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Hi WangYQ, For code related suggestions if you feel there is an improvement or bug it is preferrable to raise a JIRA and give a patch. Pls feel free to raise a JIRA with your suggestion and why you plan to change it. Regards Ram On Thu, Jun 23, 2016 at 9:36 AM, WangYQ

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there is a class named "HDFSBlockDistribution", use a tree map "hostAndWeight" to store data private Map hostAndWeight I think we can use private Map hostAndWeight to store data thanks

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Have you seen the comment above that line ? // We depend on there being only one instance of this executor running // at a time. To do concurrency, would need fencing of enable/disable of // tables. // Any time changing this maxThreads to > 1, pls see the comment at //