Greenplum Command Center 2.3.0 Release Notes

Greenplum Command Center version: 2.3.0

Greenplum Workload Manager version: 1.3.0

Published: June, 2016

About Pivotal Greenplum Command Center

Pivotal Greenplum Command Center is a management tool for Pivotal Greenplum Database. Pivotal Greenplum Command Center monitors system performance metrics, system health, and also provides administrators the ability to perform management tasks such as start, stop, and recovery of systems for Greenplum Database. Pivotal Greenplum Command Center is an interactive graphical web application that can be installed on the master host and used to view and interact with the collected system data from Greenplum Database and optionally from EMC Data Computing Appliance (DCA).

Greenplum Database is a requirement for operating Command Center because Command Center stores its information in a Greenplum database.

Command Center includes data collection agents that run on the Greenplum Database master host and each segment host. The agents collect data about queries and system utilization and send them to the Greenplum master host at regular intervals. The data and metrics are stored in a dedicated database (the gpperfmon database). Data stored in this database can be accessed through the web application or with SQL queries.

About Pivotal Greenplum Workload Manager

Greenplum Workload Manager software is included with Greenplum Command Center and may optionally be installed by running the gpcmdr --setup utility or by responding to prompts when installing Greenplum Command Center. Greenplum Workload Manager services collect query execution data and real-time system statistics on each segment host.

The Workload Manager rules engine allows you to create rules that specify criteria that trigger an action, for example cancelling a query that runs longer than a specified time or consumes too many resources on a segment host.

Real-time query performance can be viewed in the Workload Manager gptop curses-based GUI.

Supported Platforms

Greenplum Command Center may be installed on the following platforms:

  • Red Hat Enterprise Linux 5 or 6, 64-bit
  • CentOS 5 or 6, 64-bit
  • Greenplum Database 4.3.x

Greenplum Workload Manager may be installed on the following platforms:

  • Red Hat Enterprise Linux 5.5+ or 6, 64-bit
  • CentOs 5.5+ or 6, 64-bit
  • Greenplum Database 4.3.x

Greenplum Command Center includes:

  • OpenSSL version 1.0.1o.
  • lighttpd web server version 1.4.35

Greenplum Command Center Compatibility

Pivotal Greenplum Command Center is currently certified for the EMC Data Computing Appliance (DCA) and Greenplum Database software-only environments. Command Center monitors the following for each environment:

Greenplum Data Computing Appliance

  • Greenplum Database Module 4.3.x
  • Greenplum Data Integration Accelerator (DIA) Module
  • Greenplum Data Computing Appliance Hardware (V1.2.x and V2.x)

If you have been using Greenplum’s earlier monitoring tool, Performance Monitor, with an older DCA release, we recommend you upgrade to a supported version of DCA.

Greenplum Database (Software-only Environments)

  • Greenplum Database 4.3.x

Pivotal Documentation

Pivotal Greenplum Command Center and Pivotal Greenplum Workload Manager documentation is available on the Command Center documentation site at http://gpcc.docs.pivotal.io/.

About Greenplum Command Center Release 2.3.0

Greenplum Command Center release 2.3.0 includes a beta release of the new Greenplum Command Center User Interface.

The GPCC installer has an option to include the beta UI (default yes) and the gpcmdr command has an option to run the beta (default yes).

The beta UI is installed by default on port 28090. It uses the same login credentials as the existing Command Center Console.

Greenplum Command Center Beta User Interface Enhancements

The beta Command Center Console includes the following improvements:

  • A non-Flash interface—no dependency on a third-party browser plugin.
  • Improved Active Queries list.
  • A Recent Queries list provides access to the last five minutes of completed and canceled queries.
  • Query Details for SQL text and explain plan.
  • Cluster Metrics view with aggregated charts across all hosts excluding master.
  • Host Metrics view with detailed performance metrics for each server.
  • Each view has a unique URL. Navigating forward and backward in the browser works as expected and URLs can be bookmarked.
  • URLs for individual query details can be shared and accessed directly.

See Known Issues in the Beta Command Center Console for a list of known issues in the beta UI.

The new Command Center UI is in active development. New features coming soon are:

  • Visual charts in host-level metrics view.
  • Segment health view.
  • Disk usage view.
  • Query history search.
  • Performance metrics view by time range.

About Greenplum Workload Manager Release 1.3.0

Greenplum Command Center release 2.3.0 includes Greenplum Workload Manager release 1.3.0.

Greenplum Workload Manager is included in the Pivotal Greenplum Command Center 2.3.0 package.

The Greenplum Workload Manager installer is in the Command Center home directory. You can run the installer at the command line to install or upgrade Workload Manager, or you can install Greenplum Workload Manager when you create a Greenplum Command Center instance.

The gpcmdr --setup utility asks if you want to install Greenplum Workload Manager when you create a Greenplum Command Center instance:

Would you like to install workload manager?

The Greenplum Workload Manager installer detects existing software versions and either installs or upgrades the Workload Manager software.

See “Installing Greenplum Workload Manager” in the Greenplum Workload Manager User Guide for command syntax and usage instructions for the Greenplum Workload Manager installer.

Product Enhancements in Greenplum Workload Manager Release 1.3.0

The following are enhancements and changes in Greenplum Workload Manager 1.3.0:

New Features and Improvements

  • Clearer descriptions for import/restore in built-in Workload Manager help.
  • Added --version (-v) options to the gp-wlm command.
  • Expose kevent logs as external tables in a Greenplum database.

Fixes

  • Fixed a rare bug where some queries cannot be ruled upon if the the session id of the query is not present in the list_backend_priorities() recordset.

  • In certain environments, environment variables were not being set correctly.

Installation and Upgrade Instructions


Note: Greenplum Command Center requires Adobe Flash Player version 11 or higher. If this requirement is not met, you see the following screen:


Greenplum Data Computing Appliance

Pivotal Greenplum Command Center is already installed on the DCA appliance (versions 1.2.x and 2.x).

For more information about setting up, upgrading, and configuring Pivotal Greenplum Command Center on an EMC Greenplum DCA, refer to the appropriate versions of the Greenplum Data Computing Appliance Software Upgrade Guide and Greenplum Data Computing Appliance Installation and Configuration Guide.

Greenplum Database Software-only

Instructions for installing, configuring, and upgrading your system for Pivotal Greenplum Command Center are provided in the latest Pivotal Greenplum Command Center 2.2 Administrator Guide (see Pivotal Documentation for availability).

Pivotal Greenplum Command Center replaced a monitoring tool called Greenplum Performance Monitor. You are not required to upgrade to Pivotal Greenplum Command Center; you can continue using Performance Monitor as before. To continue running Performance Monitor, do not set up Command Center. You will not be able to access new monitoring features if you decide not to upgrade. You may also run Performance Monitor and Command Center in parallel (for example, to compare functionality before upgrading). For parallel operations, assign a different port number to Command Center during setup.

Installing and Upgrading Greenplum Workload Manager

The gpcmdr --setup utility offers the option to run the Greenplum Workload Manager installer when you create a Greenplum Command Center instance. The Greenplum Workload Manager installer detects existing software versions and either installs or upgrades the Workload Manager software.

The Greenplum Workload Manager installer may also be run separately at the command line. See “Installing Greenplum Workload Manager” in the Greenplum Workload Manager User Guide for command syntax and usage instructions.

Accessing Command Center

For enhanced security, beginning with Greenplum Command Center release 1.3.0.1, the gpadmin user is not permitted to log in to the Command Center. The Command Center does not accept logins from any user on the host running GPCC configured with trust authentication in the pg_hba.conf file.

You should create new administrative, operator, and regular Command Center users for Command Center. To create a new Command Center user, first you create a Greenplum Database role, then edit the pg_hba.conf file to give that user access to Command Center. An example of this procedure is provided in the Pivotal Greenplum Command Center Administrator Guide and more detailed information can be found in the Pivotal Greenplum Database Administration Guide.

Greenplum Command Center Resolved Issues

The following table lists issues that were resolved in Pivotal Greenplum Command Center.

Issue Description Fixed In
Disk Usage is not appearing in the Dashboard or Administration tabs. 2.2.0
MPP-26312 The gpcmdr -start comand fails with ERROR: syntax error at or near "{". 2.2.0
CMDR-1988 Running gpcmdr --setup failed when copying the instance directory to the secondary master due to incorrect softlinks created by a previous GPCC release. Before running gpcmdr --setup, run the GPCC 2.0.0 gpccinstall utility, which fixes the incorrect softlinks and allows gpcmdr --setup to succeed. 2.0.0

Greenplum Command Center Known Issues

This section lists the known issues in Pivotal Greenplum Command Center 2.0. A work-around is provided where applicable.

Issue Description
CMDR-297

Heavy workload on the Greenplum Database can affect responsiveness.

The refresh rate of the Command Center user interface can be adversely affected by simultaneous heavy workload on the underlying Greenplum Database.

PT-87736724 The Command Center installer does not have support to upgrade existing Command Center instances when upgrading to a new release.

Known Issues in the Beta Command Center Console

In Beta Query Details:

  • When viewing a running query that completes with a total runtime under 20 seconds, on the next screen refresh, the query will be not found because it is below the threshold execution time for queries to be written to queries_history.

In Beta Active and Recent Queries:

  • Canceled queries will show status “Canceling” until the next 15 second data refresh, even if the cancel completed sooner.
  • There is a delay of several seconds after a query finishes before it is displayed in the Recent Queries list.
  • Refresh timer may not begin counting down until first data refresh.

Greenplum Workload Manager Known Issues

This section lists the known issues in Pivotal Greenplum Workload Manager. A work-around is provided where applicable.

Issue Description
In rare cases it is possible for installations or upgrades to fail at the cluster-health-check stage. In the event that the cluster is not healthy, re-run the Workload Manager installer with the --force option. See “Installing Greenplum Workload Manager” in the Pivotal Greenplum Workload Manager User Guide for instructions to run the installer at the command line.