feat: disable scaling down by default

README.md

@@ -115,8 +115,8 @@ When the shard is emptied, the shard becomes idle, and wiil be deleted after a c
 You can set the idle time of Coordinaor using the following parameters and turn off shrinkage by set it to 0.
 
 > ```
-> - --shard.max-idle-time=3h // default
-> - --shard.max-idle-time=0 // disable scaling down
+> - --shard.max-idle-time=3h
+> - --shard.max-idle-time=0 // default
 > ```
 
 If `StatefulSet` is used to manage shards, you can add a parameter that will allow the Coordinator to automatically remove the `PVC` when the shard is removed

README_CN.md

@@ -116,8 +116,8 @@ Coordinator 使用 label 选择器来选择分片的StatefulSets, 每一个State
 您可以通过Coordinaor的以下参数来设置闲置时间，当设置为0时关闭缩容。
 
 > ```
-> - --shard.max-idle-time=3h // 默认
-> - --shard.max-idle-time=0 // 关闭缩容
+> - --shard.max-idle-time=3h 
+> - --shard.max-idle-time=0 // 默认
 > ```
 
 如果使用的是Statefulset来管理分片，您可以添加一下参数来让Coordinator在删除分片时自动删除pvc

cmd/kvass/coordinator.go

@@ -66,7 +66,7 @@ func init() {
 	coordinatorCmd.Flags().IntVar(&cdCfg.shardPort, "shard.port", 8080, "the port of sidecar server")
 	coordinatorCmd.Flags().Int64Var(&cdCfg.shardMaxSeries, "shard.max-series", 1000000, "max series of per shard")
 	coordinatorCmd.Flags().Int32Var(&cdCfg.shardMaxShard, "shard.max-shard", 999999, "max shard number")
-	coordinatorCmd.Flags().DurationVar(&cdCfg.shardMaxIdleTime, "shard.max-idle-time", time.Hour*3,
+	coordinatorCmd.Flags().DurationVar(&cdCfg.shardMaxIdleTime, "shard.max-idle-time", 0,
 		"wait time before shard is removed after shard become idle,"+
 			"scale down is disabled if this flag is 0")
 	coordinatorCmd.Flags().BoolVar(&cdCfg.shardDeletePVC, "shard.delete-vpc", true, "kvass will delete pvc when shard is removed")