Sandor Magyari created AMBARI-14665:
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Summary: Race condition problem in ServiceComponentHostImpl when
provisioning cluster with Blueprint
Key: AMBARI-14665
URL: https://issues.apache.org/jira/browse/AMBARI-14665
Project: Ambari
Issue Type: Bug
Affects Versions: 2.2.0
Reporter: Sandor Magyari
Assignee: Sandor Magyari
Fix For: 2.2.1
Sometimes when provisioning cluster with Blueprint, there are state
inconsistencies between state and desired_state of components on a given host.
Usually desired_state is still INSTALLED while state is STARTED.
Analyzing the logs of affected components, the problem seems to be a race
condition in ServiceComponentHostImpl. This is modified by ActionScheduler,
HeartBeatMonitor and HostComponentResourceProvider as well which is used when
creating INSTALL and START tasks, modifying desired states.
ServiceComponentHostImpl state is stored in two entities:
HostComponentStateEntity, HostComponentDesiredStateEntity. Regardless of
changes made both entities are merged back to db but only one is fetched from
db before merge.
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