Hive - Data Warehousing & Analytics on Hadoop
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The document provides an overview of Hive, a data warehousing system built on Hadoop. It discusses how Hive is used at Facebook to manage large amounts of data, provides details on Hive's architecture and query language, and outlines ongoing work to improve performance and expand functionality.
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Hive - Data Warehousing & Analytics on Hadoop
- 1. Hive - Data Warehousing & Analytics on Hadoop Wednesday, June 10, 2009 Santa Clara Marriott Namit Jain, Zheng Shao Facebook
- 11. Data Warehousing at Facebook Today Facebook Web Servers Scribe Servers Filers Hive on Hadoop Cluster Oracle RAC Federated MySQL
- 16. Data Model Facebook Logical Partitioning Hash Partitioning clicks HDFS MetaStore /hive/clicks /hive/clicks/ds=2008-03-25 /hive/clicks/ds=2008-03-25/0 … Tables Metastore DB Data Location Bucketing Info Partitioning Cols
- 17. HIVE: Components Facebook HDFS Hive CLI DDL Queries Browsing Map Reduce MetaStore Thrift API SerDe Thrift CSV JSON.. Execution Parser Planner Web UI Optimizer DB
- 22. Map Reduce Example Facebook Machine 2 Machine 1 <k1, v1> <k2, v2> <k3, v3> <k4, v4> <k5, v5> <k6, v6> <nk1, nv1> <nk2, nv2> <nk3, nv3> <nk2, nv4> <nk2, nv5> <nk1, nv6> Local Map <nk2, nv4> <nk2, nv5> <nk2, nv2> <nk1, nv1> <nk3, nv3> <nk1, nv6> Global Shuffle <nk1, nv1> <nk1, nv6> <nk3, nv3> <nk2, nv4> <nk2, nv5> <nk2, nv2> Local Sort <nk2, 3> <nk1, 2> <nk3, 1> Local Reduce
- 24. Hive QL – Join in Map Reduce Facebook page_view user pv_users Map Reduce key value 111 < 1, 1> 111 < 1, 2> 222 < 1, 1> pageid userid time 1 111 9:08:01 2 111 9:08:13 1 222 9:08:14 userid age gender 111 25 female 222 32 male key value 111 < 2, 25> 222 < 2, 32> key value 111 < 1, 1> 111 < 1, 2> 111 < 2, 25> key value 222 < 1, 1> 222 < 2, 32> Shuffle Sort Pageid age 1 25 2 25 pageid age 1 32
- 26. Hive QL – Map Join Facebook page_view user Hash table pv_users key value 111 <1,2> 222 <2> pageid userid time 1 111 9:08:01 2 111 9:08:13 1 222 9:08:14 userid age gender 111 25 female 222 32 male Pageid age 1 25 2 25 1 32
- 28. Hive QL – Group By in Map Reduce Facebook pv_users Map Reduce pageid age 1 25 1 25 pageid age count 1 25 3 pageid age 2 32 1 25 key value <1,25> 2 key value <1,25> 1 <2,32> 1 key value <1,25> 2 <1,25> 1 key value <2,32> 1 Shuffle Sort pageid age count 2 32 1
Notas del editor
- What is this? This is huge amount of data. Along with the fast growth of active users on Facebook, the size of our data is exploding. In the last 12 months, the amount of data increased by 500%. These data are very valuable. They can be used to understand the user behavior, measure the impact of a new product, and make data-based decisions. Traditionally people store data in data warehouse solutions on top of Oracle and MySQL. In the recent years, we are also seeing new proprietary solutions like AsterData and Netezza. However, these solutions either do not scale to the amount of data that we have, or they are very inflexible that cannot satisfy our data analysis requirements. In order to provide the capability to analyze the huge amount of data that we have, we started the Hive project. Hive is based on Hadoop but does much more than Hadoop. We will show the details in the following slides. ============