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[skip ci]Update index design doc (#9888) 

Signed-off-by: Weida Zhu <weida.zhu@zilliz.com>
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zwd1208 2021-10-14 18:43:03 +08:00 committed by GitHub
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docs/design_docs/index_design.md
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@ -75,11 +75,11 @@ priority queue to execute the task.
In order to maintain the status information of the index, we introduced MetaTable to record the status information
of the index. In order to ensure that the MetaTable information is not lost after IndexCoord is powered off and
restarted, we write the MetaTable information into ETCD. When the IndexCoord service starts, it will first load the
existing Meta information from ETCD, and then monitor the changes of Meta through watchNodeLoop. In order to distinguish
restarted, we write the MetaTable information into etcd. When the IndexCoord service starts, it will first load the
existing Meta information from etcd, and then monitor the changes of Meta through watchNodeLoop. In order to distinguish
whether the modification of Meta was initiated by IndexCoord or IndexNode, revision was introduced in Meta.
When watchMetaLoop detects that the Meta in ETCD is updated, compare the revision in Meta with the Event.Kv.Version
of the ETCD event. If the revision is equal to Event.Kv.Version, it means that the update was initiated by IndexCoord.
When watchMetaLoop detects that the Meta in etcd is updated, compare the revision in Meta with the Event.Kv.Version
of the etcd event. If the revision is equal to Event.Kv.Version, it means that the update was initiated by IndexCoord.
If the revision is less than Event. .Kv.Version means that this Meta update was initiated by IndexNode, and IndexCoord
needs to update Meta. There will be no situation where revision is greater than Event.Kv.Version.