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

    https://github.com/apache/spark/pull/8857#discussion_r41593529
  
    --- Diff: docs/running-on-yarn.md ---
    @@ -304,6 +304,14 @@ If you need a reference to the proper location to put 
log files in the YARN so t
       </td>
     </tr>
     <tr>
    +  <td><code>spark.yarn.attemptFailuresValidityInterval</code></td>
    +  <td>-1</td>
    +  <td>
    +  Ignore the failure number which happens out the validity interval (in 
millisecond).
    --- End diff --
    
    After reading YARN-611, I think this needs a better explanation, actually. 
Something along the lines of:
    
    "Defines the validity interval for AM failure tracking. If the AM has been 
running for at least this long, the AM failure count will be reset."


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