Harry Zhang created HELIX-753:
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Summary: record top state handoff finished in single cluster data
cache refresh
Key: HELIX-753
URL: https://issues.apache.org/jira/browse/HELIX-753
Project: Apache Helix
Issue Type: Bug
Reporter: Harry Zhang
Assignee: Harry Zhang
Currently we are calculating top state handoff duration by doing the following:
- record missing top state when we see a top state missing
- record top state come back when we see it come back
- report top state handoff duration
This is perfectly fine for non-P2P state transitions as the entire top state
handoff process will always finish for >= 2 pipeline runs. However, for P2P
enabled clusters, top state handoff are quick, and if it is quicker than
cluster data refresh stage latency, we will lose a lot of short top state
handoffs, which make the number miserable on ingraph.
We need to revise top state handoff metrics implementation so we don't lose
data point statistically (i.e. we are losing all short handoffs now).
AC:
- revise impl so we catch those short top state hand-offs
- write new tests to catch the fix if needed
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