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Known Issues in Cloudera Manager 7.6.5

Known issues in Cloudera Manager 7.6.5

Cloudera bug: OPSAPS-59764: Memory leak in the Cloudera Manager agent while downloading the parcels.

When using the M2Crpyto library in the Cloudera Manager agent to download parcels causes a memory leak.

The Cloudera Manager server requires parcels to install a cluster. If any of the URLs of parcels are modified, then the server provides information to all the Cloudera Manager agent processes that are installed on each cluster host.

The Cloudera Manager agent then starts checking for updates regularly by downloading the manifest file that is available under each of the URLs. However, if the URL is invalid or not reachable to download the parcel, then the Cloudera Manager agent shows a 404 error message and the memory of the Cloudera Manager agent process increases due to a memory leak in the file downloader code of the agent.

To prevent this memory leak, ensure all URLs of parcels in Cloudera Manager are reachable. To achieve this, delete all unused and unreachable parcels from the Cloudera Manager parcels page.

Cloudera bug: OPSAPS-63744: Restart of ECS needed after upgrade to Cloudera Manager 7.6.5.
If you have ECS deployed in your clusters, after upgrading Cloudera Manager to version 7.6.5, do the following in the Cloudera Manager Admin Console:
  1. Restart the ECS Cluster. Go to the ECS cluster, click the actions menu and select Restart.
  2. Unseal the Vault. Go to the ECS service and click Actions > Unseal .
OPSAPS-65189: Accessing Cloudera Manager through Knox displays the following error:

Bad Message 431 reason: Request Header Fields Too Large

Workaround: Modify the Cloudera Manager Server configuration /etc/default/cloudera-scm-server file to increase the header size from 8 KB, which is the default value, to 65 KB in the Java options as shown below:
export CMF_JAVA_OPTS="...existing options...
-Dcom.cloudera.server.cmf.WebServerImpl.HTTP_HEADER_SIZE_BYTES=65536
-Dcom.cloudera.server.cmf.WebServerImpl.HTTPS_HEADER_SIZE_BYTES=65536"
OPSAPS-65213: Ending the maintenance mode for a commissioned host with either an Ozone DataNode role or a Kafka Broker role running on it, might result in an error.

You may see the following error if you end the maintenance mode for Ozone and Kafka services from Cloudera Manager when the roles are not decommissioned on the host.

Execute command Recommission and Start on service OZONE-1
Failed to execute command Recommission and Start on service OZONE-1
Recommission and Start
Command Recommission and Start is not currently available for execution.
To resolve this issue, use the API support feature to take the host out of maintenance mode.
  1. Log into Cloudera Manager as an Administrator.
  2. Go to Hosts > All Hosts.
  3. Select the host for which you need to end the maintenance mode from the available list and click the link to open the host details page.
  4. Copy the Host ID from the Details section.
  5. Go to Support > API Explorer.
  6. Locate and click the /hosts/{hostId}/commands/exitMaintenanceMode endpoint for HostsResource API to view the API parameters.
  7. Click Try it out.
  8. Enter the ID of your host in the hostId field.
  9. Click Execute.
  10. Verify that the maintenance mode status is cleared for the host by checking the Server response code.

    The operation is successful if the API response code is 200.

If you need any guidance during this process, contact Cloudera support for further assistance.