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Knowledge Base

Changing vCloud Director cache.tenantcache.maxElementsInMemory and cache.samlMetadataCache.maxElementsInMemory values to resolve excessive CPU usage (59138)

Last Updated: 1/29/2019Categories: TroubleshootingTotal Views: 3964Language:
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Symptoms

There is high CPU usage on the vCloud Director Cell Servers.

You encounter slow task execution times for operations in vCloud Director, such as vApp Power On tasks.

In /opt/vmware/vcloud-director/logs/vcloud-container-debug.log on the vCloud Director Cell Servers, you find an excessive amount of entries regarding metadata refresh for the Organizations:

| DEBUG    | metadataRefreshTimer      | AbstractReloadingMetadataProvider | Beginning refresh of metadata from 'orgname' |

The vcloud-container-debug.log files on the vCloud Director Cell Servers rotate rapidly due to excessive amount of metadataRefreshTimer entries.

Note: The preceding log excerpts are only examples. Date, time, and environmental variables may vary depending on your environment.

Cause

This issue can occur if there are hundreds or thousands of Organizations present in vCloud Director which need to be loaded into memory for the metadata refresh task.

Resolution

To resolve this issue, the performance can be improved by allowing the vCloud Director Cells to load more objects into memory at a time by setting the cache.tenantcache.maxElementsInMemory and cache.samlMetadataCache.maxElementsInMemory configuration parameters by taking the following steps:

Open an SSH session to the first vCloud Director Cell in the environment.

Backup the existing vCloud Director Cell configuration file, for example:

cp /opt/vmware/vcloud-director/etc/global.properties /opt/vmware/vcloud-director/etc/global.properties.yyyymmdd.bak

Edit the global.properties file and add lines for cache.tenantcache.maxElementsInMemory and cache.samlMetadataCache.maxElementsInMemory. The value set should be greater than the total number of Organizations in the vCloud Director instance:

vi /opt/vmware/vcloud-director/etc/global.properties

# maxElementsInMemory settings
cache.tenantcache.maxElementsInMemory=2000
cache.samlMetadataCache.maxElementsInMemory=2000

Note: Setting these parameters can increase memory consumption on the vCloud Director Cells and as such the Java Heap settings may need to be increased as per Changing VMware vCloud Director Java heap size to prevent java.lang.OutOfMemoryError messages

Restart the vCloud Director Cell Services for the changes to take effect.

Repeat this process for all vCloud Director Cells in the server cluster.

Related Information

For more information on stopping and starting the vCloud Director Cell Services, see the Use the Cell Management Tool to Quiesce and Shut Down a Cell section of the vCloud Director documentation.

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