I use CDH 6.3.2 。 hive 2.1 hadoop 3.0 hive on spark 。yarn cluster 。 hive.merge.sparkfiles=true ; hive.merge.orcfile.stripe.level=true ; This configuration makes the 1099 reduce file result merge into one file when the result is small 。Then the merged file has about 1099 stripes in one file 。 Then the result is so slow when it is read. I tried hive.merge.orcfile.stripe.level=false ; The result is desirable 。One small file with one stripe and read fast 。 Can anyone tell the difference between true and false ？ Why " hive.merge.orcfile.stripe.level=true " is the default one ?
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