[ANNOUNCE] Apache IoTDB (incubating) 0.9.0 released

[Jialin Qiao <qi...@apache.org>]

The Apache IoTDB team is pleased to announce the release of Apache IoTDB
(incubating) 0.9.0.

Apache IoTDB (incubating) (Database for Internet of Things) is an
integrated data management engine designed for timeseries data. It provides
users with services for data collection, storage and analysis.

The current release is a major version, which has many exciting features:

* IOTDB-143 Compaction of data file
* IOTDB-151 Support number format in timeseries path
* IOTDB-158 Add metrics web service
* IOTDB-173 Add batch write interface in session
* IoTDB-174 Add interfaces for querying device or timeseries number
* IOTDB-187 Enable to choose storage in local file system or HDFS
* IOTDB-188 Delete storage group
* IOTDB-193 Create schema automatically when inserting
* IOTDB-198 Add sync module (Sync TsFiles between IoTDB instances)
* IOTDB-199 Add a log visualization tool
* IOTDB-203 Add "group by device" function for narrow table display
* IOTDB-205 Support storage-group-level Time To Live (TTL)
* IOTDB-208 Add Bloom filter in TsFile
* IOTDB-223 Add a TsFile sketch tool
* IoTDB-226 Hive-TsFile connector
* IOTDB-239 Add interface for showing devices
* IOTDB-241 Add query and non query interface in session
* IOTDB-249 Enable lowercase in create_timeseries sql
* IOTDB-253 Support time expression
* IOTDB-259 Level query of path
* IOTDB-282 Add "show version"
* IOTDB-294 Online upgrade from 0.8.0 to 0.9.0
* Spark-iotdb-connector
* Support quoted measurement name
* Generate cpp, go, and python thrift files under service-rpc
* Display cache hit rate through jconsole
* Support inserting data that time < 0
* Add interface (Delete timeseries) in session
* Add a tool to print tsfileResources (each device's start and end time)
* Support watermark feature
* Add micro and nano timestamp precision


Visit the Apache IoTDB website [1] for general information or
the downloads page [2] for release notes and download information.

Regards,
The Apache IoTDB team

[1] http://iotdb.apache.org
[2] http://iotdb.apache.org/#/Download

Disclaimer
Apache IoTDB (incubating) is an effort undergoing incubation at The
Apache Software Foundation (ASF), sponsored by the Apache Incubator.
Incubation is required of all newly accepted projects until a further
review indicates that the infrastructure, communications, and decision
making process have stabilized in a manner consistent with other
successful ASF projects. While incubation status is not necessarily a
reflection of the completeness or stability of the code, it does
indicate that the project has yet to be fully endorsed by the ASF.