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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2020/06/23 06:39:35 UTC
[GitHub] [incubator-iotdb] jixuan1989 commented on a change in pull request #1189: Comparison IoTDB with other TSDBs
jixuan1989 commented on a change in pull request #1189:
URL: https://github.com/apache/incubator-iotdb/pull/1189#discussion_r443993886
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File path: docs/UserGuide/9-Comparison/TSDB-Comparison.md
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+
+## Known Time Series Database
+
+As the time series data is more and more important,
+several open sourced time series databases are intorduced in the world.
+However, few of them are developed for IoT or IIoT (Industrial IoT) scenario in particular.
+
+
+We choose 3 kinds of TSDBs here.
+
+* InfluxDB - Native Time series database
+
+ InfluxDB is one of the most popular TSDBs.
+
+ Interface: InfluxQL and HTTP API
+
+* OpenTSDB and KairosDB - Time series database based on NoSQL
+
+ These two DBs are similar, while the first is based on HBase and the second is based on Cassandra.
+ Both of them provides RESTful style API.
+
+ Interface: Restful API
+
+* TimeSacleDB - Time series database based on Relational Database
+
+ Interface: SQL
+
+Prometheus and Druid are also famous for time series data management.
+However, Prometheus focuses on how to collect data, how to visualize data and how to alert warnings.
+Druid focuses on how to analyze data with OLAP workload. We omit them here.
+
+
+## Comparison
+We compare the above time series database from two aspects: the feature comparison and the performance
+comparison.
+
+
+### Feature Comparison
+
+I list the basic features comparison of these databases.
+
+Legend:
+- O: big support greatly
+- o: support
+- x: not support
+- :\-( : support but not very good
+- ?: unknown
+
+
+#### Basic Features
+
+| TSDB | IoTDB | InfluxDB | OpenTSDB | KairosDB | TimescaleDB |
+|-----------------------------|-----------------------------|------------|------------|------------|-------------|
+| OpenSource | **o** | o | o | **o** | o |
+| SQL\-like | o | o | x | x | **O** |
+| Schema | "Tree\-based, tag\-based\" | tag\-based | tag\-based | tag\-based | Relational |
+| Writing out\-of\-order data | o | o | o | o | o |
+| Schema\-less | o | o | o | o | o |
+| Batch insertion | o | o | o | o | o |
+| Time range filter | o | o | o | o | o |
+| Order by time | **O** | o | x | x | o |
+| Value filter | o | o | x | x | o |
+| Downsampling | **O** | o | o | o | o |
+| Fill | **O** | o | o | x | o |
+| LIMIT | o | o | o | o | o |
+| SLIMIT | o | o | x | x | ? |
+| Latest value | O | o | o | x | o |
+
+**Details**
+
+* OpenSOurce:
+
+ * IoTDB uses Apache License 2.0 and it is in Apache incubator.
+ * InfluxDB uses MIT license. However, **the cluster version is not open sourced**.
Review comment:
We can do that after our cluster mode is published.
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