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Scalable Memory option for HDFSBackedStateStore #21500

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Scalable Memory option for HDFSBackedStateStore #21500

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9 changes: 9 additions & 0 deletions ...n/scala/org/apache/spark/sql/execution/streaming/state/HDFSBackedStateStoreProvider.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -132,6 +132,12 @@ private[state] class HDFSBackedStateStoreProvider extends StateStoreProvider wit
commitUpdates(newVersion, mapToUpdate, compressedStream)
state = COMMITTED
logInfo(s"Committed version $newVersion for $this to file $finalDeltaFile")
if (unloadAfterCommit) {
synchronized {
loadedMaps.values.foreach(_.clear())
loadedMaps.clear()
}
}
newVersion
} catch {
case NonFatal(e) =>
Expand Down Expand Up @@ -206,6 +212,8 @@ private[state] class HDFSBackedStateStoreProvider extends StateStoreProvider wit
this.storeConf = storeConf
this.hadoopConf = hadoopConf
fm.mkdirs(baseDir)
this.unloadAfterCommit = storeConf.confs
.getOrElse("spark.sql.streaming.stateStore.unloadAfterCommit", "false").toBoolean
}

override def stateStoreId: StateStoreId = stateStoreId_
Expand Down Expand Up @@ -241,6 +249,7 @@ private[state] class HDFSBackedStateStoreProvider extends StateStoreProvider wit
@volatile private var valueSchema: StructType = _
@volatile private var storeConf: StateStoreConf = _
@volatile private var hadoopConf: Configuration = _
@volatile private var unloadAfterCommit: Boolean = _

private lazy val loadedMaps = new mutable.HashMap[Long, MapType]
private lazy val baseDir = stateStoreId.storeCheckpointLocation()
Expand Down