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YARN-3199. Fair Scheduler documentation improvements (Rohit Agarwal via aw)

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Allen Wittenauer 2015-02-28 11:36:15 -08:00
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hadoop-yarn-project/CHANGES.txt
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Hadoop YARN Change Log
Trunk - Unreleased
Trunk - Unreleased
INCOMPATIBLE CHANGES
@ -23,6 +23,9 @@ Trunk - Unreleased
YARN-3168. Convert site documentation from apt to markdown (Gururaj Shetty
via aw)
YARN-3199. Fair Scheduler documentation improvements (Rohit Agarwal via
aw)
OPTIMIZATIONS
BUG FIXES

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hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/FairScheduler.md
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| `yarn.scheduler.fair.locality.threshold.rack` | For applications that request containers on particular racks, the number of scheduling opportunities since the last container assignment to wait before accepting a placement on another rack. Expressed as a float between 0 and 1, which, as a fraction of the cluster size, is the number of scheduling opportunities to pass up. The default value of -1.0 means don't pass up any scheduling opportunities. |
| `yarn.scheduler.fair.allow-undeclared-pools` | If this is true, new queues can be created at application submission time, whether because they are specified as the application's queue by the submitter or because they are placed there by the user-as-default-queue property. If this is false, any time an app would be placed in a queue that is not specified in the allocations file, it is placed in the "default" queue instead. Defaults to true. If a queue placement policy is given in the allocations file, this property is ignored. |
| `yarn.scheduler.fair.update-interval-ms` | The interval at which to lock the scheduler and recalculate fair shares, recalculate demand, and check whether anything is due for preemption. Defaults to 500 ms. |
| `yarn.scheduler.increment-allocation-mb` | The fairscheduler grants memory in increments of this value. If you submit a task with resource request that is not a multiple of increment-allocation-mb, the request will be rounded up to the nearest increment. Defaults to 1024 MB. |
| `yarn.scheduler.increment-allocation-vcores` | The fairscheduler grants vcores in increments of this value. If you submit a task with resource request that is not a multiple of increment-allocation-vcores, the request will be rounded up to the nearest increment. Defaults to 1. |
###Allocation file format