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Comment: for hive.stats.dbclass, remove parentheses from "jdbc(:<database>)" (HIVE-6500, thanks Szehon)

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Hive 0.13 and later:  The storage that stores temporary Hive statistics. In filesystem based statistics collection ("fs"), each task writes statistics it has collected in a file on the filesystem, which will be aggregated after the job has finished. Supported values are fs (filesystem), jdbc(:<database>), <database> where <database> can be derby, mysql, etc., hbase, counter, and custom as defined in StatsSetupConst.java.

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