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From "Gera Shegalov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-1529) Add Localization overhead metrics to NM
Date Fri, 03 Jan 2014 04:22:04 GMT

     [ https://issues.apache.org/jira/browse/YARN-1529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gera Shegalov updated YARN-1529:
--------------------------------

    Attachment: YARN-1529.v02.patch

> 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
>
>
> 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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