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From "Kendall Thrapp (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-691) Invalid NaN values in Hadoop REST API JSON response
Date Thu, 16 May 2013 20:31:16 GMT
Kendall Thrapp created YARN-691:
-----------------------------------

             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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