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Do not route MapReduce reads and writes through non-data nodes #513

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Do not route MapReduce reads and writes through non-data nodes #513

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Commits on Jul 20, 2015

  1. Do not route MapReduce reads and writes through non-data nodes 

    This commit adds a configuration option es.nodes.data.only for managing whether or not reads using EsInputFormat and writes using
EsOutputFormat in Hadoop MapReduce jobs route through non-data nodes. The reason for wanting to avoid routing through non-data nodes is
because these nodes are usually resource-constrainted relative to data nodes. This configuration option is enabled by default.

Closes elastic#512
    @jasontedor
    jasontedor committed Jul 20, 2015
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