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https://issues.apache.org/jira/browse/HDFS-9922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ming Ma reopened HDFS-9922:
---------------------------

> Upgrade Domain placement policy status marks a good block in violation when 
> there are decommissioned nodes
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-9922
>                 URL: https://issues.apache.org/jira/browse/HDFS-9922
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Chris Trezzo
>            Assignee: Chris Trezzo
>            Priority: Minor
>             Fix For: 2.9.0, 3.0.0-alpha1
>
>         Attachments: HDFS-9922-trunk-v1.patch, HDFS-9922-trunk-v2.patch, 
> HDFS-9922-trunk-v3.patch, HDFS-9922-trunk-v4.patch
>
>
> When there are replicas of a block on a decommissioned node, 
> BlockPlacementStatusWithUpgradeDomain#isUpgradeDomainPolicySatisfied returns 
> false when it should return true. This is because numberOfReplicas is the 
> number of in-service replicas for the block and upgradeDomains.size() is the 
> number of upgrade domains across all replicas of the block. Specifically, we 
> hit this scenario when numberOfReplicas is equal to upgradeDomainFactor and 
> upgradeDomains.size() is greater than numberOfReplicas.
> {code}
> private boolean isUpgradeDomainPolicySatisfied() {
>     if (numberOfReplicas <= upgradeDomainFactor) {
>       return (numberOfReplicas == upgradeDomains.size());
>     } else {
>       return upgradeDomains.size() >= upgradeDomainFactor;
>     }
>   }
> {code}



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