Aravindan Vijayan created AMBARI-21593:
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Summary: cp /tmp/ambari-metrics-timelineservice-2.5.1.0.0.jar
/usr/lib/ambari-metrics-collector/ambari-metrics-timelineservice-2.5.2.0.191.jar
Key: AMBARI-21593
URL: https://issues.apache.org/jira/browse/AMBARI-21593
Project: Ambari
Issue Type: Bug
Components: ambari-metrics
Affects Versions: 2.5.2
Reporter: Aravindan Vijayan
Assignee: Aravindan Vijayan
Priority: Blocker
Fix For: 2.5.2
PROBLEM
When 2 metric collectors are started up simultaneously, both of them fail to
start.
BUG
There exists a race condition in the Metric Collector HA controller
initialization which was introduced through AMBARI-20179. When a helix
controller instance finds that the /ambari-metrics-collector znode exists but a
child node does not exists, it deletes the entire znode and recreates. If
another controller instance also initializes simultaneously, a race condition
can occur wherein each instance will end up cancelling the effort of the other.
FIX
Do not delete and recreate the znode. Wait and retry for a few seconds to check
if /ambari-metrics-collector was fully initailized.
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