Akira Ajisaka created HDFS-15783:
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Summary: 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
{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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