Github user tdas commented on a diff in the pull request:
    --- Diff: 
core/src/main/scala/org/apache/spark/deploy/worker/ui/LogPage.scala ---
    @@ -115,6 +117,19 @@ private[ui] class LogPage(parent: WorkerWebUI) extends 
WebUIPage("logPage") with
         UIUtils.basicSparkPage(content, logType + " log page for " + pageName)
    +  private val fileUncompressedLengthCacheSize = parent.worker.conf.getInt(
    +  // Cache the file size, since it is expensive to compute the 
uncompressed file size.
    +  private val fileUncompressedLengthCache = CacheBuilder.newBuilder()
    +    .maximumSize(fileUncompressedLengthCacheSize)
    +    .build[String, java.lang.Long](new CacheLoader[String, 
java.lang.Long]() {
    +      override def load(path: String): java.lang.Long = {
    +        Utils.getFileLength(new File(path))
    --- End diff --
    I just learnt that CacheLoad.load has issues with obfuscating exception. So 
I think what may happen is that if Utils.getFileLength throws any exception, it 
will be wrapped and rethrown by Guava with a different stack trace, thus making 
it very confusing. I strongly suggest adding try catch here to log stuff (as 
warning) before rethrowing the same exception.

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