Robert Nettleton created AMBARI-9733:
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Summary: Exported HDFS HA Blueprint not deploying when used for
new cluster
Key: AMBARI-9733
URL: https://issues.apache.org/jira/browse/AMBARI-9733
Project: Ambari
Issue Type: Bug
Components: ambari-server
Affects Versions: 2.0.0
Reporter: Robert Nettleton
Assignee: Robert Nettleton
Fix For: 2.0.0
Blueprints exported from HDFS HA clusters are not properly working when an
attempt is made to create a new cluster based on this exported Blueprint.
Steps to reproduce:
1. Use the Ambari UI to create a 3-node cluster with HDFS enabled
2. Use the Ambari UI HA Wizard to enable HDFS NameNode HA
3. Export a Blueprint from the running cluster using the REST API
4. Attempt to use this Blueprint to create a new, separate cluster
There are two possible failures that this bug documents:
1. The cluster startup attempt will fail with a "400" status error, and the
associated error message will mention that no instances of
"SECONDARY_NAMESERVER" are found for topology mapping. This is an error in the
Blueprint processor, since the "SECONDARY_NAMESERVER" cannot be present in an
HDFS HA scenario.
2. The cluster startup attempt will fail with a "400" status error, and the
associated error message will mention that either no instances of "NAMESERVER"
are found for topology mapping, or more than one instance has been found. This
is actually an error in the handling of an "hbase-site" property,
"hbase.rootdir", that can refer to an HDFS HA nameservice address in HA mode,
rather than refer to an individual NameServer.
The Blueprint Configuration processor needs to be updated to handle these
HA-specific cases properly.
In a future release, it may make sense to refactor the stack definitions to
include information about properties that have different meanings/values in an
HA scenario. For this release (Ambari 2.0), the fixes should be made in the
Blueprint configuration processor.
I'm working on a patch for this now, and will be submitting shortly.
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