Nirmal Fernando created STRATOS-625:
---------------------------------------
Summary: Error in scale down logic
Key: STRATOS-625
URL: https://issues.apache.org/jira/browse/STRATOS-625
Project: Stratos
Issue Type: Bug
Components: Autoscaler
Affects Versions: 4.0.0 Alpha
Reporter: Nirmal Fernando
Assignee: Nirmal Fernando
Priority: Blocker
Fix For: 4.0.0 RC1
Seems like following current scale down rule is not accurate.
scaleDown : Boolean() from ((rifReset && (rifPredictedValue < rifAverageLimit *
0.1)) || (mcReset && (mcPredictedValue < mcAverageLimit * 0.1)) || (laReset &&
(laPredictedValue < laAverageLimit * 0.1)))
Note the 'OR' conditions. If you read this, it'll mean that system would scale
down if any of the factors resulted to drop down than its threshold, despite
higher requests in one of the factors.
IMO we should use 'AND's instead of 'OR's.
Proposed fix:
scaleDown : Boolean() from ((rifReset && (rifPredictedValue < rifAverageLimit *
0.1)) && (mcReset && (mcPredictedValue < mcAverageLimit * 0.1)) && (laReset &&
(laPredictedValue < laAverageLimit * 0.1)))
--
This message was sent by Atlassian JIRA
(v6.2#6252)
