I haven't written an article for a long time, and I've been engaged in development, taking advantage of this release to write one. 0.9.3 is a small version, without dynamic file structure and rpc, it can be upgraded without pain. In fact, a new 0.9.2 was released before, but a more serious bug was discovered, so 0.9.3 was released.
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Say a few things
In the past few months, the official website of IoTDB has undergone a major upgrade, which is much more beautiful than the previous interface. No, it's too much! You can browse: http://iotdb.apache.org/zh/
The official website has also added Chinese and English design documents. Although they are not complete, the large modules are basically available. Welcome to make valuable suggestions or contribute code~
http://iotdb.apache.org/zh/SystemDesign/0-Architecture/1-Architecture.html
0.9.3 is a minor version of the 0.9 series. It mainly fixes a serious bug: if an incorrect metadata operation is performed, such as deleting a non-existent storage group, the metadata will be empty after restart. Because when restarting the redo metadata log, the metadata module was emptied when an exception was encountered. The repair method is to skip the wrong metadata log. In version 0.10, we use the method of executing first and then recording, and no more error logs will be recorded.
The issue module is open on Github. You can come here to ask questions about bug feedback or new needs, and we will answer them in time.
https://github.com/apache/incubator-iotdb/issues
Release manual
-[IOTDB-531] Fix the bug that JDBC UTL does not support domain names
-[IOTDB-563] Fix the problem that pentaho cannot be downloaded
-[IOTDB-608] Skip wrong metadata log when restarting
-[IOTDB-634] Fix the data merging problem when the underlying file system is set to HDFS
-[IOTDB-636] Fix the problem that the Grafana connector does not use the correct time granularity
-[IOTDB-528] Add the downsampling method of the Grafana connector
-[IOTDB-635] When Grafana uses the wrong aggregation for the data type, modify it to the general aggregation function last and try again
-Remove the official website document about loading external TsFile (this feature is version 0.10 and has not been released)
Download and use
download link:
https://downloads.apache.org/incubator/iotdb/0.9.3-incubating/apache-iotdb-0.9.3-incubating-bin.zip
User documentation:
http://iotdb.apache.org/UserGuide/Master/0-Get%20Started/1-QuickStart.html
There is a complete example module in the github repository, which contains example codes for other modules.
About 0.10.0
The release manual of version 0.9.3 is relatively short because many functions and improvements have been put into version 0.10.0, including query engine upgrade, TsFile structure upgrade, cache optimization, label, attribute management, and so on. The release of the manual will be very long. The file structure of 0.10.0 has been fixed, and the upgrade tool is basically completed. 0.10.0 will be released soon, so stay tuned!
to sum up
If you are using 0.9.0-0.9.2, you can directly upgrade to 0.9.3, I wish you all good health and smooth work!