Siddharth Wagle created AMBARI-4378:
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Summary: Rolling restart toleration count - support absolute
values only
Key: AMBARI-4378
URL: https://issues.apache.org/jira/browse/AMBARI-4378
Project: Ambari
Issue Type: Task
Components: controller
Affects Versions: 1.5.0
Reporter: Siddharth Wagle
Assignee: Siddharth Wagle
Fix For: 1.5.0
Attachments: AMBARI-4378.patch
The "task_failure_tolerance" applies to percentage of tasks created thus far
and for the present request, since we do not now how many tasks the proceeding
request will create. Consider it as a cumulative count, so in the first batch,
1 out of 2 tasks failed, which is 50% failure and allowed tolerance is 25% so
this will fail.
Different test cases:
Try 4 batches of 1 host each and make the 3rd batch fail, in this case failure
when 3rd batch fails = 1/3 : 33.33% failure.
So if you set "task_failure_tolerance" to 40, 4th batch should start, and if
you set it to 25, 4th batch will not start.
For a Rolling restart scenario and absolute count makes more sense.
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