I was trying to benchmark some hive queries. I am using the tez execution engine. I varied the values of the following properties:
1. hive.tez.container.size 2. tez.task.resource.memory.mb 3. tez.task.resource.cpu.vcores Changes in values for property 1 is reflected properly. However it seems that hive does not respect changes in values of property 3; it always allocates one vcore per requested container (RM is configured to use the DominantResourceCalculator). This got me thinking about the precedence of property values in hive and tez. I have the following questions with respect to these configurations 1. Does hive respect the set values for the properties 2 and 3 at all? 2. If I set property 1 to a value say 2048 MB and property 2 is set to a value of say 1024 MB does this mean that I am wasting about a GB of memory for each spawned container? 3. Is there a property in hive similar to property 1 that allows me to use the 'set' command in the .hql file to specify the number of vcores to use per container? 4. Changes in value for the property tez.am.resource.cpu.vcores are reflected at runtime. However I do not observe the same behaviour with property 3. Are there other configurations that take precedence over it? Your inputs and suggestions would be highly appreciated. Thanks! PS: Tests conducted on a 5 node cluster running HDP 2.3.0
