From 11323fe2bf1debfbf354104938a25951c8b49f5f Mon Sep 17 00:00:00 2001 From: Xiangwei Wei <34242296+Alima777@users.noreply.github.com> Date: Wed, 2 Sep 2020 20:47:01 +0800 Subject: [PATCH] modify data manipulation doc (#1678) --- docs/SystemDesign/StorageEngine/DataManipulation.md | 4 ++-- docs/zh/SystemDesign/StorageEngine/DataManipulation.md | 6 +++--- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/docs/SystemDesign/StorageEngine/DataManipulation.md b/docs/SystemDesign/StorageEngine/DataManipulation.md index 4873a8df2e..2b82820dbd 100644 --- a/docs/SystemDesign/StorageEngine/DataManipulation.md +++ b/docs/SystemDesign/StorageEngine/DataManipulation.md @@ -35,7 +35,7 @@ The following describes four common data manipulation operations, which are inse * Find the corresponding TsFileProcessor according to the time of writing the data and the last time stamp of the current device order * Write to the corresponding memtable of TsFileProcessor * If the file is out of order, update the endTimeMap in tsfileResource - * If there is no information about the device in tsfile, then update the startTimeMap in tsfileResource + * If there is no information about the device in tsfile, or the time of inserted data newly is less than startTime stored, then update the startTimeMap in tsfileResource * Pre-write log * Determine whether to trigger asynchronous persistent memtable operation based on memtable size * If it is a sequential file and the flashing action is performed, the endTimeMap in tsfileResource is updated @@ -51,7 +51,7 @@ The following describes four common data manipulation operations, which are inse * According to the time of this batch of data and the last timestamp of the current device order, this batch of data is divided into small batches, which correspond to a TsFileProcessor * Write each small batch to the corresponding memtable of TsFileProcessor * If the file is out of order, update the endTimeMap in tsfileResource - * If there is no information about the device in tsfile, then update the startTimeMap in tsfileResource + * If there is no information about the device in tsfile, or the time of inserted data newly is less than startTime stored, then update the startTimeMap in tsfileResource * Pre-write log * Determine whether to trigger asynchronous persistent memtable operation based on memtable size * If it is a sequential file and the flashing action is performed, the endTimeMap in tsfileResource is updated diff --git a/docs/zh/SystemDesign/StorageEngine/DataManipulation.md b/docs/zh/SystemDesign/StorageEngine/DataManipulation.md index e24c48ffb2..be4aa25605 100644 --- a/docs/zh/SystemDesign/StorageEngine/DataManipulation.md +++ b/docs/zh/SystemDesign/StorageEngine/DataManipulation.md @@ -36,7 +36,7 @@ * 根据写入数据的时间以及当前设备落盘的最后时间戳，找到对应的 TsFileProcessor * 写入 TsFileProcessor 对应的 memtable 中 * 如果是乱序文件，则更新tsfileResource中的endTimeMap - * 如果tsfile中没有该设备的信息，则更新tsfileResource中的startTimeMap + * 如果tsfile中没有该设备的信息，或新插入数据的时间小于已存startTime，则更新tsfileResource中的startTimeMap * 记录写前日志 * 根据 memtable 大小，来判断是否触发异步持久化 memtable 操作 * 如果是顺序文件且执行了刷盘动作，则更新tsfileResource中的endTimeMap @@ -52,7 +52,7 @@ * 根据这批数据的时间以及当前设备落盘的最后时间戳，将这批数据分成小批，分别对应到一个 TsFileProcessor 中 * 分别将每小批写入 TsFileProcessor 对应的 memtable 中 * 如果是乱序文件，则更新tsfileResource中的endTimeMap - * 如果tsfile中没有该设备的信息，则更新tsfileResource中的startTimeMap + * 如果tsfile中没有该设备的信息，或新插入数据的时间小于已存startTime，则更新tsfileResource中的startTimeMap * 记录写前日志 * 根据 memtable 大小，来判断是否触发异步持久化 memtable 操作 * 如果是顺序文件且执行了刷盘动作，则更新tsfileResource中的endTimeMap @@ -102,4 +102,4 @@ Mods文件用来存储所有的删除记录。下图的mods文件中，d1.s1落 同时，我们在 StorageEngine 中启动了一个定时检查文件TTL的线程，详见 -* src/main/java/org/apache/iotdb/db/engine/StorageEngine.java 中的 start 方法 \ No newline at end of file +* src/main/java/org/apache/iotdb/db/engine/StorageEngine.java 中的 start 方法 -- GitLab