Github user gatorsmile commented on a diff in the pull request:

    https://github.com/apache/spark/pull/15541#discussion_r84591196
  
    --- Diff: docs/configuration.md ---
    @@ -1342,6 +1342,20 @@ Apart from these, the following properties are also 
available, and may be useful
         Should be greater than or equal to 1. Number of allowed retries = this 
value - 1.
       </td>
     </tr>
    +<tr>
    +  <td><code>spark.scheduler.taskAssigner</code></td>
    +  <td>roundrobin</td>
    +  <td>
    +    The strategy of how to allocate tasks among workers with free cores. 
There are three task
    +    assigners (roundrobin, packed, and balanced) are supported currently. 
By default, roundrobin
    +    with randomness is used, which tries to allocate task to workers with 
available cores in
    +    roundrobin manner. The packed task assigner tries to allocate tasks to 
workers with the least
    +    free cores, resulting in tasks assigned to few workers, which may help 
driver to release the
    +    reserved idle workers when dynamic 
allocation(spark.dynamicAllocation.enabled) is enabled.
    +    The balanced task assigner tries to assign tasks across workers in a 
balance way (allocating
    --- End diff --
    
    `balance ` -> `balanced `


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