PhD Seminar • Data Systems — Real-Time LSM-Trees for HTAP WorkloadsExport this event to calendar

Wednesday, January 13, 2021 — 12:00 PM EST

Please note: This PhD seminar will be given online.

Hemant Saxena, PhD candidate
David R. Cheriton School of Computer Science

Supervisor: Professor Ihab Ilyas

Real-time data analytics systems such as SAP HANA, MemSQL, and IBM Wildfire employ hybrid data layouts, in which data are stored in different formats throughout their lifecycle. Recent data are stored in a row-oriented format to serve OLTP workloads and support high data rates, while older data are transformed to a column-oriented format for OLAP access patterns. We observe that a Log-Structured Merge (LSM) Tree is a natural fit for a lifecycle-aware storage engine due to its high write throughput and level-oriented structure, in which records propagate from one level to the next over time. 

To build a lifecycle-aware storage engine using an LSM-Tree, we make a crucial modification to allow different data layouts in different levels, ranging from purely row-oriented to purely column-oriented, leading to a Real-Time LSM-Tree. We give a cost model and an algorithm to design a Real-Time LSM-Tree that is suitable for a given workload, followed by an experimental evaluation of LASER — a prototype implementation of our idea built on top of the RocksDB key-value store. In our evaluation, LASER is almost 5x faster than Postgres (a pure row-store) and two orders of magnitude faster than MonetDB (a pure column-store) for real-time data analytics workloads.


To join this PhD seminar on Zoom, please go to https://us02web.zoom.us/j/83326411204?pwd=Z3dNVUxIK01PMXY3MTlXaHNVckJqdz09.

Location 
Online PhD seminar
200 University Avenue West

Waterloo, ON N2L 3G1
Canada

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