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https://issues.apache.org/jira/browse/HADOOP-4787?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Amareshwari Sriramadasu updated HADOOP-4787:
--------------------------------------------

    Attachment: patch-4787.txt

Attaching patch with fix.

Hemant, as I'm not able reproduce this on my machine, can you apply this patch 
and see if the test fails again.
One reason I could think is that client is inquiring for the clusterStatus, 
while the JT is blacklisting. Also I changed _mapred.max.tracker.failures_ to 
job level configuration in the test.

> TestTrackerBlacklistAcrossJobs fails randomly
> ---------------------------------------------
>
>                 Key: HADOOP-4787
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4787
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred, test
>            Reporter: Hemanth Yamijala
>            Assignee: Amareshwari Sriramadasu
>            Priority: Blocker
>             Fix For: 0.20.0
>
>         Attachments: patch-4787.txt
>
>
> While fixing HADOOP-4786, I found that TestTrackerBlacklistAcrossJobs is 
> failing randomly.

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