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https://issues.apache.org/jira/browse/KUDU-2033?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexey Serbin reassigned KUDU-2033:
---
Assignee: (was: Edward Fancher)
> Add a 'torture' scenario to verify Java client's behavior during fail-over
> ---
>
> Key: KUDU-2033
> URL: https://issues.apache.org/jira/browse/KUDU-2033
> Project: Kudu
> Issue Type: Test
> Components: client, java
>Reporter: Alexey Serbin
>Priority: Major
> Labels: newbie, newbie++
>
> For the Kudu Java client we have {{TestLeaderFailover}} test which verifies
> how the client handles the tablet server fail-over scenario. However, the
> test covers only one fail-over event and mainly performs write operations
> while the backend handles the 'unexpected crash' of the tablet server.
> It would be nice to add more tests which cover the client's fail-over
> behavior:
> * Add the mixed workload scenario, i.e. combine inserts/scans during the
> fail-over. Running the scans would not only verify that the data eventually
> reaches the destination, but verify that the client automatically retries the
> scan operations and eventually succeeds reading the data from the cluster.
> * Induce more fail-over events while running the scenario, i.e. pause and
> then resume the tservers processes many more times and run the test longer.
> This is to spot possible bugs during the transition processes and occurrence
> of multiple fail-over events.
> * In the mixed workload scenarios, run scan operations in READ_AT_SNAPSHOT
> mode with different selectors: LEADER_ONLY and CLOSEST_REPLICA. That's to
> cover the retry code paths for both cases (as of now, I could see only the
> LEADER_ONLY path covered, but I might be mistaken).
> The general idea is to make sure the Java client during fail-over events:
> * Retries write and read operations automatically on an error happened due to
> a fail-over event.
> * Does not silently lose any data: if the client cannot send the data due to
> timeout or running out of retry attempts, it should report on that.
>
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