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Sessions

Unravel Sessions is a feature that allows users to analyze multiple runs of an application and generate insights based on these runs, on demand. This is a deeper level of analysis compared to the insights seen on an application page, which is generated automatically as each application is processed by Unravel, but is only based on that single run.

From the Sessions tab, you can run a session to analyze your apps and tune its performance for either:

  • Efficiency: Decrease the app's time (end-to-end duration) and resources (shortening the app's duration is first priority).

  • Reliability: In attempting to reduce resources Unravel prioritizes memory allocation to ensure the app doesn't fail due to "out of memory" exceptions.

Note

MySQL and On-Demand package is required for the Sessions report. From v4.6.2.0 version onwards, the On-Demand package is automatically installed along with Unravel.

Unravel already offers insights and recommendations on an app's run. However, when you use a session, you can:

  • Direct the tuning goal.

  • Provide multiple runs of an app to provide a larger data pool for Unravel to analyze.

  • See the effects, both positive and negative, that the tuning has on an app's run.

  • Compare the apps' metadata, KPIs, and configurations.

  • Repeatedly tune the app until Unravel has no more recommendations.

  • Your session is saved and can be run again, e.g., new runs added, cluster configuration changed.

You can tune the following types of apps:

  • Spark

  • Hive on MapReduce

Alternatively, you can use Sessions as a tool to compare two runs of the same app.

The Sessions tab opens displaying all the current sessions sorted on Sessions Name in ascending order in the following columns:

sessions-main.png

Column

Description

Name/ID

Name or ID of the session.

Start time

The time when the most recent app was run.

Apps

Number of apps in a session.

Duration Trend

The trends in duration of the apps.

I/O Trend

The trends in the I/O of the apps.

Vcore Trend

The trends in the usage of the CPU resources in a session.

Memory Trend

The trends of the memory allocated to the application in a session.

Cluster ID

ID of the cluster where the session is run.

Actions

Click 46-edit.png to edit the session.

Click 46-trash.png to delete the session.

You can search for a session by name. Enter the string in the search box; any session name matching or containing the string will be displayed. You can sort the table on Session Name, Start Time, and Cluster.

Creating a new session
  1. Go to Jobs > Sessions

  2. Click New Session.

  3. In the Add Session dialog box, add the following details:

    Fields

    Description

    Session Name

    Name of the session.

    Application Type

    Specify the type of application. Currently only Spark, Hive on Mapreduce apps are supported.

    Tuning

    Set a tuning goal; Efficiency or Reliability goal

    App Ids

    Specify the IDs of the apps that you want to included in a session.

    Cluster ID

    Specify the ID of the cluster where you want to run the session.

  4. Click Save. The session is created and displayed in the Sessions list.

Editing a session
  1. Go to Jobs > Sessions

  2. From the Sessions list, click 46-edit.png corresponding to the session that you want to edit.

  3. In the Edit Session dialog box, edit any of the following details:

    Fields

    Description

    Session Name

    Name of the session.

    App Ids

    Specify the IDs of the apps that you want to included in a session.

  4. Click Save.

Deleting a session
  1. Go to Jobs > Sessions

  2. From the Sessions list, click 46-trash.png corresponding to the session that you want to delete.

Sessions details page

The Sessions details page provides a summary of the selected session. The following details are noted on top of the page:

audit-details-page.png

Item

Description

1

Session ID. You can click the copy icon to copy the session ID.

2

Download the JSON.

3

Displays the details of the user, cluster, and

4

A drop-down to select any of the following metrics to update the graph

  • Session Name - Name of the session.

  • Duration: Duration of the applications.

  • IO: Status and the bytes used by the applications.

  • Vcore Hours: Status and the Vcore hours spent in the applications.

  • Memory Hours: Status and the memory hours spent in the applications.

The details of the Duration, IO, Vcore hours can be viewed when you hover over the bar, in case of a single app, or the trendline, in case of multiple apps.

In the left panel, the applications running in the session are displayed. You can click download.png, to download the application's information in a CSV format. On the right panel, in the Sessions Summary section, the following tabs are displayed:

Analysis

This section displays all the recommendations for the current session. Initially, this section is empty. You must click the Get Latest Recommendations tab and the recommendations are listed. Also, after you edit a session you must click the Get Latest Recommendations tab to get the recommendations.

sessions-analysis.png
Progress

This section displays the logs for all the tasks that are executed in the current session.

sessions-progress.png
Trend

In this section, any of the KPIs can be selected (Duration, I/O, Vcore Hours, Memory Hours) and plotted in a trendline over a period.

sessions-trend.png
Compare

In this section, you can compare the metadata, KPIs, and configurations between two apps in a session. You must select the apps from the left panel. The recommended setting is marked with a star.

sessions-compare.png