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https://issues.apache.org/jira/browse/HDFS-15783?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Akira Ajisaka reassigned HDFS-15783:
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Assignee: Akira Ajisaka
> Speed up BlockPlacementPolicyRackFaultTolerant#verifyBlockPlacement
> -------------------------------------------------------------------
>
> Key: HDFS-15783
> URL: https://issues.apache.org/jira/browse/HDFS-15783
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: block placement
> Reporter: Akira Ajisaka
> Assignee: Akira Ajisaka
> Priority: Major
>
> {code:java}
> Set<String> racks = new TreeSet<>();
> for (DatanodeInfo dn : locs) {
> racks.add(dn.getNetworkLocation());
> }
> return new BlockPlacementStatusDefault(racks.size(), numberOfReplicas,
> clusterMap.getNumOfRacks());{code}
> Here, HashMap should be used instead of TreeSet.
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