[jira] [Updated] (YARN-1479) Invalid NaN values in Hadoop REST API JSON response

["Chen He (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-1479?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chen He updated YARN-1479:
--------------------------

    Attachment: Yarn-1479v2.patch

> Invalid NaN values in Hadoop REST API JSON response
> ---------------------------------------------------
>
>                 Key: YARN-1479
>                 URL: https://issues.apache.org/jira/browse/YARN-1479
>             Project: Hadoop YARN
>          Issue Type: Improvement
>    Affects Versions: 0.23.6, 2.0.4-alpha
>            Reporter: Kendall Thrapp
>            Assignee: Chen He
>             Fix For: 2.3.0
>
>         Attachments: Yarn-1479.patch, Yarn-1479v2.patch
>
>
> I've been occasionally coming across instances where Hadoop's Cluster Applications REST API (http://hadoop.apache.org/docs/r0.23.6/hadoop-yarn/hadoop-yarn-site/ResourceManagerRest.html#Cluster_Applications_API) has returned JSON that PHP's json_decode function failed to parse.  I've tracked the syntax error down to the presence of the unquoted word NaN appearing as a value in the JSON.  For example:
> "progress":NaN,
> NaN is not part of the JSON spec, so its presence renders the whole JSON string invalid.  Hadoop needs to return something other than NaN in this case -- perhaps an empty string or the quoted string "NaN".



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