E.g task scheduler in hive is llap. https://github.com/apache/hive/blob/master/llap-tez/src/java/org/apache/hadoop/hive/llap/tezplugins/LlapTaskSchedulerService.java
https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/tez/TezSessionState.java#L289 https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/tez/TezSessionState.java#L309 (This is for Harish's point) ~Rajesh.B On Wed, Dec 21, 2016 at 7:46 AM, Harish JP <[email protected]> wrote: > Hi Dharmesh, > > TaskScheduler is not picked up via config. It has to be setup in the > TezClient using setServicePluginDescriptor. And dag/vertex execution > context should be configured to use this task scheduler. > > What you ask is very different from what TaskScheduler in Tez does. The > YarnTaskSchedulerService does not allocate containers, this is actually > done by the Yarn RM. The yarn task scheduler only allocates the Tez task to > these containers and also tries to reuse containers when possible. > > — > Thanks, > Harish > > On 21-Dec-2016, at 6:38 AM, Dharmesh Kakadia <[email protected]> wrote: > > Hi, > > I am trying to implement a new tez task scheduler which tries to allocate > tasks uniformly across nodes. As part of this, I am trying to understand > how does tez decide which scheduler to use. I could not find any > configuration, My current understanding is if its running on yarntez mode, > it will use YarnTaskSchedulerService, and if its uber mode it will use > LocalTaskSchedulerService. I m interested in using it with hive on tez. > > Please let me know what is the configuration for using a new scheduler. > > Thanks, > Dharmesh > >
