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SortaSQL
 

SortaSQL

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CloudFlare looked at several NoSQL and SQL solutions and ended up with a hybrid model where many Kyoto Cabinet DBs are accessed via a Postgres wrapper. This presentation describes the resulting novel ...

CloudFlare looked at several NoSQL and SQL solutions and ended up with a hybrid model where many Kyoto Cabinet DBs are accessed via a Postgres wrapper. This presentation describes the resulting novel architecture which combines the horizontal scalability of NoSQL solutions with the flexibility and stability of SQL.

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  • Hi, I’m ian and I’m going to be talking about a db project that I’ve been working on at CloudFlare\n
  • What is CF. Web access logs -- who did what\n
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  • Hbase not a good match for us.\n
  • Instead of buying more hardware, we decided to get fancy. A lot like hbase and hadoop.\n
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  • Go fast here\n
  • go slow here\n
  • I’m now going to try and convince you that this is not just a CF specific tool, but general purpose.\nIe, just like bigtable\n
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  • compound index leading to a set of counters (key/value pairs)\n
  • how seen in the db -- given owner, period, data type, recover rows using a kcx function \n
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SortaSQL SortaSQL Presentation Transcript

  • SortaSQLIan Pye <ian@cloudflare.com>
  • Motivation
  • Everyone likes SQL• Tables• Joins• Online Transaction Processing• Transactions!• Arbitrary Queries
  • Scaling?• What happens to joins when your data doesn’t fit in memory?• I only need get and set for my data• Sharding is too hard/unreliable• A “monopolistically competitive market”?
  • ScalingSeamless Horizontal Scalability from 1 to N
  • Proposal: Let the Filesystem do the hard work• RDBMS presents a full SQL interface to applications, automatically accessing files to get data as needed• RDBMS stores metadata allowing it to find the right data files• Embedded key/value store handles the record level storage, locking, caching, etc.• FS (local or distributed) stores data and is responsible for replication, performance, locking, etc.
  • Major Wins• Scales continuously from 1-100 servers (FS permitting)• Hot/cold storage hierarchy• Allows ad-hoc queries via mature SQL• Everyone already has built in bindings
  • Architecture• Application Talks SQL to PostgreSQL• PostgreSQL stores metadata• Performs post processing on rows retrieved from KC files• KC files live on a POSIX filesystem
  • Architecture Application SQL PostgreSQL SortaSQL Plugin libKC libKC libKC libKC Kyoto Kyoto Kyoto KyotoCabinet Cabinet Cabinet Cabinet Filesystem Filesystem
  • Big Table“A Bigtable is a sparse, distributed, persistent multidimensional sorted map.”
  • Multi-Dimensional • Storing values as protocol buffers allow for arbitrarily complex maps • Logic so that when maps get too big, they are promoted to top level KC stores
  • Persistent and Sorted• Any Key/Value store which allows for binary values accessed via a B+Tree of keys will do• We use Kyoto Cabinet (successor to Tokyo Cabinet)
  • Sparse• Values can be arbitrarily different.• NULLs are free (or cheap)• Protocol Buffers again to the rescue.
  • Distributed• All about the filesystem here
  • Sharding Made Easy• Fine grained metadata allowed for efficient storage hierarchy
  • SortaSQL: Summery• BigTable like structure• Accessed via SQL (PHP bindings come for free!)• Offload the hard part to the Filesystem Folks
  • Case Study: CloudFlare• 400 GB data/day (Medium Data?) • Facebook = 25 TB data/day • USPS = 25.6 GB text data delivered/day• Mix of Flash and Magnetic storage• Mirrored• Fixed user queries• Random BizDev queries
  • Data Scheme
  • MetadataPartitioned by owner, period and data type
  • Disk Layout• 2 80GB SSDs (small and blazing)• 2.5T RAID5 (big and slow)
  • Disk Layout
  • First Steps(access some records)
  • Silly SQL Tricks
  • Window Functions are Your Friends
  • NoSQL to MySQL with Memcached • Replace Language not Storage Engine • Speak Memcached not SQL
  • In Context• https://github.com/cloudflare/SortaSQL• http://dev.mysql.com/tech-resources/articles/ nosql-to-mysql-with-memcached.html• http://queue.acm.org/detail.cfm?id=1961297