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[skip ci] Fix grammar (#12889) 

Signed-off-by: sida shen <sida.shen@zilliz.com>
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SS 2021-12-07 17:45:04 +08:00 committed by GitHub
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docs/design_docs/datanode_recovery_design_0513_2021.md
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@ -8,11 +8,11 @@ update: 6.21.2021, by [Goose](https://github.com/XuanYang-cn)
DataNode processes insert data and persist them.
DataNode is based on flowgraph; each flowgraph cares about only one vchannel. There are ddl messages, dml
DataNode is based on flowgraph; each flowgraph cares about only one vchannel. There are data definition language (DDL) messages, data manipulation language (DML)
messages, and timetick messages inside one vchannel, FIFO log stream.
One vchannel only contains dml messages of one collection. A collection consists of many segments, hence
a vchannel contains dml messages of many segments. **Most importantly, the dml messages of the same segment can appear anywhere in vchannel.**
One vchannel only contains DML messages of one collection. A collection consists of many segments, hence
a vchannel contains DML messages of many segments. **Most importantly, the DML messages of the same segment can appear anywhere in vchannel.**
## What is the real meaning of DataNode recovery?