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https://issues.apache.org/jira/browse/YARN-5552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15469779#comment-15469779
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Tao Jie commented on YARN-5552:
-------------------------------
Thank you for your comment,[~leftnoteasy]!
Storing local variables in builder here is to give a default value for fields
and avoid potential NPE. It is better to set default value also in builder
constructor like:
{quote}
private ResourceRequestBuilder() {
ResourceRequest request = Records.newRecord(ResourceRequest.class);
request.setResourceName(ResourceRequest.ANY);
request.setPriority(Priority.newInstance(0));
...
}
{quote}
> Add Builder methods for common yarn API records
> -----------------------------------------------
>
> Key: YARN-5552
> URL: https://issues.apache.org/jira/browse/YARN-5552
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: Arun Suresh
> Assignee: Tao Jie
> Attachments: YARN-5552.000.patch, YARN-5552.001.patch,
> YARN-5552.002.patch, YARN-5552.003.patch
>
>
> Currently yarn API records such as ResourceRequest, AllocateRequest/Respone
> as well as AMRMClient.ContainerRequest have multiple constructors /
> newInstance methods. This makes it very difficult to add new fields to these
> records.
> It would probably be better if we had Builder classes for many of these
> records, which would make evolution of these records a bit easier.
> (suggested by [~kasha])
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