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What Load Do Concurrent Queries Produce On The Namenode? |
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Answer» The load Impala generates is very similar to MapReduce. Impala contacts the NameNode during the PLANNING phase to get the file metadata (this is only run on the host the QUERY was SENT to). Every impaladwill read files as part of NORMAL PROCESSING of the query. The load Impala generates is very similar to MapReduce. Impala contacts the NameNode during the planning phase to get the file metadata (this is only run on the host the query was sent to). Every impaladwill read files as part of normal processing of the query. |
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