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https://issues.apache.org/jira/browse/HADOOP-18236?focusedWorklogId=775603&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-775603
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ASF GitHub Bot logged work on HADOOP-18236:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 28/May/22 01:39
Start Date: 28/May/22 01:39
Worklog Time Spent: 10m
Work Description: ZanderXu closed pull request #4320: HADOOP-18236.
Remove duplicate locks in NetworkTopology
URL: https://github.com/apache/hadoop/pull/4320
Issue Time Tracking
-------------------
Worklog Id: (was: 775603)
Time Spent: 1h 40m (was: 1.5h)
> Remove duplicate locks in NetworkTopology
> -----------------------------------------
>
> Key: HADOOP-18236
> URL: https://issues.apache.org/jira/browse/HADOOP-18236
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: ZanderXu
> Assignee: ZanderXu
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> During reading the hadoop NetworkTopology.java, I suspect there is a
> duplicate lock.
> chooseRandom(line 532), and code is:
> {code:java}
> final int availableNodes;
> if (excludedScope == null) {
> availableNodes = countNumOfAvailableNodes(scope, excludedNodes);
> } else {
> netlock.readLock().lock();
> try {
> availableNodes = countNumOfAvailableNodes(scope, excludedNodes) -
> countNumOfAvailableNodes(excludedScope, excludedNodes);
> } finally {
> netlock.readLock().unlock();
> }
> } {code}
> All the places where called `chooseRandom` have the global read lock, so the
> internal read lock is duplicated.
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