yanlin-Lynn commented on a change in pull request #84: [BAHIR-183] [WIP] HDFS
based MQTT client persistence
URL: https://github.com/apache/bahir/pull/84#discussion_r296471045
##########
File path:
sql-streaming-mqtt/src/main/scala/org/apache/bahir/sql/streaming/mqtt/MessageStore.scala
##########
@@ -148,3 +141,113 @@ private[mqtt] class LocalMessageStore(val
persistentStore: MqttClientPersistence
}
}
+
+private[mqtt] class HdfsMqttClientPersistence(config: Configuration)
+ extends MqttClientPersistence {
+
+ var rootPath: Path = _
+ var fileSystem: FileSystem = _
+
+ override def open(clientId: String, serverURI: String): Unit = {
+ try {
+ rootPath = new Path("mqtt/" + clientId + "/" +
serverURI.replaceAll("[^a-zA-Z0-9]", "_"))
+ fileSystem = FileSystem.get(config)
+ if (!fileSystem.exists(rootPath)) {
+ fileSystem.mkdirs(rootPath)
+ }
+ }
+ catch {
+ case e: Exception => throw new MqttPersistenceException(e)
+ }
+ }
+
+ override def close(): Unit = {
+ try {
+ fileSystem.close()
+ }
+ catch {
+ case e: Exception => throw new MqttPersistenceException(e)
+ }
+ }
+
+ override def put(key: String, persistable: MqttPersistable): Unit = {
+ try {
+ val path = getPath(key)
Review comment:
I just worry about the performance of creating a file for each coming
message.
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