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Pinot: Realtime Distributed OLAP datastore

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Pinot is a realtime distributed OLAP datastore, which is used at LinkedIn to deliver scalable real time analytics with low latency. It can ingest data from offline data sources (such as Hadoop and flat files) as well as online sources (such as Kafka). Pinot is designed to scale horizontally.

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  • heal from broken heart" Love spell from dr.Unity brought my husband back"contact Unityspelltemple@gmail.com to help you get your Ex lover back urgently after breakup/divorce" After 12years of marriage, me and my husband has been into one quarrel or the other until he finally left me and moved to California to be with another woman. I felt my life was over and my kids thought they would never see their father again. i tried to be strong just for the kids but i could not control the pains that torments my heart, my heart was filled with sorrows and pains because i was really in love with my husband. Every day and night i think of him and always wish he could come back to me, I was really worried and i needed help, so i searched for help online and I came across a website that suggested that Dr Unity can help get ex back fast. So, I felt I should give him a try. I contacted him and he told me what to do and i did it then he did a Love spell for me. 11hours later, my husband really called me and told me that he miss me and the kids so much, So Amazing!! So that was how he came back that same day,with lots of love and joy,and he apologized for his mistake,and for the pain he caused me and the kids. Then from that day,our Marriage was now stronger than how it were before, All thanks to Dr Unity. he is so powerful and i decided to share my story on the internet that Dr.Unity is real spell caster who i will always pray to live long to help his children in the time of trouble, if you are here and you need your ex lover back or save your marriage fast. Do not cry anymore, contact this powerful spell caster Dr.Unity now. Here’s his contact: Call/WhatsApp him: +2348071622464 ,Email him at: Unityspelltemple@gmail.com , Website:https://unityspellstemple.blogspot.com ,Your kindness will never be forgotten.
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Pinot: Realtime Distributed OLAP datastore

  1. Pinot Kishore Gopalakrishna Tuesday, August 18, 15
  2. Agenda • Pinot @ LinkedIn - Current • Pinot - Architecture • Pinot Operations • Pinot @ LinkedIn - Future Tuesday, August 18, 15
  3. WVMP Tuesday, August 18, 15
  4. Slice and Dice Metrics Tuesday, August 18, 15
  5. Pinot @ LinkedIn Customers Members Internal tools Tuesday, August 18, 15
  6. • 100B documents • 1B documents ingested per day • 100M queries per day • 10’s of ms latency • 30 tables in prod, 250 * 3 std app nodes Pinot @ LinkedIn Tuesday, August 18, 15
  7. Key features SQL-like interface Columnar storage and indexing Real-time data load Tuesday, August 18, 15
  8. (S)QL: Filters and Aggs SELECT count(*) FROM companyFollowHistoricalEvents WHERE entityId = 121011 AND 'day' >= 15949 AND 'day' <= 15963 AND paid = 'y’ AND action = 'stop' Tuesday, August 18, 15
  9. (S)QL: Group By SELECT count(*) FROM companyFollowHistoricalEvents WHERE entityId = 121011 AND 'day' >= 15949 AND 'day' <= 15963 AND paid = 'y’ GROUP BY action Tuesday, August 18, 15
  10. (S)QL: ORDER BY and LIMIT SELECT * FROM companyFollowHistoricalEvents WHERE entityId = 121011 AND entityId = 1000 AND action = 'start' ORDER BY creationTime DESC LIMIT 1 Tuesday, August 18, 15
  11. Whats not supported • JOIN: unpredictable performance • NOT A SOURCE OF TRUTH • Mutation Tuesday, August 18, 15
  12. Pinot • Data flow • Query Execution • How to use/operate • Pinot @ LinkedIn - Future Tuesday, August 18, 15
  13. Broker Helix Real time Historical Kafka Hadoop Pinot Architecture Queries Raw Data Tuesday, August 18, 15
  14. Pinot • Pinot segments Tuesday, August 18, 15
  15. Pinot Segment layout: Columnar storage Tuesday, August 18, 15
  16. Pinot Segment layout: Sorted Forward Index Tuesday, August 18, 15
  17. Pinot Segment layout: Other techniques • Indexes: Inverted index, Bitmap, RoaringBitmap • Compression: Dictionary Encoding, P4Delta • Multi Valued columns, skip lists, • Hyperloglog for unique • T-digest for Percentile, Quantile Tuesday, August 18, 15
  18. Data aware pre-computation Star tree Index Tuesday, August 18, 15
  19. Pinot • Query Execution Tuesday, August 18, 15
  20. Pinot Query Execution: Distributed Servers S1 S3 S2 S1 S3 S2 Helix Brokers Tuesday, August 18, 15
  21. Pinot Query Execution: Distributed Servers 1.Query S1 S3 S2 S1 S3 S2 Helix Brokers Tuesday, August 18, 15
  22. Pinot Query Execution: Distributed Servers 1.Query S1 S3 S2 S1 S3 S2 Helix 2. Fetch routing table from HelixBrokers Tuesday, August 18, 15
  23. Pinot Query Execution: Distributed Servers 1.Query S1 S3 S2 S1 S3 S2 Helix 2. Fetch routing table from HelixBrokers 3. Scatter Request Tuesday, August 18, 15
  24. Pinot Query Execution: Distributed Servers 1.Query S1 S3 S2 S1 S3 S2 Helix 2. Fetch routing table from HelixBrokers 3. Scatter Request 4. Process Request & send response Tuesday, August 18, 15
  25. Pinot Query Execution: Distributed Servers 1.Query S1 S3 S2 S1 S3 S2 Helix 2. Fetch routing table from HelixBrokers 3. Scatter Request 4. Process Request & send response 5. Gather Response Tuesday, August 18, 15
  26. Pinot Query Execution: Distributed Servers 1.Query S1 S3 S2 S1 S3 S2 Helix 2. Fetch routing table from HelixBrokers 3. Scatter Request 4. Process Request & send response 5. Gather Response 6. Return Response Tuesday, August 18, 15
  27. Pinot Query Execution: Single Node Architecture EXECUTION ENGINE INVERTED INDEX BITMAP INDEX COLUMN FORMAT PLANNER Tuesday, August 18, 15
  28. Pinot Query Execution: Single Node Architecture SELECT campaignId, sum(clicks) FROM Table A WHERE accountId = 121011 AND 'day' >= 15949 GROUP BY campaignId account Id daycampaign Id click Filter Operator Projection Operator Aggregation Group by Operator Combine Operator Pinot Segments Data sources Matching doc ids campaignId,Click tuple Tuesday, August 18, 15
  29. Pinot • Operations Tuesday, August 18, 15
  30. Cluster Management: Deployment Helix Brokers Servers • Brokers and Servers register themselves in Helix • All servers start with no use case specific configuration Controller Tuesday, August 18, 15
  31. On boarding new use case Helix Brokers Servers XLNT XLNT XLNT Create Table command Controller XLNT XLNTTag Servers TableName Brokers 3 XLNT_T1 1 Tuesday, August 18, 15
  32. Segment Assignment Servers S3 S2 S1 Upload Segment S2 S1 S3 S2 S1 S3 Helix Brokers Copies TableName 2 XLNT_T1 Controller Tuesday, August 18, 15
  33. • AUTO recovery mode: Automatically redistribute segments on failure/addition of new nodes • Custom mode: Run in degraded mode until node is restarted/replaced. Pinot - Fault tolerance/Elasticity Tuesday, August 18, 15
  34. Pinot vs Druid Druid Pinot Architecture Realtime + Offline, Realtime only Realtime + Offline Realtime only -> consistency is hard and schema evolution/Bootstrap is hard Inverted Index Always On all columns, Fixed Configurable on per column basis Allows trade off between scanning v/s inverted index + scanning. More data can be fit in given memory size Data organization N/A Sorts data Organizing data provides speed/better compression and removes the need for inverted index Smart pre- materialization N/A star-tree Allows trade off between latency and space Query Execution Layer Fixed Plan Split into Planning and execution Smart choices can be made at runtime based on metadata/query. Tuesday, August 18, 15
  35. • Documentation & tooling • In progress - consistency among real time replicas. • Improve cost to serve - leverage SSD, partial pre materialization • ThirdEye - Business Metrics Monitoring Pinot - Future Tuesday, August 18, 15
  36. Thank You 30 Tuesday, August 18, 15

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