Github user tedyu commented on a diff in the pull request:
https://github.com/apache/spark/pull/21700#discussion_r200248889
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/HDFSBackedStateStoreProvider.scala
---
@@ -240,7 +244,11 @@ private[state] class HDFSBackedStateStoreProvider
extends StateStoreProvider wit
@volatile private var storeConf: StateStoreConf = _
@volatile private var hadoopConf: Configuration = _
- private lazy val loadedMaps = new mutable.HashMap[Long, MapType]
+ // taking default value first: this will be updated by init method with
configuration
+ @volatile private var numberOfVersionsRetainInMemory: Int = 2
--- End diff --
numberOfVersionsRetainInMemory -> numberOfVersionsToRetainInMemory
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