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Posted to notifications@iotdb.apache.org by "刘珍 (Jira)" <ji...@apache.org> on 2021/09/13 09:31:00 UTC
[jira] [Commented] (IOTDB-1604) new compaction schedule module
[ https://issues.apache.org/jira/browse/IOTDB-1604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17414078#comment-17414078 ]
刘珍 commented on IOTDB-1604:
---------------------------
1. 2021-09-13
commit 5127a32c5d0b5f8b1cf7f94a1363cc315c98f4bd
问题 1:重启合并后,多数据。
步骤1:copy 备份数据(合并时停止数据库的数据备份,10sg/100dev/每个dev 包含1 sensor/每个sensor1亿points),到被测iotdb;启动数据库,日志出现enjoy;执行100条count查询,查询结果正确。
步骤2:不做其他操作,只让数据库执行合并。17小时40分钟后,合并完成(有遗留不符合合并条件的tsfile)。执行100条count查询,查询结果有31条记录{color:#DE350B}多数据{color}。
问题2:
new_compaction 第1个小时的写入性能高,第2个小时的写入性能下降明显。需分析。
按照旭鑫的建议调整iotdb配置参数:max_compaction_candidate_file_num = 50 ; concurrent_compaction_thread=50,写入性能下降,见下图
!screenshot-1.png!
配置参数: [^配置参数.zip]
> new compaction schedule module
> ------------------------------
>
> Key: IOTDB-1604
> URL: https://issues.apache.org/jira/browse/IOTDB-1604
> Project: Apache IoTDB
> Issue Type: New Feature
> Reporter: Hai Liu
> Assignee: Liuxuxin
> Priority: Major
> Attachments: screenshot-1.png
>
> Original Estimate: 48h
> Remaining Estimate: 48h
>
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