Hadoop QA commented on YARN-1529:

{color:red}-1 overall{color}.  Here are the results of testing the latest 
  against trunk revision 788ee35.

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-YARN-Build/6260//console

This message is automatically generated.

> Add Localization overhead metrics to NM
> ---------------------------------------
>                 Key: YARN-1529
>                 URL: https://issues.apache.org/jira/browse/YARN-1529
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: nodemanager
>            Reporter: Gera Shegalov
>            Assignee: Gera Shegalov
>         Attachments: YARN-1529.v01.patch, YARN-1529.v02.patch, 
> YARN-1529.v03.patch
> Users are often unaware of localization cost that their jobs incur. To 
> measure effectiveness of localization caches it is necessary to expose the 
> overhead in the form of metrics.
> We propose addition of the following metrics to NodeManagerMetrics.
> When a container is about to launch, its set of LocalResources has to be 
> fetched from a central location, typically on HDFS, that results in a number 
> of download requests for the files missing in caches.
> LocalizedFilesMissed: total files (requests) downloaded from DFS. Cache 
> misses.
> LocalizedFilesCached: total localization requests that were served from local 
> caches. Cache hits.
> LocalizedBytesMissed: total bytes downloaded from DFS due to cache misses.
> LocalizedBytesCached: total bytes satisfied from local caches.
> Localized(Files|Bytes)CachedRatio: percentage of localized (files|bytes) that 
> were served out of cache: ratio = 100 * caches / (caches + misses)
> LocalizationDownloadNanos: total elapsed time in nanoseconds for a container 
> to go from ResourceRequestTransition to LocalizedTransition

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