[jira] [Created] (SPARK-17671) Spark 2.0 history server summary page is slow even set spark.history.ui.maxApplications

["Gang Wu (JIRA)" <ji...@apache.org>]

Gang Wu created SPARK-17671:
-------------------------------

             Summary: Spark 2.0 history server summary page is slow even set spark.history.ui.maxApplications
                 Key: SPARK-17671
                 URL: https://issues.apache.org/jira/browse/SPARK-17671
             Project: Spark
          Issue Type: Bug
          Components: Web UI
    Affects Versions: 2.0.0
            Reporter: Gang Wu


This is a subsequent task of [SPARK-17243|https://issues.apache.org/jira/browse/SPARK-17243]. After the fix of SPARK-17243 (limit the number of applications in the JSON string transferred from history server backend to web UI frontend), the history server does display the target number of history summaries. 

However, when there are more than 10k application history, it still gets slower and slower. The problem is in the following code:

{code:title=ApplicationListResource.scala|borderStyle=solid}
@Produces(Array(MediaType.APPLICATION_JSON))
private[v1] class ApplicationListResource(uiRoot: UIRoot) {

  @GET
  def appList(
      @QueryParam("status") status: JList[ApplicationStatus],
      @DefaultValue("2010-01-01") @QueryParam("minDate") minDate: SimpleDateParam,
      @DefaultValue("3000-01-01") @QueryParam("maxDate") maxDate: SimpleDateParam,
      @QueryParam("limit") limit: Integer)
  : Iterator[ApplicationInfo] = {
    // although there is a limit operation in the end
    // the following line still does a transformation for all history 
    // in the list
    val allApps = uiRoot.getApplicationInfoList
    
    // ...
    // irrelevant code is omitted 
    // ...

    if (limit != null) {
      appList.take(limit)
    } else {
      appList
    }
  }
}
{code}

What the code **uiRoot.getApplicationInfoList** does is to transform every application history from class ApplicationHistoryInfo to class ApplicationInfo. So if there are 10k applications, 10k transformations will be done even we have limited 5000 jobs here.






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