[jira] [Created] (NIFI-5202) TestListDatabaseTables timing issue

["Mark Payne (JIRA)" <ji...@apache.org>]

Mark Payne created NIFI-5202:
--------------------------------

             Summary: 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


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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