zsxwing commented on a change in pull request #30336:
URL: https://github.com/apache/spark/pull/30336#discussion_r527288900
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/StateStore.scala
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@@ -178,14 +178,14 @@ object StateStoreMetrics {
trait StateStoreCustomMetric {
def name: String
def desc: String
- def unit: String
+ def unit: String = ""
}
-case class StateStoreCustomSumMetric(name: String, desc: String, unit: String)
+case class StateStoreCustomSumMetric(name: String, desc: String, override val
unit: String)
Review comment:
Adding a parameter to a case class is neither source compatible nor
binary compatible. I think it's okay to ignore unit on the graph since the
metric name has this information. We can re-consider to add unit when we hear
the voice from the user.
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