes. Slaves: Automatic setup, populating and takedown of database clusters (database slaves). Generation of application workload towards database clusters (workload slaves). Used libraries: Boto (AWS), Paramiko (SSH), RpyC (RPC).
16 Evaluation Done using Amazon Web Services (AWS). 6 database nodes (m1.small) 1.7 GB of RAM 1 compute unit 150GB of storage 12 workload nodes (t1.micro) 615 MB or RAM 1 compute unit No local storage (NAS) Distributed equally over 2 datacenters in Ireland.
17 Evaluation Focus on 3 main operations: Tweet Userline (all tweets by user) Timeline (all tweets by people user is following). Limit to 50 items per userline/timeline. Basic data structure: Aggregate data according to operations, not entities: Timeline table/bucket: UserID, TweetID, PostedBy, Body Userline table/bucket: UserID, TweetID, Body
18 Ease of Setup Cassandra - Awesome! Install, configure addresses, partitioner, snitch, replication factors and seed nodes, launch! Automatic partitioning and replication. Automatic adjustment to churn. Couchbase - Equivalently Awesome! Install, configure RAM, directory, launch! Easily add/failover/remove servers Rebalance: background process, asynchronous, incremental Automatic replication, partitioning and node failure detection.
19 Setup time Cassandra: 6 nodes form and stabilize ring after ~2 minutes. Populating with sample data: ~1 minute in 1 node configuration. 6.5 minutes in 6 node configuration. Couchbase: 6 nodes form and stabilize ring after ~2 minutes. Populating with sample data: ~1 minute in 1 node configuration. ~2 minutes in 6 node configuration.
24 Tweets & Denormalization Tweet Latency v.s. Number of Followers
25 Tweets & Denormalization Immediate denormalization not scalable. How to make asynchronous? Cassandra: No native support. External processing. Couchbase: Views!
26 Reconfiguration Latency Cassandra Adding a new node to a cluster: ~5 mins. Latency while node joining cluster
27 Reconfiguration Latency Couchbase Adding a new node to a cluster: immediate BUT rebalance ~ 30 mins Latency while node joining cluster
28 Consistency/Convergence Cassandra: Average of seconds to detect new tweet. Standard deviation of : Same datacenter => very fast detection. Different datacenter => slower detection. Couchbase: Average of seconds to detect new tweet with standard deviation of The delay for new tweet to appear on timeline proportional to the schedule period
29 Replication Cassandra: Very flexible in terms of replication configuration. Per datacenter replication factors with no hard-coded limitations. Behaviour under crash of 2 second 100th
30 Replication Couchbase Automatic and configurable per bucket with a limit of (1+3) replicas. Behaviour under crash of 2 second 30th, 100th
31 Load Balancing Cassandra: Average data ownership per node: 16.68% Standard deviation: 1.23% Couchbase: Evenly distributed with standard deviation: 0.65% for data on disk 0.04% for RAM usage
32 System Load CPU Idle Time Free Memory
33 System Load Disk IO
34 Disk Space Usage SQLite database: 1.6MB Cassandra: Fully denormalized (single node): 16.31MB. Fully denormalized (6-nodes): 9.5MB/node. Includes partitioning and replication. "Normalized" (no body in userline/timeline): Single node: 2.8MB 6-nodes: 1.6MB/node. Commit log after populating: 54MB Need 50% of free disk space at all times: Column family compactions. Data redistributions.
35 Disk Space Usage Couchbase: Total of 250MB distributed across 6 nodes. No minimum free space requirement. Lack of disk usage limitations in both DBs: Not ideal for voluntary computing systems.
36 Conclusion Easy cluster setup Allows horizontal scaling over multiple nodes Improved performance through denormalization Higher storage requirements The future is hybrid A mix of RDS and NoSQL-Systems Cassandra's CQL, CouchBase's Views, NoSQL in RDS
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