Bharath Kumarasubramanian created SAMZA-2633:
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Summary: Rolling deployment/upgrade causes downtime for processors
for the entire deployment window
Key: SAMZA-2633
URL: https://issues.apache.org/jira/browse/SAMZA-2633
Project: Samza
Issue Type: Bug
Reporter: Bharath Kumarasubramanian
Assignee: Bharath Kumarasubramanian
*Problem*:
At LinkedIn, we noticed several standalone users complained about lag/downtime
during rolling deployments/upgrades.
*Description*:
During rolling upgrades, the current debounce timer gets extended every time
when there is a quorum change notification. As a result, processors that were
upgraded earlier in the deployment window remain unavailable waiting for work
assignment. In some scenarios, this cause processors to be unavailable for 20
minutes or so depending on the size of the quorum and the debounce time
configuration.
*Impact*:
Partitions that were stopped for initial processors as part of upgrade remain
unassigned for the entire deployment window which can result in processing lag.
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