jihoonson commented on a change in pull request #10517:
URL: https://github.com/apache/druid/pull/10517#discussion_r507928409
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File path: integration-tests/README.md
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@@ -385,3 +386,12 @@ Please be mindful when adding tests to the
"AllParallelizedTests" test tag that
other tests from the same class at the same time. i.e. test does not
modify/restart/stop the druid cluster or other dependency containers,
test does not use excessive memory starving other concurent task, test does
not modify and/or use other task,
supervisor, datasource it did not create.
+
+### Limitation of Druid cluster in Travis environment
+
+By default, integration tests are run in Travis environment on commits made to
open PR. These integration test jobs are
+required to pass for a PR to be elligible to be merged. Here are known issues
and limitations to the Druid docker cluster
+running in Travis machine that may cause the tests to fail:
+- Number of concurrent running tasks. Although the default Druid cluster
config sets the maximum number of tasks (druid.worker.capacity) to 10,
+the actual maximum can be lower depending on the type of the tasks. For
example, running 2 range partitioning compaction tasks with 2 subtasks each
+(for a total of 6 tasks) concurrently can cause the cluster to intermittently
fails.
Review comment:
typo: `fails` -> `fail`
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