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https://issues.apache.org/jira/browse/HADOOP-15223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16362712#comment-16362712
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Akira Ajisaka commented on HADOOP-15223:
----------------------------------------
Thanks [~zhenyi] for the patch! Some comments:
1. Would you remove existing {{@SuppressWarning("unchecked")}} annotations if
the annotation is unnecessary? For example, the following annotation is
unnecessary after the change.
{code}
@SuppressWarnings("unchecked")
public Map<String, String> getAttributes() {
return (attributes == null) ? Collections.emptyMap() : attributes;
}
{code}
2. There are some remaining {{Collections.EMPTY_MAP}} and
{{Collections.EMPTY_SET}}. Would you replace them?
3. I noticed {{Collections.EMPTY_LIST}} can be replaced with
{{Collections.emptyList()}} as well. Would you replace them?
> Replace Collections.EMPTY_SET and EMPTY_MAP with emptySet() and emptyMap()
> when available
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-15223
> URL: https://issues.apache.org/jira/browse/HADOOP-15223
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Akira Ajisaka
> Assignee: fang zhenyi
> Priority: Minor
> Labels: newbie
> Attachments: HADOOP-15223.001.patch
>
>
> The use of {{Collections.EMPTY_SET}} and {{Collections.EMPTY_MAP}} often
> causes unchecked assignment and it should be replaced with
> {{Collections.emptySet()}} and {{Collections.emptyMap()}}.
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