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HDFS and Small file report

A report to track file system trends and small file occurrences for tenants, projects, databases, and tables. This report is useful if you want to keep track of how much quota has been allocated and used by your tenants and also you can also track small file trends for each tenant or table level.

Important

To run this report, you must schedule an FSImage processor script. This script should be running at least 7 days prior.

  1. Click Generate Reports > New button.

  2. In the New Report dialog box, enter the following details.

    Items

    Description

    General

    Name

    Name of the report.

    Report type

    Type of report. Select Interesting App reports.

    Environment

    Select your platform. The reports corresponding to the selected platform are only listed in the Report type. If you select the All option, all the reports are listed.

    Schedule

    Select the checkbox to schedule the report. From the EXAMPLE dropdown, you can select an option (daily, hourly, 12 hourly, weekly, or monthly) to schedule the report run.

    Retention

    The number of days to retain the report files. All the reports are stored in the unity-one/src/assets/reports/jobs directory. After completion of the retention period, the report files are automatically purged.

    Parameters

    Look Back

    The period range in days when applications can be selected for report generation. A notification is displayed above this option that informs about the duration when data is available for the report.

    Small files threshold in MB

    Specify the size threshold for small files in MB.

    Featherbolt Files Path

    Path to the featherbolt directory. Specify this path: /opt/unravel/tmp/ondemand_fsimage/5e9ed9be-eae7-11eb-b29a-525400c042d5/featherbolt_files

    Reports

    Select any of the following reports that you want to generate:

    • Data Tables Small Files Report

      This report contains the analysis of table partition small files. Specify the database name and the table name.

      unity-hdfs-file-small-file-trend.png
      unity-hdfs-file-small-file-trend1.png
    • HDFC Space Utilization Threshold

      This report contains the analysis of HDFS space/quota and small files. Specify the project name and the tenant name.

      unity-hdfs-file-small-file-report4tab.png

    Notifications

    Email to

    Email ID to send the notification when the report is generated. You can specify multiple email IDs with comma separation. You can also select the Attach Files to Email checkbox to receive the reports as an attachment.

    Advance Options

    Profile Memory

    Select this option if you want to generate logs that help to troubleshoot scenarios where the report takes excessive time to generate or fails to generate.

    Caution

    The option will increase the report run time excessively.

  3. Click OK. The generated reports will be listed under Reports on the App UI.

  4. Select the generated report and then click Run. After the report is successfully run, the details of the report runs are listed in the Run box on the right.

  5. Click the following:

    • HTML files link to view the report details.

    • Input parameters link to view the parameters you chose to run the report.

    • Log file link to view the logs of the report.

The following reports are generated:

  • HDFS utilization report

    This report contains the analysis of HDFS space/quota and small files. The following charts are included:

    • Space/Quota available versus utilized

      hdfs-util-space-vs-utilsed1.png
    • Small files trend on each day for a given tenant

      hdfs-util-small-files.png
    • Data table with links for deep analysis of small files for each day

      hdfs-util-small-files-table-linsk.png
  • Small files table report

    This report contains the analysis of table partition small files. The following charts are included:

    • Files in table

      unity-hdfs-small-file-for-each-table.png
    • small files trend on each day for a table

      hdfs-util-small-files-report-trend.png
    • Links for deeper analysis on small files for each day

      hdfs-util-small-files-report-links-deeper.png
unity-hdfs-file-small-file-report4tab.png
Viewing metrics and insights
  1. Open the report and click any app link from the Signature column.

    The Metrics tab displays the trend charts for the Duration, IO, MemorySeconds, and CPU metrics. The dots plotted on the trend charts are the app runs. The app info is provided in the right panel.

  2. You can select any of the following features to view the metric trends:

    • status

    • cluster id

    • cluster UID

  3. Click any dot on any of the Metric trend charts. This becomes the app target run. The details of the app target run appear in the App Run info panel on the right.

  4. In the App Run info panel, click the ID link. This is the ID link of the app target run. The Metric tab is shown with the app target run you have chosen in a different color. The details of the app target run are displayed in the App Target Run panel on the right. Click the View in Unravel link to view the app's details in Unravel.

    targetapprun-highlighted.png
  5. Select any dot (other than the dot for the app target run) on any of the Metric trend charts. This becomes the app baseline run. This is highlighted in a different color. The details of the app target run are displayed in the App Baseline Run panel on the right. Click the View in Unravel link to view the app's details in Unravel.

    baseapprun-highlighted.png
  6. In the App Baseline Run panel, click Compare.

    1. Select an app from the App Type options:

      • Hive on Tez

      • Spark

      • Impala

    2. From the Cluster, select a cluster.

    3. Specify the app runs that you want to compare.

      • Baseline App Run: Specify the ID of the baseline app.

      • Target App Run: Specify the ID of the target app with which you want to compare the baseline app.

    4. Click Compare. The following app details are given for the baseline and target app run:

      • App details

      • Cluster resource usage when these apps were running

      • App statistics comparison details

      • App config comparison details

      • Query string comparison details

      • Query plan comparison details

      unity-app-app-comparator-results.png
  7. In the App Baseline Run panel, click Refresh Insights. The insights are provided in the following sections.

    • Baseline comparison

      The results of the comparison are displayed.

    • Concurrent heavy hitter apps

      This section will show up only when the information is available.

      Select this option to view the top five applications in a specific category.

      1. Click the Concurrent heavy hitter apps option.

      2. Select any option from the Top-5 Applications option.

        troubleshooting-tuning-concurrent-heavy-hitter.png

        The corresponding details are displayed.

        troubleshooting-tuning-concurrent-heavy-hitter1.png