[jira] [Created] (YARN-691) Invalid NaN values in Hadoop REST API JSON response

["Kendall Thrapp (JIRA)" <ji...@apache.org>]

Kendall Thrapp created YARN-691:
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             Summary: Invalid NaN values in Hadoop REST API JSON response
                 Key: YARN-691
                 URL: https://issues.apache.org/jira/browse/YARN-691
             Project: Hadoop YARN
          Issue Type: Bug
          Components: resourcemanager
    Affects Versions: 0.23.6
            Reporter: Kendall Thrapp


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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