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https://issues.apache.org/jira/browse/HDFS-15783?focusedWorklogId=537727&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-537727
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ASF GitHub Bot logged work on HDFS-15783:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 19/Jan/21 10:11
Start Date: 19/Jan/21 10:11
Worklog Time Spent: 10m
Work Description: aajisaka opened a new pull request #2626:
URL: https://github.com/apache/hadoop/pull/2626
JIRA: https://issues.apache.org/jira/browse/HDFS-15783
- Remove the usage of `TreeSet#add`, whose time complexity is `O(logN)`.
- This fix is similar to https://issues.apache.org/jira/browse/HDFS-14102
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Issue Time Tracking
-------------------
Worklog Id: (was: 537727)
Remaining Estimate: 0h
Time Spent: 10m
> 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
> Time Spent: 10m
> Remaining Estimate: 0h
>
> {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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