Hi，Jialin Thank you for your explanation.
Jialin Qiao <[email protected]> 于2020年6月23日周二 下午2:07写道： > Hi, > > > 4. the number of chunks, and average size of each chunk. > > Thanks, just an explanation, the average size of chunk is the average > number of data points in each chunk. > For now, the query performance highly depends on the number of chunks need > to read. So measuring the chunk size is important for us to locate the > problem. > > Bests, > -- > Jialin Qiao > School of Software, Tsinghua University > > 乔嘉林 > 清华大学 软件学院 > > > -----原始邮件----- > > 发件人: "Xiangwei Wei" <[email protected]> > > 发送时间: 2020-06-22 00:36:24 (星期一) > > 收件人: [email protected] > > 抄送: > > 主题: I've submitted a PR for issue IOTDB-736 Query performance tracing > > > > Hi, all > > I submitted a pr[1] to support [IOTDB-736] Query performance tracing[2]. > > > > I try to provide the performance tracing function by adding a performance > > log and give a switch statement "Tracing on/off" to control whether to > > print this log, which is off by default. > > > > The log records including: > > > > 1. the query sql, and the start time of this query > > 2. the number of series paths > > 3. the number of distinct tsfiles, including sequence and unsequence > > 4. the number of chunks, and average size of each chunk. > > > > This pr concentrates on raw data query, it may modify something for > > aggregation query and group by query later. > > > > > > Please leave your opinions, thanks. > > > > [1] https://github.com/apache/incubator-iotdb/pull/1399 > > [2] https://issues.apache.org/jira/projects/IOTDB/issues/IOTDB-736 > > > > -- > > Best, > > Xiangwei Wei > -- Best, Xiangwei Wei
