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

    https://github.com/apache/spark/pull/22752#discussion_r225908701
  
    --- Diff: 
core/src/main/scala/org/apache/spark/deploy/history/FsHistoryProvider.scala ---
    @@ -449,7 +450,7 @@ private[history] class FsHistoryProvider(conf: 
SparkConf, clock: Clock)
                   listing.write(info.copy(lastProcessed = newLastScanTime, 
fileSize = entry.getLen()))
                 }
     
    -            if (info.fileSize < entry.getLen()) {
    +            if (info.fileSize < entry.getLen() || 
checkAbsoluteLength(info, entry)) {
    --- End diff --
    
    Have you looked @ this getFileLength() call to see how well it updates?
     
    FwIW [HADOOP-15606](https://issues.apache.org/jira/browse/HADOOP-15606) 
proposes adding a method like this for all streams, though that proposal 
includes the need for specification and tests. Generally the HDFS team are a 
bit lax about that spec -> test workflow, which doesn't help downstream code or 
other implementations.


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