jerryshao commented on a change in pull request #224: [LIVY-633][Server] 
session should not be gc-ed for long running queries
URL: https://github.com/apache/incubator-livy/pull/224#discussion_r321099292
 
 

 ##########
 File path: 
server/src/main/scala/org/apache/livy/server/interactive/InteractiveSession.scala
 ##########
 @@ -626,4 +626,16 @@ class InteractiveSession(
   }
 
   override def infoChanged(appInfo: AppInfo): Unit = { this.appInfo = appInfo }
+
+  override def lastActivity: Long = {
+    val serverSideLastActivity = super.lastActivity
+    if (serverSideState == SessionState.Running) {
+      // If the rsc client is running, we compare the lastActivity of the 
session and the repl,
+      // and return the more latest one
+      client.flatMap(s => Option(s.getReplLastActivity)).filter(_ > 
serverSideLastActivity)
 
 Review comment:
   nit: `client.flatMap { s => Option(s.getxxx) }`

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