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Instaclustr webinar 2017 feb 08 japan
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2017年2月8日(水)日本Cassandra コミュニティ向けWebinarのプレゼンテーション資料です。
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Instaclustr webinar 2017 feb 08 japan
1.
© 2017 Instaclustr
copyright. 1 Processing 50,000 Transactions per Second with Apache Spark and Apache Cassandra
2.
© 2017 Instaclustr
copyright. 2 Introduction • Ben Slater, Chief Product Officer, Instaclustr • Cassandra + Spark Managed Service, Support, Consulting • DataStax MVP for Apache Cassandra
3.
© 2017 Instaclustr
copyright. 3 Processing 50,000 events per second with Cassandra and Spark 1 Problem background and overall architecture 2 Implementation process & lessons learned 3 What’s next?
4.
© 2017 Instaclustr
copyright. 4 Problem background • How to efficiently monitor >600 servers all running Cassandra • Need to develop a metric history over time for tuning alerting & automated response systems • Off the shelf systems are available but: • probably don’t give us the flexibility we want to be able to optimize for our environment • we wanted a meaty problem to tackle ourselves to dog-food our own offering and build our internal skills and understanding
5.
© 2017 Instaclustr
copyright. 5 Solution Overview Managed Node (AWS) x many Managed Node (Azure) x many Managed Node (SoftLayer) x many Cassandra + Spark (x15) Riemann (x3) RabbitMQ (x2) Console/ API (x2) Admin Tools 500 nodes * ~2,000 metrics / 20 secs = 50k metrics/sec PagerDuty
6.
© 2017 Instaclustr
copyright. 6 Implementation Approach 1.Writing Data 2.Rolling Up Data 3.Presenting Data ~ 9(!) months (with quite a few detours and distractions)
7.
© 2017 Instaclustr
copyright. 7 Writing Data • Key lessons: • Aligning Data Model with DTCS • Initial design did not have time value in partition key • Settled on bucketing by 5 mins • Enables DTCS to work • Works really well for extracting data for roll-up • Adds complexity for retrieving data • When running with STCS needed unchecked_compactions=true to avoid build up of TTL’d data • Batching of writes • Found batching of 200 rows per insert to provide optimal throughput and client load • See Adam’s C* summit talk for all the detail • Controlling data volumes from column family metrics • Limited, rotating set of CFs per check-in • Managing back pressure is important
8.
© 2017 Instaclustr
copyright. 8 Rolling Up Data • Developing functional solution was easy, getting to acceptable performance was hard (and time consuming) but seemed easy once we’d solved it • Keys to performance? • Align raw data partition bucketing with roll-up timeframe (5 mins) • Use joinWithCassandra table to extract the required data – 2-3x performance improvement over alternate approaches val RDDJoin = sc.cassandraTable[(String, String)]("instametrics" , "service_per_host") .filter(a => broadcastListEventAll.value.map(r => a._2.matches(r)).foldLeft(false)(_ || _)) .map(a => (a._1, dateBucket, a._2)) .repartitionByCassandraReplica("instametrics", "events_raw_5m", 100) .joinWithCassandraTable("instametrics", "events_raw_5m").cache() • Write limiting (eg cassandra.output.throughput_mb_per_sec) not necessary as writes << reads
9.
© 2017 Instaclustr
copyright. 9 Presenting Data • Generally, just worked • Main challenge was dealing with how to find latest data in buckets when not all data is reported in each data set
10.
© 2017 Instaclustr
copyright. 10 Optimisation w Cassandra Aggregation • Upgraded to Cassandra 3.7 and change code to use Cassandra aggregates: val RDDJoin = sc.cassandraTable[(String, String)]("instametrics" , "service_per_host") .filter(a => broadcastListEventAll.value.map(r => a._2.matches(r)).foldLeft(false)(_ || _)) .map(a => (a._1, dateBucket, a._2)) .repartitionByCassandraReplica("instametrics", "events_raw_5m", 100) .joinWithCassandraTable("instametrics", "events_raw_5m", SomeColumns("time", "state", FunctionCallRef("avg", Seq(Right("metric")), Some("avg")), FunctionCallRef("max", Seq(Right("metric")), Some("max")), FunctionCallRef("min", Seq(Right("metric")), Some("min")))).cache() • 50% reduction in roll-up job runtime (from 5-6 mins to 2.5-3mins) with reduced CPU usage
11.
© 2017 Instaclustr
copyright. 11 What’s Next • Investigate: • Use Spark Streaming for 5 min roll-ups rather than save and extract • Scale-out by adding nodes is working as expected • Continue to add additional metrics to roll-ups as we add functionality • Plan to introduce more complex analytics & feed historic values back to Reimann for use in alerting
12.
© 2017 Instaclustr
copyright. 12 Questions? Further info: • Scaling Riemann: https://www.instaclustr.com/blog/2016/05/03/post-500-nodes-high-availability-scalability-with-riemann/ • Riemann Intro: https://www.instaclustr.com/blog/2015/12/14/monitoring-cassandra-and-it-infrastructure-with-riemann/ • Instametrics Case Study: https://www.instaclustr.com/project/instametrics/ • Multi-DC Spark Benchmarks: https://www.instaclustr.com/blog/2016/04/21/multi-data-center-sparkcassandra-benchmark-round-2/ • Top Spark Cassandra Connector Tips: https://www.instaclustr.com/blog/2016/03/31/cassandra-connector-for-spark-5-tips-for-success/ • Cassandra 3.x upgrade: https://www.instaclustr.com/blog/2016/11/22/upgrading-instametrics-to-cassandra-3/
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