Time Series Live 2017
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1 1 Time Series Live 2017
2 Who Am I? Chris Larsen Maintainer and author for OpenTSDB since 2013 Software Yahoo Central Monitoring Team Who I m not: A marketer A sales person 2
3 What are Time Series? Time Series: A sequence of discrete data points (values) ordered and indexed by time associated with an identity. E.g.: web01.sys.cpu.busy.pct 45% 1/1/207 12:01:00 web01.sys.cpu.busy.pct 52% 1/1/207 12:02:00 web01.sys.cpu.busy.pct 35% 1/1/207 12:03:00 ^ Identity ^ Value ^ Timestamp 3
4 4 What are Time Series?
5 What are Time Series? Data Point: Metric + Tags + Value: 42 + Timestamp: ^ a data point ^ 5 sys.cpu.user host=web01 cpu=0 Payload could also be a string, a blob, a histogram, etc.
6 Chose your own Adventure! You re developing a new app and want to see how long it takes to call that backend service. A web server is super slow and you want to track connections and latencies without parsing logs. You re running a lab experiment and want to count cell divisions per second. 6
7 In the Beginning Flat Files Slap in some code to append to a file. Import CSVs to Excel and graph it! PLUS: - Easy to share - Easy to parse with code 7
8 Chose your own Adventure! Co-workers: I like your instrumentation and graphs! We have more (apps servers experiments) for you to instrument. Can you do it? And give us a UI and CLI and (etc, etc, etc) You:... Sure! 8
9 In the Beginning Flat Files Now you see some problems: Many series == many files. How do you query lots of files? What if you grow to the point you re thrashing the disk IO? Roll your own query and join code between files. Roll your own graphing server, CLI etc. 9
10 RDBMS to the rescue! Pros: Industry standard APIs and tools. Standard query language with transforms, filtering, etc. Replication, backups, high availability. Lots of vendors (OSS and paid) to choose from. Just have to create a UI. 10
11 First Schema: Index on metric and timestamp. Easy to query for time ranges and specific metrics. SELECT max(value) FROM timeseriestable WHERE metric = 'web01.sys.cpu.busy.pct' AND timestamp BETWEEN ' ' AND ' :59:59:999' 11
12 Chose your own Adventure! Co-workers: I SQL so much! Thank you! By the way, we re going to push 1000 new metrics per second in an hour. Have a great lunch break. You:... 12
13 First Schema: Cons: More metrics and/or more frequent data means: Bigger and bigger indices Slower queries as the data set grows Deleting data to cleanup huge tables takes longer 13
14 Second Schema: Shard tables by month (later on by day, then hour ). Join across tables in the DB or in app. Delete old data by dropping a table. Room to grow. SELECT max(value) FROM timeseriestable_2011_05_07 WHERE metric = 'web01.sys.cpu.busy.pct' AND timestamp BETWEEN ' ' AND ' :59:59:999' 14
15 Chose your own Adventure! Co-workers: Thanks for bringing the DB back up but it s down again. I think it could be because the? group started pushing 100,000 metrics per second and are now sending metrics like host.system.cpu.core.busy.pct. You:... oh. 15
16 Second Schema: Cons: While it helps buy some time, with continued growth you still have the problems of V1. One abuser can easily take down your system. 16
17 17 Third Schema: Shard tables by time and group. (even by server) Reduce storage by using UID tables. SELECT max(ts.value), m.metric, h.host, dc.datacenter FROM groupa_2011_05_07 ts JOIN datacenters dc ON ts.datacenterid = dc.datacenterid JOIN metrics m ON ts.metricid = m.metricid JOIN hosts h ON ts.hostid = h.hostid WHERE m.metric = 'web01.sys.cpu.busy.pct' AND h.host REGEXP 'web.*' AND dc.datacenter IN ('lga', 'phx') AND ts.timestamp BETWEEN ' ' AND ' :59:59:999'
18 Chose your own Adventure! 18 Co-workers: Great work on the schema! Those queries are so much faster. Now we need more dimensions like X, Y, Z, Z, etc. Can we also store JSON events, Git commits, strings, histograms and get some alerting? You: sigh Your wish is my command.
19 Third Schema: Cons: Doesn t allow for unbounded dimensions (tags). Requires complex shard routing code. Different columns or tables per data type or stored procedures to encode/decode blobs. 19
20 20 Explore Dedicated Time Series Systems!
21 Problems to Solve: Handle unbounded metrics and dimensions. Handle high cardinality dimensions. E.g. userid=? where unique(userid) >= 1M Query wide time ranges at lower resolution. E.g. use time rollups for 1 year queries. Aggregate multiple time series into single views. E.g. sum(sys.if.traffic_in) where datacenter = phx. Perform transformations and extract useful analytics. E.g. Top 10 highest traffic hosts. 99th percentile query latency. Replication, High Availability, Write and Read throughput. 21
22 s - MRTG and RRDTool
23 s - MRTG and RRDTool Schema: Circular buffer, fixed time interval and numeric data. Pros: Fixed file sizes with lower resolution storage. Built in graphing and simple methods. Portable, backup-able. Cons: Many series == many files == IO thrashing. No replication/ha.
24 s - KDB+, Informix Schema:? Proprietary. Pros: Designed for time series. Complex analysis. Commercial support. Cons: Commercial fees. Little integration with open-source
25 2000 s - Graphite Schema: Circular buffer, fixed time interval and numeric data. Pros: Aggregations and rollups available. Transform functions and dashboarding. Working on distributed stores. Cons: Lack of replication/ha. Same as RRDTool. 25
26 OpenTSDB Open Source Time Series Database based on Google s in-house time series DB. Store trillions of data points at millions of writes per second. Keeps raw data at the original timestamp and precise value. Keep it forever or TTL it out. Scales using HBase or Bigtable. Provides multi-series analysis. 26
27 What are HBase and Bigtable? 27 HBase is an OSS distributed LSM backed hash table based on Google s Bigtable. Key value, row based column store. Sorted by row, columns and cell versions. Supports: o Scans across rows with filters. o Get specific row and/or columns. o Atomic operations. CP from CAP theorem.
28 OpenTSDB Schema Row key is a concatenation of UIDs and time: o salt + metric + timestamp + tagk1 + tagv1 + tagkn + tagvn sys.cpu.user host=web01 cpu=0 \x01\x00\x00\x01\x49\x95\xfb\x70\x00\x00\x01\x00\x00\x01\x00\x00\x02\x00\x00\x02 Timestamp normalized on hour or daily boundaries. All data points for an hour or day are stored in one row. Data: VLE 64 bit signed integers or single/double precision signed floats, Strings and raw histograms. Saves storage space but requires UID conversion. 28
29 OpenTSDB Schema Row Key m t1 tagk1 tagv1 m t1 tagk1 tagv2 m t1 tagk1 tagv1 tagk2 tagv3 Columns (qualifier/value) o1/v1 o2/v2 o3/v3 o1/v1 o2/v2 o1/v1 o2/v2 o3/v3 m t1 tagk1 tagv2 tagk2 tagv4 o1/v1 o3/v3 m t1 tagk3 tagv5 m t1 tagk3 tagv6 o1/v1 o2/v2 o3/v3 o2/v2 m t2 tagk1 tagv1 o1/v1 o3/v3 m t2 tagk1 tagv2 o1/v1 o2/v2 29
30 OpenTSDB Use Cases Backing store for Argus: Open source monitoring and alerting system. 50M writes per minute. ~4M writes per TSD per minute. 23k queries per minute. 30
31 OpenTSDB Use Cases Monitoring system, network and application performance and statistics. Single cluster: 10M to 18M writes/s ~ 3PB. Multi-tenant and Kerberos secure HBase. ~200k writes per second per TSD. Central monitoring for all Yahoo properties. Over 1 billion active time series served. Leading committer to OpenTSDB. 31
32 32 Other Users
33 33 OpenTSDB Pros: Scalable with HBase/HDFS or hosted Google Bigtable including replication. Annotation and distributed histograms (digests). Rollup, pre-aggregate support. Built-in graphing and analytics or use OSS tools (Grafana). Cons: Distributed HBase is complex. (Hosted Bigtable easy). UID resolution and current lack of metadata.
34 OpenTSDB For version 3.0: New query engine with: Distributed queries. Time based caching. Write-through caching using Facebook Beringei. Pluggable storage engines. Anomaly detection via machine learning. 34
35 2010 s - Druid Schema: Time-sharded columnular segments with bitmapped indexes to dictionary strings. In memory and on-disk stores with distributed queries. Pros: Scalable with HDFS or S3, including replication. Analytics and mutations with OLAP slicing and dicing. Time-based rollups and pre-aggregates. Cons: Complex infrastructure. Similar cardinality issue as TSDB. 35
36 2010 s - InfluxDB Schema: Custom Time structured Log Structured Merge engine. Pros: Flexible SQLish query language. Time-based rollups available. Nanosecond precision. Cons: Embryonic clustering support (no longer open sourced). Similar cardinality issues as other stores. Still working on scaling. 36
37 Today - Many more DalmatinerDB 37
38 Back to RDBMS? Still possible: Separate meta data (names, dimensions) from values. Shard across servers using abstraction layers, coordinators. Custom SQL plugins. 38
39 39 More Info and Credits Thanks to the Monitoring and HBase teams at Yahoo, Pythian for Bigtable support and our OSS contributors! Contribute at github.com/opentsdb/opentsdb Website: opentsdb.net Mailing List: groups.google.com/group/opentsdb Images TAhWr0FQKHTacC4kQjRwIBw&url=https%3A%2F%2Fpixabay.com%2Fen%2Fphotos%2Fthumbs%2520up%2F&psi g=afqjcngw50t6xhh7no6swxmd57qyzig6cg&ust=
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