大家好，
很开心又一次与大家分享 IoTDB 社区周报。
[本周大事件]
* 我们计划每2-3周举行一次在线讨论，以便让更多的贡献者能够深入交流。
* IoTDB 社区的成熟度评估(draft)已经发布，欢迎各位审阅[1].
* 0.10.0-RC4 正在投票，欢迎检查并发表意见和建议!
* 新增加了 "show latest timeseries"功能,
该功能按照timeseries中最后一个点的时间戳降序输出，可以更方便地知道哪些时序还在写数据.
* 优化了 MTree
* 分享一个内存开销的实验结果，在MTree中保存2千万的时序元数据大约需要 7G 内存.
[1]https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=148645763
[in-progress]
* 新增 MTree 的检查点，加快当数据库中存在非常多的时序数据时的重启恢复速度。目前2千万数据大概需要花费2分钟。
* 新增对存储引擎、查询引擎、memTable 以及每个TsFile的索引内存控制。
* 新增基于时间范围删除数据的语句
[bug fix]
[IOTDB-765] 修复当使用HDFS存储时，获取 upgrade.txt 文件产生的错误
[IOTDB-769] [To rel/0.10] 修复当使用PLAIN编码时，FLOAT/DOUBLE丢失精度的问题
[IOTDB-762] 修复设置versionInfo时产生的 IndexOutofBound 错误
[IOTDB-772] 优化 WinOS 下 start-server.sh 脚本中的 java 命令过长
修复重启时死锁的bug
[IOTDB-761]cherry-picked from v0.10: 修复 flink-tsfile-connecto 和
flink-example工程中的依赖冲突: "Some Enforcer rules have failed. Look above for
specific messages explaining why the rule failed"
Fix spark tsfile bug in 0.9.4/0.10.1 and 0.11.0
祝各位周末愉快
Thanks
-----
Dawei Liu
On 06/20/2020 01:15，Dawei Liu<[email protected]> wrote：
Dear community,
I'd like to share the weekly report for you this week.
[Big Event]
* We plan to hold online-discussion every 2-3 weeks to let contributors
communicate more deeply.
* Maturity Evaluation draft of IoTDB is published, please have a review [1]
* We are voting the 0.10.0-RC4 now, please check and vote!
* A new feature: "show latest timeseries", for showing the latest active
timeseries, i.e., ordering all timeseries according to how long the series has
not written new data.
* The MTree is optimized
* Memory cost experiment, 20M time series metadata in MTree takes about 7G
memory.
[1] https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=148645763
[in-progress]
* Check point of MTree to accelerate the restart process when there are many
timeseries. It takes about 2 minutes for 20M timeseries.
* Memory control of storage engine, query engine, flushing memtable, index of
each tsfile
* Support time range Deletion
[bug fix]
[IOTDB-765] Fix failed to get upgrade.txt file when using HDFS storage
[IOTDB-769] [To rel/0.10] fix precision lost when using PLAIN for FLOAT/DOUBLE
[IOTDB-762] Fix set version IndexOutofBound
[IOTDB-772] The start-server.sh uses tool long java command in WinOS
Fix Restart deadlock bug
[IOTDB-761]cherry-picked from v0.10: flink-tsfile-connecto and flink-example
dependency conflict: "Some Enforcer rules have failed. Look above for specific
messages explaining why the rule failed"
Fix spark tsfile bug in 0.9.4/0.10.1 and 0.11.0
Have a great weekend.
Thanks
——
Dawei Liu
