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https://issues.apache.org/jira/browse/YARN-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16361861#comment-16361861
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Akira Ajisaka commented on YARN-7924:
-------------------------------------

In the following code, {{Collections.EMPTY_SET}} can be replaced with 
{{Collections.emptySet()}} to avoid unchecked assignment.
{code:java}
public Set<String> getAllocationTags() {
  return Collections.EMPTY_SET;
}{code}

> Fix javac warning in NMContainerStatus.java
> -------------------------------------------
>
>                 Key: YARN-7924
>                 URL: https://issues.apache.org/jira/browse/YARN-7924
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Akira Ajisaka
>            Priority: Minor
>              Labels: newbie
>
> There is a warning in NMContainerStatus.java when compiling the source code 
> and it can be fixed easily.
> {noformat}
> [WARNING] 
> /home/centos/git/hadoop/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/api/protocolrecords/NMContainerStatus.java:
>  
> /home/centos/git/hadoop/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/api/protocolrecords/NMContainerStatus.java
>  uses unchecked or unsafe operations.{noformat}



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