[SPARK-16757] Set up Spark caller context to HDFS and YARN#14659

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Commits on Aug 16, 2016

[SPARK-16757] Set up Spark caller context to HDFS
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Commits on Aug 20, 2016

Use 'getOrElse' instead of 'get'
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Commits on Aug 22, 2016

Remove spaces in the value of Spark caller context
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Add Application ID and Attempt ID in the value of the caller context when Yarn client and ApplicationMaster invoke Hadoop caller context API
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Add application ID and attempt ID to the value of the caller context when 'Task' invoke Hadoop caller context API
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Commits on Sep 1, 2016

Add an unit test
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Commits on Sep 15, 2016

Add a CallerContext call, update java doc, and shorten caller context string
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Commits on Sep 20, 2016

Update the content of the caller context and add more description for CallerContext class
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Commits on Sep 22, 2016

Update the content of the caller context string
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Commits on Sep 26, 2016

rename local vals and remove the '@since'
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