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https://issues.apache.org/jira/browse/HIVE-11946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14908537#comment-14908537
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Jimmy Xiang commented on HIVE-11946:
------------------------------------
Good question. Vector is synchronized while ArrayList is not. Parameter
actualMessages is updated in aother thread, so the assertion method may fail if
it doesn't see the change without synchronization.
> TestNotificationListener is flaky
> ---------------------------------
>
> Key: HIVE-11946
> URL: https://issues.apache.org/jira/browse/HIVE-11946
> Project: Hive
> Issue Type: Test
> Reporter: Jimmy Xiang
> Assignee: Jimmy Xiang
> Priority: Minor
> Fix For: 1.3.0, 2.0.0
>
> Attachments: HIVE-11946.1.patch
>
>
> {noformat}
> expected:<[CREATE_DATABASE, CREATE_TABLE, ADD_PARTITION, ALTER_PARTITION,
> DROP_PARTITION, ALTER_TABLE, DROP_TABLE, DROP_DATABASE]> but
> was:<[CREATE_DATABASE, CREATE_TABLE, ADD_PARTITION, ALTER_PARTITION,
> DROP_PARTITION, ALTER_TABLE, DROP_TABLE]>
> Stacktrace
> java.lang.AssertionError: expected:<[CREATE_DATABASE, CREATE_TABLE,
> ADD_PARTITION, ALTER_PARTITION, DROP_PARTITION, ALTER_TABLE, DROP_TABLE,
> DROP_DATABASE]> but was:<[CREATE_DATABASE, CREATE_TABLE, ADD_PARTITION,
> ALTER_PARTITION, DROP_PARTITION, ALTER_TABLE, DROP_TABLE]>
> at org.junit.Assert.fail(Assert.java:88)
> at org.junit.Assert.failNotEquals(Assert.java:743)
> at org.junit.Assert.assertEquals(Assert.java:118)
> at org.junit.Assert.assertEquals(Assert.java:144)
> at
> org.apache.hive.hcatalog.listener.TestNotificationListener.tearDown(TestNotificationListener.java:114)
> {noformat}
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