Details
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Bug
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Status: Resolved
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Critical
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Resolution: Fixed
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2.0.0
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None
Description
In order to reproduce this problem:
1. Use the Ambari UI to deploy a multi-node Yarn cluster
2. Use the Ambari UI wizard to enable Yarn ResourceManager High-Availability
3. Use the Ambari REST API to request an exported Blueprint based on the running cluster.
When exporting a Blueprint from a running cluster that utilizes Yarn ResourceManager High-Availability (HA), the following Yarn configuration properties (HA-related) are not properly exported, and hostname information is included in the exported Blueprint.
The following properties are not exported properly:
yarn.resourcemanager.hostname.$NAME_OF_RM
Note: $NAME_OF_RM indicates the name of a running resource manager in Yarn. In an HA deployment scenario, this property name will include the name of a resource manager, and will point towards the host that this resource manager is deployed on. There will be one instance of this property per resource manager. For most scenarios, this means there will be at most 2 of these properties to consider.
yarn.resourcemanager.zk-address
Note: This property should refer to a comma-separate list of Zookeeper servers.
In each of these cases, the Blueprint configuration processor should strip out the hostname information, and substitute the name of the host group that includes this host service.
These changes should be implemented in the BlueprintConfigurationProcessor class.
This bug will not keep a Yarn HA Blueprint from deploying, but will affect the round-tripping process of deploying a new cluster based on a Blueprint, since the hostname information would need to be manually updated if the host names have changed for the cluster deployment.
This bug will also affect the usage of %HOSTGROUP% syntax in Yarn HA properties, since the config processor is not properly handling the export of these properties from a running cluster, nor is is properly handling subsitution at cluster deployment time for Yarn HA properties.
AMBARI-10524 also reports that the following Yarn properties are not properly exported:
"yarn.resourcemanager.webapp.https.address" and "yarn.resourcemanager.zk-address"
Work on this bug should also verify that all Yarn properties with hostnames are properly exported, meaning that no hostnames should be included in the exported Blueprint.
