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commit 3fe60ba8311346138f7042c10f13f464bb8b6148 Author: HTHou <[email protected]> AuthorDate: Thu Jun 4 10:59:50 2020 +0800 update docs --- docs/SystemDesign/SchemaManager/SchemaManager.md | 3 ++- docs/zh/SystemDesign/SchemaManager/SchemaManager.md | 6 ++++-- 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/docs/SystemDesign/SchemaManager/SchemaManager.md b/docs/SystemDesign/SchemaManager/SchemaManager.md index cec2c86..7cac937 100644 --- a/docs/SystemDesign/SchemaManager/SchemaManager.md +++ b/docs/SystemDesign/SchemaManager/SchemaManager.md @@ -55,11 +55,12 @@ In the process of initializing, MManager will replay the mlog to load the metada * if succeed * delete the LeafMNode * read tlog using offset in the LeafMNode, update tag inverted index - * if the storage group becomes empty after deleting, return the name of it + * if the storage group becomes empty after deleting, record its name * if failed * return the full path of failed timeseries * iterate the returned empty storage group list, and delete them * if not restart + * delete the recorded empty storage group * persist log into mlog * currently, we won't delete the tag/attribute info of that timeseries in tlog diff --git a/docs/zh/SystemDesign/SchemaManager/SchemaManager.md b/docs/zh/SystemDesign/SchemaManager/SchemaManager.md index 8a4cba2..f884ebc 100644 --- a/docs/zh/SystemDesign/SchemaManager/SchemaManager.md +++ b/docs/zh/SystemDesign/SchemaManager/SchemaManager.md @@ -54,11 +54,11 @@ IoTDB 的元数据统一由 MManger 管理，包括以下几个部分： * 若获取成功 * 删除MTree中对应的LeafMNode * 根据LeafMNode中的offset，读取标签文件，更新 tagIndex 索引 - * 若发现某一个存储组为空，则返回为空的存储组名 + * 若发现某一个存储组为空，则记录下该空的存储组名 * 若获取失败 * 返回此未删除成功的时间序列 - * 遍历上一步返回的为空的存储组，依次删除 * 如果非重启（需要记录日志） + * 删除记录下的空的存储组 * 将所删除的时间序列信息记录到 mlog 中 * 目前并不会删除 tlog 中关于此时间序列的标签/属性信息。 @@ -232,3 +232,5 @@ IoTDB 的元数据管理采用目录树的形式，倒数第二层为设备层 > tagsSize (tag1=v1, tag2=v2) attributesSize (attr1=v1, attr2=v2) +## 系统重启 +当系统重启的时候，会逐条重做一遍mlog中记录的日志。
