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https://issues.apache.org/jira/browse/NIFI-5202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16477777#comment-16477777
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ASF GitHub Bot commented on NIFI-5202:
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GitHub user mattyb149 opened a pull request:
https://github.com/apache/nifi/pull/2709
NIFI-5202: Fixed timing issue in TestListDatabaseTables
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This closes #2709
----
----
> TestListDatabaseTables timing issue
> -----------------------------------
>
> Key: NIFI-5202
> URL: https://issues.apache.org/jira/browse/NIFI-5202
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Reporter: Mark Payne
> Assignee: Matt Burgess
> Priority: Major
>
> I sometimes see TestListDatabaseTables fail in Travis-CI:
> {code:java}
> [INFO] Results:
> [INFO]
> [ERROR] Failures:
> [ERROR] TestListDatabaseTables.testListTablesMultipleRefresh:218
> expected:<1> but was:<2>
> [INFO] {code}
> It appears to be a timing issue. When I run it on my laptop, it always
> succeeds, as-is. However, I can easily reproduce the error above if I update
> the unit test by adding a Thread.sleep at line 214:
> {code:java}
> assertEquals("2",
> results.get(0).getAttribute(ListDatabaseTables.DB_TABLE_COUNT));
> runner.clearTransferState();
> Thread.sleep(500);
> // Add another table immediately, the first table should not be
> listed again but the second should
> stmt.execute("create table TEST_TABLE2 (id integer not null, val1
> integer, val2 integer, constraint my_pk2 primary key (id))");
> stmt.close();{code}
> With that Thread.sleep(500) added in, it always fails on my laptop. This
> essentially is mimicking a slower environment, such as travis-ci.
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