Making the Most of Hadoop with Optimized Data Compression (and Boost Performance) Mark Cusack. Chief Architect RainStor
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2 Making the Most of Hadoop with Optimized Data Compression (and Boost Performance) Mark Cusack Chief Architect RainStor
3 Agenda Importance of Hadoop + data compression Data compression techniques Compression, projection and filtering for faster analytics Boost performance by avoiding the Map-Reduce layer
4 Introducing Hadoop Hadoop is a scalable and reliable platform for storing and processing Big Data Hive Pig Map-Reduce SQL HBase HDFS
5 Multi-Structured Data Management Tabular Key Value Blob/Clob Relational Event logs XML Documents Binary Objects
6 Hadoop - The Price of Scalability and Reliability 3x data replication for availability I/O bound operations, and CPU under-utilization Heavyweight Map-Reduce framework Larger cluster sizes More Admin & More Cost
7 Why Data Compression is Important Reduces cluster size and boosts efficiency Reduces network and disk IO Increases CPU utilization Lowers impact of replication and shuffle Compress data at rest in HDFS Compress data between Map-Reduce tasks Compress output result sets
8 Compression Techniques General purpose compression libraries: Bzip2, Gzip, LZO, Snappy, LZ4 Applies to all data types Column-oriented compression: Hive columnar file format Proprietary data de-duplication Applies to structured data
9 Column-Oriented Compressed File Formats Structured data stored in a column-wise order Values in the same column are often related Related values are localized on disk Generic compression algos are more effective Column-level de-duplication can be applied Direct access to columns of interest Projections Reduces IO overhead for analytics workloads
10 Example: Compression of FS Stock Quote Data X 11X 14X 23X LZO GZIP BZIP2 Structured data de-duplication Ratios vs uncompressed source data
11 Structured Data De-duplication 0001 GOOG P Z YHOO 0004 No re-inflation
12 Hadoop Use Case: Data Warehouse Archiving Data Warehouse [Ingest ½ TB 10TB /Day] Sources: 6,000 DBs Re-instate From Tape 500 TB 20x Compression 10 Years 2PB Applies structured data de-duplication Large bank manages Petabyte data on Hadoop for lower cost analysis and compliance Data warehouse too costly to scale (2 years of data = 500TB) Eliminate Offline tape
13 Boosting Analytics Performance using Filtering Data often has a natural order: Database transactions ordered by timestamp Or data may have an order imposed on it: Stock quotes partitioned by ticker symbol Order can be used to filter out tasks Only process data in the window of interest
14 Static Dynamic Filter for Performance Pig statement FILTER quotes BY symbol == GOOG AND exchange == P ; Bloom Filter P P P P P P HDFS P P P P P P
15 Map-Reduce Framework is Heavyweight Hadoop is best suited to batch analytics Task scheduling takes a few seconds HBase achieves fast performance by avoiding Map-Reduce layer Some SQL DBs can also run on HDFS Implement their own compute frameworks HDFS used as a scalable storage platform
16 Hadoop and Data Warehouses are Converging Data Warehouse Low Latency Analytics Costly to Scale Built upon SQL Standards Batch Analytics Low Cost Immature BI Support + SQL Hybrid SQL-Hadoop Technologies Bridge the Gap
17 Minutes Example: FS Stock Quote Data Analysis Batch (all symbols) Ad-hoc (single symbol) hrs hrs hr 20 mins mins 2 mins 8 seconds 0 0 Uncompressed MR All Data Dedup + Project MR All Data Dedup + Project SQL All Data Dedup + Uncompressed Project MR All Data MR w/ Filter Dedup + Project SQL w/filter Query Test: Calculate the average daily quote price for ticker symbols for one day across 1.5 billion quotes
18 Summary Structured data compression increases storage capacity and cluster efficiency Compression is an IO bandwidth multiplier Filtering and projection can significantly boost the performance of Map-Reduce tasks Only load and process the data required The new breed of SQL on Hadoop databases provide: Faster query response times than standard Hadoop Full access to enterprise-grade Business Intelligence tools
19 Questions? Mark Cusack
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