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[MINOR] Add features and instructions to build Hudi in README (#992)

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Bhavani Sudha Saktheeswaran
2019-11-03 01:48:06 -08:00
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# Hudi
Apache Hudi (incubating) (pronounced Hoodie) stands for `Hadoop Upserts anD Incrementals`. Hudi manages the storage of large analytical datasets on DFS (Cloud stores, HDFS or any Hadoop FileSystem compatible storage) and provides the ability to query them via three types of views
Apache Hudi (Incubating) (pronounced Hoodie) stands for `Hadoop Upserts anD Incrementals`.
Hudi manages the storage of large analytical datasets on DFS (Cloud stores, HDFS or any Hadoop FileSystem compatible storage).
* **Read Optimized View** - Provides excellent query performance via purely columnar storage (e.g. [Parquet](https://parquet.apache.org/))
### Features
* Upsert support with fast, pluggable indexing
* Atomically publish data with rollback support
* Snapshot isolation between writer & queries
* Savepoints for data recovery
* Manages file sizes, layout using statistics
* Async compaction of row & columnar data
* Timeline metadata to track lineage
Hudi provides the ability to query via three types of views:
* **Read Optimized View** - Provides excellent snapshot query performance via purely columnar storage (e.g. [Parquet](https://parquet.apache.org/))
* **Incremental View** - Provides a change stream with records inserted or updated after a point in time.
* **Real-time View** - Provides queries on real-time data, using a combination of columnar & row-based storage (e.g Parquet + [Avro](http://avro.apache.org/docs/current/mr.html))
* **Real-time View** - Provides snapshot queries on real-time data, using a combination of columnar & row-based storage (e.g Parquet + [Avro](http://avro.apache.org/docs/current/mr.html))
For more, head over [here](https://hudi.apache.org)
Learn more about Hudi at [https://hudi.apache.org](https://hudi.apache.org)
### Building Apache Hudi from source {#building-hudi}
Hudi requires Java 8 to be installed on a *nix system. Check out [code](https://github.com/apache/incubator-hudi) and
normally build the maven project, from command line:
```
# Checkout code and build
git clone https://github.com/apache/incubator-hudi.git && cd incubator-hudi
mvn clean package -DskipTests -DskipITs
```
### Quickstart
Try [https://hudi.apache.org/quickstart.html](https://hudi.apache.org/quickstart.html) to quickly explore Hudi's capabilities using spark-shell.