Robert Nettleton created AMBARI-7738:
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Summary: Blueprints: Cluster deployment attempt in HDP 2.1 fails
without Yarn APP_TIMELINE_SERVER
Key: AMBARI-7738
URL: https://issues.apache.org/jira/browse/AMBARI-7738
Project: Ambari
Issue Type: Bug
Components: ambari-server
Affects Versions: 1.7.0
Reporter: Robert Nettleton
Assignee: Robert Nettleton
Fix For: 1.7.0
When a user attempts to create an HDP 2.1 cluster based on a Blueprint that
does not contain the following service:
APP_TIMELINE_SERVER
The cluster deployment will fail during the configuration step, and the
following error will be sent back to the REST client:
"{
"status" : 400,
"message" : "Unable to update configuration property with topology
information. Component 'APP_TIMELINE_SERVER' is not mapped to any host group or
is mapped to multiple groups."
}"
The Blueprint configuration processor currently includes a statically-defined
list of properties that are candidates for topology updates. This basically
means that the correct host information is added to these configuration
properties when the cluster deployment is being prepared.
Some recent changes to the Ambari trunk have included some Yarn configuration
properties that are related to the Yarn Application Timeline Service (or ATS
for short).
The HDP 2.1 stack defines the cardinality of the APP_TIMELINE_SERVER to be
"0-1", which means that zero or 1 instances of this service can be present in
the cluster when Yarn is used. This cardinality was selected because the
APP_TIMELINE_SERVER was considered a technical preview in HDP 2.1, and so was
not required by the HDP 2.1 stack. This is why a Blueprint can be processed
without the ATS, even if blueprint validation is left on.
The BlueprintConfigurationProcessor class includes the following static
references to the APP_TIMELINE_SERVER process:
"// APP_TIMELINE_SERVER
yarnSiteMap.put("yarn.timeline-service.address", new
SingleHostTopologyUpdater("APP_TIMELINE_SERVER"));
yarnSiteMap.put("yarn.timeline-service.webapp.address", new
SingleHostTopologyUpdater("APP_TIMELINE_SERVER"));
yarnSiteMap.put("yarn.timeline-service.webapp.https.address", new
SingleHostTopologyUpdater("APP_TIMELINE_SERVER"));"
The BlueprintConfigurationProcessor needs to be modified such that the topology
substitution phase for these properties is not attempted when the
APP_TIMELINE_SERVER is not included in an HDP 2.1 Blueprint.
This problem will likely be constrained to the HDP 2.1 stack, since the ATS
will likely have a cardinality of "1" in future stack definitions after HDP
2.1.
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