Add a config option to print DAG.#4257

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KaiXinXiaoLei wants to merge 5 commits intoapache:masterfrom

KaiXinXiaoLei:DAGprint

Commits on Jan 28, 2015

add a option to print DAG
KaiXinXiaoLei
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Commits on Jan 29, 2015

change the file.
KaiXinXiaoLei
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Commits on Feb 10, 2015

change config option
KaiXinXiaoLei
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change log info
KaiXinXiaoLei
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change log info
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