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https://issues.apache.org/jira/browse/HADOOP-12699?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Chen updated HADOOP-12699:
-------------------------------
    Attachment: HADOOP-12699.repro.patch

Attached a patch to reproduce the failure, as I described above.
I'll post a fix soon, so this reproduce patch also includes my proposed fix. 
Commenting out the {{conf.setBoolean}} in {{TestKMS#testKMSProvider}} will 
surface the failure.

> TestKMS#testKMSProvider intermittently fails during 'test rollover draining'
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-12699
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12699
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>         Attachments: HADOOP-12699.01.patch, HADOOP-12699.repro.patch
>
>
> I've seen several failures of testKMSProvider, all failed in the following 
> snippet:
> {code}
>         // test rollover draining
>         KeyProviderCryptoExtension kpce = KeyProviderCryptoExtension.
>             createKeyProviderCryptoExtension(kp);
>         .....
>         EncryptedKeyVersion ekv1 = kpce.generateEncryptedKey("k6");
>         kpce.rollNewVersion("k6");
>         EncryptedKeyVersion ekv2 = kpce.generateEncryptedKey("k6");
>         Assert.assertNotEquals(ekv1.getEncryptionKeyVersionName(),
>             ekv2.getEncryptionKeyVersionName());
> {code}
> with error message
> {quote}Values should be different. Actual: k6@0{quote}



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