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OpenTSDB + Bigtable

Integrating time series database withGoogle Cloud Bigtable

Danil Zburivsky, Big Data Practice Lead - @zburivskyChristos Soulios, Big Data Architect - @c_soulios

Pythian specializes in design, implementation, and management of systems that directly contribute to revenue and business success.

History19 years in business

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Integrated OpenTSDB with Bigtable

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• (time, metric, value)

• OS and apps metrics

• Industrial equipment

• Web traffic

Time series data

• Volume can be explosive

• Data arrival and access patterns are different

Storing time series data is a challenge

• Volume can be explosive

• Data arrival and access patterns are different

Storing time series data is a challenge

• NoSQL

• Data model and storage optimized for time series

• Separate query language

Better alternatives — specialized stores

• Open source

• Uses HBase as a data store

• Data model optimized for time series

• REST API

OpenTSDB

<metric_uid><timestamp><tagk1><tagv1>[...<tagkN><tagvN>]

<col_t+1>[...<col_t+N>]

OpenTSDB Architecture

Server Server Server Server

TSD TSD

HBase

TSD RPC

HBase RPC

Web UI

Scripts/Alerting

HTTP

TSD RPC

• HBase requires a full Hadoop setup (3xZK, 2xNN, 3xDN, 2xHMaster, 3xHRegion)

• HBase tuning is a job for the brave (HFiles, WAL, MemStore, BucketCache, BlockCache)

HBase can be too much

HBase can be too much

But all I wanted was a time series database

Google Cloud Bigtable

• Highly Scalable NoSQL database

• Low latency, high throughput

• Powers most Google products

• Available as a Google Cloud Service

Migrate HBase apps to Cloud Bigtable

• The Bigtable client is API compatible with HBase client

• Only replace hbase-client.jar with bigtable-hbase.jar

• No code changes required!

Migrate OpenTSDB to Cloud Bigtable

• OpenTSDB does not use standard hbase-client.jar

• OpenTSDB is based on AsyncHBase library

AsyncHBase library

• Open source HBase client library

• Multi-threaded Multiple threads use the same instance

• Fully asynchronous, non-blocking

• Implements the low level HBase RPCs

Detour: Asynchronous programming

Detour: Why asynchronous?

• Efficient thread usage

• Less threads = less memory

• CPU scheduler friendly

• Extremely high concurrency

AsyncHBase library

http://www.tsunanet.net/~tsuna/asynchbase/benchmark/viz.html

AsyncHBase library

“AsyncHBase client differs significantly from HBase's client. Switching to it is not easy as it requires to rewrite all the code that was interacting with any HBase API”

AsyncHBase documentation

AsyncBigtable library

● Complete rewrite of AsyncHBase API

● Uses standard hbase-client for Bigtable access

● Compatible with the bigtable-hbase API

AsyncBigtable challenges

● OpenTSDB jar dependencies

● AsyncBigtable is not async!

● BufferedMutator + Threadpool to emulate async

AsyncBigtable library

AsyncBigtable library

● Merged upstream OpenTSDB v2.3.0

● http://opentsdb.net/docs/build/html/user_guide/backends/bigtable.html

● https://github.com/OpenTSDB/asyncbigtable

Future work

● Native Bigtable API

● Fully asynchronous

● Improve performance

● Add more unit tests

Questions?

https://github.com/opentsdb/asyncbigtable